MFS SUN LIFE SERIES TRUST
NSAR-A, 1995-08-29
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<PAGE>      PAGE  1
000 A000000 06/30/95
000 C000000 0000719269
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MFS/SUN LIFE SERIES TRUST
001 B000000 811-3732
001 C000000 6179545000
002 A000000 ONE SUN LIFE EXECUTIVE PARK
002 B000000 WELLESLEY HILLS
002 C000000 MA
002 D010000 02181
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000 16
007 C010100  1
007 C020100 CAPITAL APPRECIATION SERIES
007 C030100 N
007 C010200  2
007 C020200 CONSERVATIVE GROWTH SERIES
007 C030200 N
007 C010300  3
007 C020300 GOVERNMENT SECURITIES SERIES
007 C030300 N
007 C010400  4
007 C020400 WORLD GOVERNMENTS SERIES
007 C030400 N
007 C010500  5
007 C020500 HIGH YIELD SERIES
007 C030500 N
007 C010600  6
007 C020600 MANAGED SECTORS SERIES
007 C030600 N
007 C010700  7
007 C020700 MONEY MARKET SERIES
007 C030700 N
007 C010800  8
007 C020800 TOTAL RETURN SERIES
007 C030800 N
007 C010900  9
007 C011000 10
007 C021000 ZERO COUPON SERIES 1995
007 C031000 N
007 C011100 11
<PAGE>      PAGE  2
007 C021100 ZERO COUPON SERIES 2000
007 C031100 N
007 C011200 12
007 C021200 UTILITIES SERIES
007 C031200 N
007 C011300 13
007 C021300 WORLD GROWTH SERIES
007 C031300 N
007 C011400 14
007 C021400 RESEARCH SERIES
007 C031400 N
007 C011500 15
007 C021500 WORLD TOTAL RETURN SERIES
007 C031500 N
007 C011600 16
007 C021600 WORLD ASSET ALLOCATION SERIES
007 C031600 N
007 C011700 17
007 C021700 EMERGING GROWTH SERIES
007 C031700 N
007 C011800 18
007 C011900 19
007 C012000 20
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
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008 D02AA01 MA
008 D03AA01 02116
011 A00AA01 CLARENDON INSURANCE AGENCY
011 B00AA01 8-21590
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 SUN LIFE ANNUITY SERVICE CENTER
012 B00AA01 84-
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012 C03AA01 02103
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013 B01AA01 BOSTON
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<PAGE>      PAGE  3
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020 A000005 GOLDMAN SACHS & COMPANY
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022 A000004 GOLDMAN SACHS & COMPANY
022 B000004 13-5108880
022 C000004    586904
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022 B000005 13-5659485
022 C000005    619346
022 D000005     68754
022 A000006 HONG KONG SHANGHAI BANK
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<PAGE>      PAGE  4
022 C000006    634681
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022 B000008 94-1687665
022 C000008    449544
022 D000008      5936
022 A000009 NATIONSBANK
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
054 H000100 N
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054 J000100 Y
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<PAGE>      PAGE  8
070 C020100 N
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070 D020100 N
070 E010100 N
070 E020100 N
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070 F020100 N
070 G010100 Y
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 N
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 Y
070 N010100 N
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
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070 Q020100 N
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
075 A000100        0
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015 A000201 STATE STREET BANK & TRUST COMPANY
015 B000201 C
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015 A000202 CHASE MANHATTAN BANK, N.A.
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025 A000201 GENERAL ELECTRIC CO.
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<PAGE>      PAGE  11
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050  000200 N
051  000200 N
052  000200 N
053 A000200 N
054 A000200 Y
054 B000200 Y
054 C000200 N
054 D000200 N
054 E000200 N
054 F000200 N
054 G000200 N
054 H000200 N
054 I000200 N
054 J000200 Y
054 K000200 N
054 L000200 N
054 M000200 Y
054 N000200 N
054 O000200 N
<PAGE>      PAGE  12
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 Y
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066 A000200 Y
066 B000200 N
066 C000200 N
066 D000200 N
066 E000200 Y
066 F000200 N
066 G000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 N
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
<PAGE>      PAGE  13
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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051  000300 N
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054 E000300 N
054 F000300 N
054 G000300 N
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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015 A000401 STATE STREET BANK & TRUST COMPANY
015 B000401 C
015 C010401 BOSTON
015 C020401 MA
015 C030401 02110
015 E010401 X
015 A000402 CHASE MANHATTAN BANK, N.A.
015 B000402 S
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015 C020402 NY
015 C030402 10081
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<PAGE>      PAGE  20
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<PAGE>      PAGE  21
048 K020400 0.000
049  000400 N
050  000400 N
051  000400 N
052  000400 N
053 A000400 N
054 A000400 Y
054 B000400 Y
054 C000400 N
054 D000400 N
054 E000400 N
054 F000400 N
054 G000400 N
054 H000400 N
054 I000400 N
054 J000400 Y
054 K000400 N
054 L000400 N
054 M000400 Y
054 N000400 N
054 O000400 N
055 A000400 N
055 B000400 N
056  000400 Y
057  000400 N
058 A000400 N
059  000400 Y
060 A000400 N
060 B000400 N
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<PAGE>      PAGE  22
066 A000400 N
067  000400 N
068 A000400 N
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069  000400 N
070 A010400 Y
070 A020400 Y
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070 B020400 N
070 C010400 Y
070 C020400 Y
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070 E020400 Y
070 F010400 N
070 F020400 N
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070 G020400 Y
070 H010400 N
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
070 K010400 N
070 K020400 N
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070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
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070 Q020400 N
070 R010400 N
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<PAGE>      PAGE  23
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<PAGE>      PAGE  24
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015 A000501 STATE STREET BANK & TRUST COMPANY
015 B000501 C
015 C010501 BOSTON
015 C020501 MA
015 C030501 02110
015 E010501 X
015 A000502 CHASE MANHATTAN BANK, N.A.
015 B000502 S
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015 C030502 10081
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<PAGE>      PAGE  25
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049  000500 N
050  000500 N
051  000500 N
052  000500 N
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054 D000500 N
054 E000500 N
054 F000500 N
054 G000500 N
054 H000500 N
<PAGE>      PAGE  26
054 I000500 N
054 J000500 Y
054 K000500 N
054 L000500 N
054 M000500 Y
054 N000500 N
054 O000500 N
055 A000500 N
055 B000500 N
056  000500 Y
057  000500 N
058 A000500 N
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064 A000500 N
066 A000500 N
067  000500 N
068 A000500 N
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<PAGE>      PAGE  27
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070 G020500 N
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070 I020500 N
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070 J020500 Y
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<PAGE>      PAGE  28
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015 A000601 STATE STREET BANK & TRUST COMPANY
<PAGE>      PAGE  29
015 B000601 C
015 C010601 BOSTON
015 C020601 MA
015 C030601 02110
015 E010601 X
015 A000602 CHASE MANHATTAN BANK, N.A.
015 B000602 S
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015 C030602 10081
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<PAGE>      PAGE  30
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057  000600 N
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<PAGE>      PAGE  31
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<PAGE>      PAGE  32
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<PAGE>      PAGE  33
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015 A000701 STATE STREET BANK & TRUST COMPANY
015 B000701 C
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015 C020701 M
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<PAGE>      PAGE  34
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<PAGE>      PAGE  35
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<PAGE>      PAGE  36
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<PAGE>      PAGE  37
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<PAGE>      PAGE  38
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015 A000801 STATE STREET BANK & TRUST CO.
015 B000801 C
015 C010801 BOSTON
015 C020801 MA
015 C030801 02110
015 E010801 X
015 A000802 CHASE MANHATTAN BANK, N.A.
015 B000802 S
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015 C020802 NY
015 C030802 10081
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025 B000801 94-1671384
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025 C000804 E
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<PAGE>      PAGE  39
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048 J010800        0
<PAGE>      PAGE  40
048 J020800 0.000
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048 K020800 0.675
049  000800 N
050  000800 N
051  000800 N
052  000800 N
053 A000800 N
054 A000800 Y
054 B000800 Y
054 C000800 N
054 D000800 N
054 E000800 N
054 F000800 N
054 G000800 N
054 H000800 N
054 I000800 N
054 J000800 Y
054 K000800 N
054 L000800 N
054 M000800 Y
054 N000800 N
054 O000800 N
055 A000800 N
055 B000800 N
056  000800 Y
057  000800 N
058 A000800 N
059  000800 Y
060 A000800 Y
060 B000800 Y
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066 A000800 Y
<PAGE>      PAGE  41
066 B000800 N
066 C000800 N
066 D000800 N
066 E000800 N
066 F000800 N
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068 B000800 N
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070 A010800 Y
070 A020800 N
070 B010800 N
070 B020800 N
070 C010800 N
070 C020800 N
070 D010800 N
070 D020800 N
070 E010800 N
070 E020800 N
070 F010800 N
070 F020800 N
070 G010800 N
070 G020800 N
070 H010800 N
070 H020800 N
070 I010800 N
070 I020800 N
070 J010800 Y
070 J020800 Y
070 K010800 N
070 K020800 N
070 L010800 Y
070 L020800 Y
070 M010800 Y
070 M020800 Y
070 N010800 Y
070 N020800 N
070 O010800 Y
070 O020800 N
070 P010800 Y
070 P020800 N
070 Q010800 N
070 Q020800 N
070 R010800 N
070 R020800 N
071 A000800    453985
071 B000800    382959
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<PAGE>      PAGE  42
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<PAGE>      PAGE  43
074 P000800       83
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015 A001001 STATE STREET BANK & TRUST COMPANY
015 B001001 C
015 C011001 BOSTON
015 C021001 MA
015 C031001 02110
015 E011001 X
024  001000 N
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<PAGE>      PAGE  44
028 E031000         0
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049  001000 N
050  001000 N
051  001000 N
052  001000 N
053 A001000 N
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054 B001000 Y
054 C001000 N
054 D001000 N
054 E001000 N
054 F001000 N
054 G001000 N
054 H001000 N
054 I001000 N
<PAGE>      PAGE  45
054 J001000 Y
054 K001000 N
054 L001000 N
054 M001000 Y
054 N001000 N
054 O001000 N
055 A001000 N
055 B001000 N
056  001000 Y
057  001000 N
058 A001000 N
059  001000 Y
060 A001000 Y
060 B001000 Y
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062 P001000   0.0
062 Q001000   0.0
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063 A001000 145
063 B001000  0.0
064 A001000 N
066 A001000 N
067  001000 N
068 A001000 N
068 B001000 N
069  001000 N
070 A011000 Y
070 A021000 N
070 B011000 N
070 B021000 N
070 C011000 N
070 C021000 N
070 D011000 N
070 D021000 N
070 E011000 N
070 E021000 N
<PAGE>      PAGE  46
070 F011000 N
070 F021000 N
070 G011000 N
070 G021000 N
070 H011000 N
070 H021000 N
070 I011000 N
070 I021000 N
070 J011000 N
070 J021000 N
070 K011000 N
070 K021000 N
070 L011000 N
070 L021000 N
070 M011000 N
070 M021000 N
070 N011000 N
070 N021000 N
070 O011000 Y
070 O021000 N
070 P011000 Y
070 P021000 N
070 Q011000 N
070 Q021000 N
070 R011000 N
070 R021000 N
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<PAGE>      PAGE  47
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015 A001101 STATE STREET BANK & TRUST COMPANY
015 B001101 C
<PAGE>      PAGE  48
015 C011101 BOSTON
015 C021101 MA
015 C031101 02110
015 E011101 X
024  001100 N
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<PAGE>      PAGE  49
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050  001100 N
051  001100 N
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054 A001100 Y
054 B001100 Y
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054 D001100 N
054 E001100 N
054 F001100 N
054 G001100 N
054 H001100 N
054 I001100 N
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054 K001100 N
054 L001100 N
054 M001100 Y
054 N001100 N
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055 B001100 N
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057  001100 N
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<PAGE>      PAGE  50
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070 D021100 N
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070 F011100 N
070 F021100 N
070 G011100 N
070 G021100 N
070 H011100 N
070 H021100 N
070 I011100 N
070 I021100 N
070 J011100 N
070 J021100 N
070 K011100 N
070 K021100 N
070 L011100 N
070 L021100 N
070 M011100 N
070 M021100 N
070 N011100 N
070 N021100 N
070 O011100 Y
070 O021100 N
070 P011100 Y
070 P021100 N
070 Q011100 N
070 Q021100 N
070 R011100 N
070 R021100 N
<PAGE>      PAGE  51
071 A001100         0
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<PAGE>      PAGE  52
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015 A001201 STATE STREET BANK & TRUST COMPANY
015 B001201 C
015 C011201 BOSTON
015 C021201 MA
015 C031201 02110
015 E011201 X
024  001200 N
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<PAGE>      PAGE  53
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054 E001200 N
054 F001200 N
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054 H001200 N
054 I001200 N
054 J001200 Y
<PAGE>      PAGE  54
054 K001200 N
054 L001200 N
054 M001200 Y
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066 D001200 N
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068 A001200 N
068 B001200 N
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070 B011200 N
070 B021200 N
070 C011200 N
070 C021200 N
070 D011200 N
070 D021200 N
<PAGE>      PAGE  55
070 E011200 N
070 E021200 N
070 F011200 N
070 F021200 N
070 G011200 N
070 G021200 N
070 H011200 N
070 H021200 N
070 I011200 N
070 I021200 N
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070 J021200 Y
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070 K021200 N
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070 L021200 Y
070 M011200 Y
070 M021200 Y
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070 O021200 N
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070 Q011200 N
070 Q021200 N
070 R011200 N
070 R021200 N
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<PAGE>      PAGE  56
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<PAGE>      PAGE  57
015 A001301 STATE STREET BANK & TRUST COMPANY
015 B001301 C
015 C011301 BOSTON
015 C021301 MA
015 C031301 02110
015 E011301 X
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015 B001302 S
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015 C021302 NY
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015 E041302 X
024  001300 Y
025 A001301 LEHMAN BROTHERS HOLDINGS
025 B001301 13-2518466
025 C001301 E
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<PAGE>      PAGE  58
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048 G021300 0.000
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048 I011300        0
048 I021300 0.000
048 J011300        0
048 J021300 0.000
048 K011300        0
048 K021300 0.000
049  001300 N
050  001300 N
051  001300 N
052  001300 N
053 A001300 N
054 A001300 Y
054 B001300 Y
054 C001300 N
054 D001300 N
054 E001300 N
054 F001300 N
054 G001300 N
054 H001300 N
054 I001300 N
054 J001300 Y
054 K001300 N
054 L001300 N
054 M001300 Y
054 N001300 N
054 O001300 N
055 A001300 N
055 B001300 N
056  001300 Y
<PAGE>      PAGE  59
057  001300 N
058 A001300 N
059  001300 Y
060 A001300 N
060 B001300 N
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066 A001300 Y
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066 D001300 N
066 E001300 N
066 F001300 N
066 G001300 N
067  001300 N
068 A001300 N
068 B001300 Y
069  001300 N
070 A011300 Y
070 A021300 N
070 B011300 Y
070 B021300 N
070 C011300 Y
070 C021300 N
070 D011300 Y
070 D021300 N
070 E011300 Y
070 E021300 N
070 F011300 Y
070 F021300 N
070 G011300 Y
070 G021300 N
070 H011300 Y
070 H021300 N
<PAGE>      PAGE  60
070 I011300 N
070 I021300 N
070 J011300 Y
070 J021300 Y
070 K011300 Y
070 K021300 N
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070 L021300 Y
070 M011300 Y
070 M021300 Y
070 N011300 Y
070 N021300 N
070 O011300 Y
070 O021300 N
070 P011300 Y
070 P021300 N
070 Q011300 N
070 Q021300 N
070 R011300 N
070 R021300 N
071 A001300     95140
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<PAGE>      PAGE  61
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015 A001401 STATE STREET BANK AND TRUST COMPANY
015 B001401 C
015 C011401 BOSTON
015 C021401 MA
015 C031401 02110
015 E011401 X
015 A001402 CHASE MANHATTAN BANK, N.A.
015 B001402 S
<PAGE>      PAGE  62
015 C011402 NEW YORK
015 C021402 NY
015 C031402 10081
015 E041402 X
024  001400 N
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<PAGE>      PAGE  63
048 G021400 0.000
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049  001400 N
050  001400 N
051  001400 N
052  001400 N
053 A001400 Y
053 B001400 Y
054 A001400 Y
054 B001400 Y
054 C001400 N
054 D001400 N
054 E001400 N
054 F001400 N
054 G001400 N
054 H001400 N
054 I001400 N
054 J001400 Y
054 K001400 N
054 L001400 N
054 M001400 Y
054 N001400 N
054 O001400 N
055 A001400 N
055 B001400 N
056  001400 Y
057  001400 N
058 A001400 N
059  001400 Y
060 A001400 Y
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<PAGE>      PAGE  64
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066 A001400 Y
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066 E001400 N
066 F001400 N
066 G001400 N
067  001400 N
068 A001400 N
068 B001400 N
069  001400 N
070 A011400 Y
070 A021400 N
070 B011400 Y
070 B021400 N
070 C011400 N
070 C021400 N
070 D011400 Y
070 D021400 N
070 E011400 N
070 E021400 N
070 F011400 N
070 F021400 N
070 G011400 N
070 G021400 N
070 H011400 N
070 H021400 N
070 I011400 N
070 I021400 N
070 J011400 Y
070 J021400 N
070 K011400 Y
070 K021400 N
070 L011400 Y
070 L021400 Y
070 M011400 Y
070 M021400 Y
070 N011400 N
070 N021400 N
070 O011400 Y
070 O021400 N
070 P011400 Y
070 P021400 N
070 Q011400 N
070 Q021400 N
<PAGE>      PAGE  65
070 R011400 N
070 R021400 N
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<PAGE>      PAGE  66
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015 A001501 STATE STREET BANK AND TRUST COMPANY
015 B001501 C
015 C011501 BOSTON
015 C021501 MA
015 C031501 02110
015 E011501 X
015 A001502 CHASE MANHATTAN BANK, N.A.
015 B001502 S
015 C011502 NEW YORK
015 C021502 NY
015 C031502 10020
015 E041502 X
024  001500 Y
025 A001501 GENERAL ELECTRIC CO.
025 B001501 06-1109503
025 C001501 E
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<PAGE>      PAGE  67
028 A031500         0
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<PAGE>      PAGE  68
048 K011500   300000
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049  001500 N
050  001500 N
051  001500 N
052  001500 N
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053 C001500 N
054 A001500 Y
054 B001500 Y
054 C001500 N
054 D001500 N
054 E001500 N
054 F001500 N
054 G001500 N
054 H001500 N
054 I001500 N
054 J001500 Y
054 K001500 N
054 L001500 N
054 M001500 Y
054 N001500 N
054 O001500 N
055 A001500 N
055 B001500 N
056  001500 Y
057  001500 N
058 A001500 N
059  001500 Y
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<PAGE>      PAGE  69
066 A001500 Y
066 B001500 N
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066 G001500 N
067  001500 N
068 A001500 N
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069  001500 N
070 A011500 Y
070 A021500 N
070 B011500 Y
070 B021500 N
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070 G021500 Y
070 H011500 Y
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070 I011500 N
070 I021500 N
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070 J021500 Y
070 K011500 Y
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070 M021500 Y
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070 O021500 N
070 P011500 Y
070 P021500 N
070 Q011500 N
070 Q021500 N
070 R011500 N
070 R021500 N
071 A001500      4855
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<PAGE>      PAGE  70
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<PAGE>      PAGE  71
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015 A001601 STATE STREET BANK AND TRUST COMPANY
015 B001601 C
015 C011601 BOSTON
015 C021601 MA
015 C031601 02110
015 E011601 X
024  001600 N
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<PAGE>      PAGE  72
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049  001600 N
050  001600 N
051  001600 N
052  001600 N
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054 A001600 Y
054 B001600 N
054 C001600 N
054 D001600 N
054 E001600 N
054 F001600 N
054 G001600 N
054 H001600 N
054 I001600 N
054 J001600 Y
054 K001600 N
054 L001600 N
054 M001600 Y
054 N001600 N
<PAGE>      PAGE  73
054 O001600 N
055 A001600 N
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057  001600 N
058 A001600 N
059  001600 Y
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066 A001600 Y
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066 F001600 N
066 G001600 N
067  001600 N
068 A001600 N
068 B001600 N
069  001600 N
070 A011600 Y
070 A021600 N
070 B011600 Y
070 B021600 N
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070 C021600 N
070 D011600 Y
070 D021600 N
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070 E021600 N
070 F011600 Y
070 F021600 N
<PAGE>      PAGE  74
070 G011600 Y
070 G021600 Y
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070 I011600 N
070 I021600 N
070 J011600 Y
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070 K011600 Y
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070 L011600 Y
070 L021600 Y
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070 M021600 Y
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070 O021600 N
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070 Q021600 N
070 R011600 N
070 R021600 N
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<PAGE>      PAGE  75
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015 A001701 STATE STREET BANK AND TRUST COMPANY
015 B001701 C
015 C011701 BOSTON
015 C021701 MA
<PAGE>      PAGE  76
015 C031701 02110
015 E011701 X
015 A001702 CHASE MANHATTAN BANK, N.A.
015 B001702 S
015 C011702 NEW YORK
015 C021702 NY
015 C031702 10020
015 E041702 X
024  001700 N
028 A011700         0
028 A021700         0
028 A031700         0
028 A041700         0
028 B011700         0
028 B021700         0
028 B031700         0
028 B041700         0
028 C011700         0
028 C021700         0
028 C031700         0
028 C041700         0
028 D011700         0
028 D021700         0
028 D031700         0
028 D041700         0
028 E011700      4727
028 E021700         0
028 E031700         0
028 E041700        11
028 F011700      6821
028 F021700         0
028 F031700         0
028 F041700        23
028 G011700     11548
028 G021700         0
028 G031700         0
028 G041700        34
028 H001700         0
054 A001700 Y
054 B001700 N
054 C001700 N
054 D001700 N
054 E001700 N
054 F001700 N
054 G001700 N
054 H001700 N
054 I001700 N
054 J001700 Y
054 K001700 N
054 L001700 N
054 M001700 Y
<PAGE>      PAGE  77
054 N001700 N
054 O001700 N
058 A001700 N
059  001700 Y
060 A001700 N
060 B001700 N
061  001700      300
062 A001700 N
062 B001700   0.0
062 C001700   0.0
062 D001700   0.0
062 E001700   0.0
062 F001700   0.0
062 G001700   0.0
062 H001700   0.0
062 I001700   0.0
062 J001700   0.0
062 K001700   0.0
062 L001700   0.0
062 M001700   0.0
062 N001700   0.0
062 O001700   0.0
062 P001700   0.0
062 Q001700   0.0
062 R001700   0.0
066 A001700 Y
066 B001700 N
066 C001700 Y
066 D001700 N
066 E001700 N
066 F001700 N
066 G001700 N
067  001700 N
068 A001700 N
068 B001700 N
069  001700 N
070 A011700 Y
070 A021700 N
070 B011700 Y
070 B021700 N
070 C011700 N
070 C021700 N
070 D011700 Y
070 D021700 N
070 E011700 N
070 E021700 N
070 F011700 Y
070 F021700 N
070 G011700 N
070 G021700 N
070 H011700 Y
<PAGE>      PAGE  78
070 H021700 N
070 I011700 N
070 I021700 N
070 J011700 Y
070 J021700 N
070 K011700 Y
070 K021700 N
070 L011700 Y
070 L021700 N
070 M011700 Y
070 M021700 N
070 N011700 Y
070 N021700 N
070 O011700 Y
070 O021700 N
070 P011700 Y
070 P021700 N
070 Q011700 N
070 Q021700 N
070 R011700 N
070 R021700 N
071 A001700      8047
071 B001700        15
071 C001700      2909
071 D001700    1
072 A001700  6
072 B001700       25
072 C001700        0
072 D001700        0
072 E001700        0
072 F001700        6
072 G001700        0
072 H001700        0
072 I001700        0
072 J001700        1
072 K001700        0
072 L001700        0
072 M001700        1
072 N001700        5
072 O001700        0
072 P001700        0
072 Q001700        0
072 R001700        4
072 S001700        1
072 T001700        0
072 U001700        0
072 V001700        0
072 W001700        1
072 X001700       18
072 Y001700        6
072 Z001700       13
<PAGE>      PAGE  79
072AA001700        2
072BB001700        0
072CC011700      151
072CC021700        0
072DD011700        0
072DD021700        0
072EE001700        0
073 A011700   0.0000
073 A021700   0.0000
073 B001700   0.0000
073 C001700   0.0000
074 A001700      221
074 B001700        0
074 C001700     3941
074 D001700        0
074 E001700        0
074 F001700     8184
074 G001700        0
074 H001700        0
074 I001700        0
074 J001700        3
074 K001700      187
074 L001700        0
074 M001700        0
074 N001700    12536
074 O001700      845
074 P001700        0
074 Q001700        0
074 R011700        0
074 R021700        0
074 R031700        0
074 R041700       12
074 S001700        0
074 T001700    11679
074 U011700     1115
074 U021700        0
074 V011700    10.48
074 V021700     0.00
074 W001700   0.0000
074 X001700        0
074 Y001700        0
075 A001700        0
075 B001700     4952
076  001700     0.00
SIGNATURE   JAMES O. YOST                                
TITLE       ASSISTANT TREASURER 
 

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - CAPITAL APPRECIATION SERIES AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .001
   <NAME> MFS/SUN LIFE SERIES TRUST - CAPITAL APPRECIATION SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 547,039,065
<INVESTMENTS-AT-VALUE>                654,816,533
<RECEIVABLES>                           4,078,977
<ASSETS-OTHER>                             10,335
<OTHER-ITEMS-ASSETS>                        8,249
<TOTAL-ASSETS>                        658,914,094
<PAYABLE-FOR-SECURITIES>                7,216,270
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 666,342
<TOTAL-LIABILITIES>                     7,882,612
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              516,908,755
<SHARES-COMMON-STOCK>                  22,862,757
<SHARES-COMMON-PRIOR>                  19,522,903
<ACCUMULATED-NII-CURRENT>                 999,213
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                25,464,568
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>              107,658,946
<NET-ASSETS>                          651,031,482
<DIVIDEND-INCOME>                       3,261,281
<INTEREST-INCOME>                         698,977
<OTHER-INCOME>                            (30,242)
<EXPENSES-NET>                          2,308,204
<NET-INVESTMENT-INCOME>                 1,621,812
<REALIZED-GAINS-CURRENT>               25,330,252
<APPREC-INCREASE-CURRENT>              76,057,333
<NET-CHANGE-FROM-OPS>                 103,009,397
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>               1,257,607
<DISTRIBUTIONS-OF-GAINS>               13,684,251
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 6,142,904
<NUMBER-OF-SHARES-REDEEMED>             3,378,401
<SHARES-REINVESTED>                       575,351
<NET-CHANGE-IN-ASSETS>                174,523,700
<ACCUMULATED-NII-PRIOR>                   635,008
<ACCUMULATED-GAINS-PRIOR>              13,818,567
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                   2,099,923
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                         2,308,204
<AVERAGE-NET-ASSETS>                  562,119,542
<PER-SHARE-NAV-BEGIN>                     24.4076
<PER-SHARE-NII>                            0.0760
<PER-SHARE-GAIN-APPREC>                    4.6670
<PER-SHARE-DIVIDEND>                       0.0568
<PER-SHARE-DISTRIBUTIONS>                  0.6182
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       28.4756
<EXPENSE-RATIO>                              0.83
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        


















































</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - CONSERVATIVE GROWTH SERIES AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .002
   <NAME> MFS/SUN LIFE SERIES TRUST - CONSERVATIVE GROWTH SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 179,399,197
<INVESTMENTS-AT-VALUE>                201,545,160
<RECEIVABLES>                           1,274,832
<ASSETS-OTHER>                             15,361
<OTHER-ITEMS-ASSETS>                       32,811
<TOTAL-ASSETS>                        202,868,164
<PAYABLE-FOR-SECURITIES>                   44,350
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  36,893
<TOTAL-LIABILITIES>                        81,243
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              173,764,907
<SHARES-COMMON-STOCK>                  10,720,597
<SHARES-COMMON-PRIOR>                   9,134,387
<ACCUMULATED-NII-CURRENT>               2,132,733
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                 4,742,467
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>               22,146,814
<NET-ASSETS>                          202,786,921
<DIVIDEND-INCOME>                       2,204,382
<INTEREST-INCOME>                         416,988
<OTHER-INCOME>                            (10,141)
<EXPENSES-NET>                            544,105
<NET-INVESTMENT-INCOME>                 2,067,124
<REALIZED-GAINS-CURRENT>                5,168,064
<APPREC-INCREASE-CURRENT>              21,391,198
<NET-CHANGE-FROM-OPS>                  28,626,386
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>               2,990,858
<DISTRIBUTIONS-OF-GAINS>                1,805,444
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,751,839
<NUMBER-OF-SHARES-REDEEMED>               433,131
<SHARES-REINVESTED>                       267,502
<NET-CHANGE-IN-ASSETS>                 52,469,121
<ACCUMULATED-NII-PRIOR>                 3,056,467
<ACCUMULATED-GAINS-PRIOR>               1,379,847
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                     474,236
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           544,105
<AVERAGE-NET-ASSETS>                  173,151,346
<PER-SHARE-NAV-BEGIN>                     16.4563
<PER-SHARE-NII>                            0.2115
<PER-SHARE-GAIN-APPREC>                    2.7349
<PER-SHARE-DIVIDEND>                       0.3037
<PER-SHARE-DISTRIBUTIONS>                  0.1834
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       18.9156
<EXPENSE-RATIO>                              0.63
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - GOVERNMENT SECURITIES SERIES AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .003
   <NAME> MFS/SUN LIFE SERIES TRUST - GOVERNMENT SECURITIES SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 316,490,919
<INVESTMENTS-AT-VALUE>                325,657,828
<RECEIVABLES>                          16,188,366
<ASSETS-OTHER>                              4,791
<OTHER-ITEMS-ASSETS>                          398
<TOTAL-ASSETS>                        341,851,383
<PAYABLE-FOR-SECURITIES>               19,059,375
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 322,271
<TOTAL-LIABILITIES>                    19,381,646
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              310,955,323
<SHARES-COMMON-STOCK>                  25,618,636
<SHARES-COMMON-PRIOR>                  28,638,373
<ACCUMULATED-NII-CURRENT>              11,301,034
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                         0
<OVERDISTRIBUTION-GAINS>                8,953,529
<ACCUM-APPREC-OR-DEPREC>                9,166,909
<NET-ASSETS>                          322,469,737
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                      12,336,541
<OTHER-INCOME>                                  0
<EXPENSES-NET>                          1,034,886
<NET-INVESTMENT-INCOME>                11,301,655
<REALIZED-GAINS-CURRENT>               (1,816,435)
<APPREC-INCREASE-CURRENT>              24,345,102
<NET-CHANGE-FROM-OPS>                  33,830,322
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>              19,677,831
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,597,780
<NUMBER-OF-SHARES-REDEEMED>             6,254,608
<SHARES-REINVESTED>                     1,637,091
<NET-CHANGE-IN-ASSETS>                (24,680,369)
<ACCUMULATED-NII-PRIOR>                19,677,210
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>              7,137,094
<GROSS-ADVISORY-FEES>                     922,958
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                         1,034,886
<AVERAGE-NET-ASSETS>                  337,582,792
<PER-SHARE-NAV-BEGIN>                     12.1219
<PER-SHARE-NII>                            0.4168
<PER-SHARE-GAIN-APPREC>                    0.8299
<PER-SHARE-DIVIDEND>                       0.0000
<PER-SHARE-DISTRIBUTIONS>                  0.7813
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       12.5873
<EXPENSE-RATIO>                              0.62
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - WORLD GOVERNMENTS SERIES AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .004
   <NAME> MFS/SUN LIFE SERIES TRUST - WORLD GOVERNMENTS SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 150,792,247
<INVESTMENTS-AT-VALUE>                156,774,540
<RECEIVABLES>                           4,507,311
<ASSETS-OTHER>                              1,887
<OTHER-ITEMS-ASSETS>                      123,227
<TOTAL-ASSETS>                        161,406,965
<PAYABLE-FOR-SECURITIES>                        0
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>               3,750,445
<TOTAL-LIABILITIES>                     3,750,445
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              141,791,528
<SHARES-COMMON-STOCK>                  12,984,298
<SHARES-COMMON-PRIOR>                  12,231,369
<ACCUMULATED-NII-CURRENT>               4,371,246
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                 6,457,676
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                5,036,070
<NET-ASSETS>                          157,656,520
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                       5,684,843
<OTHER-INCOME>                                  0
<EXPENSES-NET>                            656,694
<NET-INVESTMENT-INCOME>                 5,028,149
<REALIZED-GAINS-CURRENT>                5,016,084
<APPREC-INCREASE-CURRENT>               7,246,371
<NET-CHANGE-FROM-OPS>                  17,290,604
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                       0
<DISTRIBUTIONS-OF-GAINS>                7,960,375
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,516,637
<NUMBER-OF-SHARES-REDEEMED>             1,431,525
<SHARES-REINVESTED>                       667,817
<NET-CHANGE-IN-ASSETS>                 18,501,613
<ACCUMULATED-NII-PRIOR>                         0
<ACCUMULATED-GAINS-PRIOR>               9,401,967
<OVERDISTRIB-NII-PRIOR>                   656,903
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                     555,034
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           656,694
<AVERAGE-NET-ASSETS>                  148,720,556
<PER-SHARE-NAV-BEGIN>                     11.3769
<PER-SHARE-NII>                            0.4676
<PER-SHARE-GAIN-APPREC>                    0.9421
<PER-SHARE-DIVIDEND>                       0.0000
<PER-SHARE-DISTRIBUTIONS>                  0.6445
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       12.1421
<EXPENSE-RATIO>                              0.89
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - HIGH YIELD SERIES AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER>.005
   <NAME> MFS/SUN LIFE SERIES TRUST -HIGH YIELD SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 131,419,232
<INVESTMENTS-AT-VALUE>                131,213,851
<RECEIVABLES>                           3,090,311
<ASSETS-OTHER>                              1,409
<OTHER-ITEMS-ASSETS>                       70,709
<TOTAL-ASSETS>                        134,376,280
<PAYABLE-FOR-SECURITIES>                3,143,350
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 229,540
<TOTAL-LIABILITIES>                     3,372,890
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              136,111,165
<SHARES-COMMON-STOCK>                  15,606,959
<SHARES-COMMON-PRIOR>                  12,483,980
<ACCUMULATED-NII-CURRENT>               4,469,960
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                         0
<OVERDISTRIBUTION-GAINS>                9,372,354
<ACCUM-APPREC-OR-DEPREC>                 (205,381)
<NET-ASSETS>                          131,003,390
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                       6,180,164
<OTHER-INCOME>                                  0
<EXPENSES-NET>                            521,708
<NET-INVESTMENT-INCOME>                 5,658,456
<REALIZED-GAINS-CURRENT>               (2,120,831)
<APPREC-INCREASE-CURRENT>               8,127,352
<NET-CHANGE-FROM-OPS>                  11,664,977
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>               8,657,037
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 5,617,275
<NUMBER-OF-SHARES-REDEEMED>             3,552,613
<SHARES-REINVESTED>                     1,058,317
<NET-CHANGE-IN-ASSETS>                 28,809,537
<ACCUMULATED-NII-PRIOR>                 7,468,541
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>              7,251,523
<GROSS-ADVISORY-FEES>                     454,021
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           521,708
<AVERAGE-NET-ASSETS>                  121,528,200
<PER-SHARE-NAV-BEGIN>                      8.1860
<PER-SHARE-NII>                            0.3885
<PER-SHARE-GAIN-APPREC>                    0.4217
<PER-SHARE-DIVIDEND>                       0.6023
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                        8.3939
<EXPENSE-RATIO>                              0.87
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - MANAGED SECTORS SERIES AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .006
   <NAME> MFS/SUN LIFE SERIES TRUST - MANAGED SECTORS SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 144,412,529
<INVESTMENTS-AT-VALUE>                164,039,912
<RECEIVABLES>                           1,565,676
<ASSETS-OTHER>                              1,641
<OTHER-ITEMS-ASSETS>                      723,924
<TOTAL-ASSETS>                        166,331,153
<PAYABLE-FOR-SECURITIES>                4,466,109
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  39,680
<TOTAL-LIABILITIES>                     4,505,789
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              131,515,686
<SHARES-COMMON-STOCK>                   6,885,223
<SHARES-COMMON-PRIOR>                   5,984,570
<ACCUMULATED-NII-CURRENT>                 425,773
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                10,256,298
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>               19,627,607
<NET-ASSETS>                          161,825,364
<DIVIDEND-INCOME>                         727,744
<INTEREST-INCOME>                         275,484
<OTHER-INCOME>                            ( 5,300)
<EXPENSES-NET>                            572,144
<NET-INVESTMENT-INCOME>                   425,784
<REALIZED-GAINS-CURRENT>               11,178,635
<APPREC-INCREASE-CURRENT>              16,103,101
<NET-CHANGE-FROM-OPS>                  27,707,520
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                 342,457
<DISTRIBUTIONS-OF-GAINS>                4,215,692
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,298,558
<NUMBER-OF-SHARES-REDEEMED>               608,930
<SHARES-REINVESTED>                       211,025
<NET-CHANGE-IN-ASSETS>                 42,838,291
<ACCUMULATED-NII-PRIOR>                   342,446
<ACCUMULATED-GAINS-PRIOR>               3,293,355
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                     515,102
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           572,144
<AVERAGE-NET-ASSETS>                  137,912,339
<PER-SHARE-NAV-BEGIN>                     19.8823
<PER-SHARE-NII>                            0.0667
<PER-SHARE-GAIN-APPREC>                    4.2757
<PER-SHARE-DIVIDEND>                       0.0542
<PER-SHARE-DISTRIBUTIONS>                  0.6672
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       23.5033
<EXPENSE-RATIO>                              0.84
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - MONEY MARKET SERIES AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES> .007
   <NUMBER>
   <NAME> MFS/SUN LIFE SERIES TRUST - MONEY MARKET SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 245,386,300
<INVESTMENTS-AT-VALUE>                245,386,300
<RECEIVABLES>                          16,366,126
<ASSETS-OTHER>                              4,491
<OTHER-ITEMS-ASSETS>                      173,724
<TOTAL-ASSETS>                        261,930,641
<PAYABLE-FOR-SECURITIES>                        0
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                       0
<TOTAL-LIABILITIES>                       197,688
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              261,732,953
<SHARES-COMMON-STOCK>                 261,732,953
<SHARES-COMMON-PRIOR>                 252,174,992
<ACCUMULATED-NII-CURRENT>                       0
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                         0
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                        0
<NET-ASSETS>                          261,732,953
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                       6,376,478
<OTHER-INCOME>                                  0
<EXPENSES-NET>                            612,161
<NET-INVESTMENT-INCOME>                 5,764,317
<REALIZED-GAINS-CURRENT>                        0
<APPREC-INCREASE-CURRENT>                       0
<NET-CHANGE-FROM-OPS>                   5,764,317
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>               5,764,317
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>               201,388,780
<NUMBER-OF-SHARES-REDEEMED>           197,595,136
<SHARES-REINVESTED>                     5,764,317
<NET-CHANGE-IN-ASSETS>                  9,557,961
<ACCUMULATED-NII-PRIOR>                         0
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                     531,839
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           612,161
<AVERAGE-NET-ASSETS>                  214,336,691
<PER-SHARE-NAV-BEGIN>                      1.0000
<PER-SHARE-NII>                            0.0259
<PER-SHARE-GAIN-APPREC>                    0.0000
<PER-SHARE-DIVIDEND>                       0.0259
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                        1.0000
<EXPENSE-RATIO>                              0.58
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - TOTAL RETURN SERIES AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .008
   <NAME> MFS/SUN LIFE SERIES TRUST - TOTAL RETURN SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 829,654,656
<INVESTMENTS-AT-VALUE>                932,782,642
<RECEIVABLES>                          34,841,195
<ASSETS-OTHER>                             11,581
<OTHER-ITEMS-ASSETS>                       58,183
<TOTAL-ASSETS>                        967,693,601
<PAYABLE-FOR-SECURITIES>               13,789,949
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 198,154
<TOTAL-LIABILITIES>                    13,988,103
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              830,926,805
<SHARES-COMMON-STOCK>                  57,507,737
<SHARES-COMMON-PRIOR>                  55,654,402
<ACCUMULATED-NII-CURRENT>              22,136,754
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                         0
<OVERDISTRIBUTION-GAINS>                2,486,671
<ACCUM-APPREC-OR-DEPREC>              103,128,610
<NET-ASSETS>                          953,705,498
<DIVIDEND-INCOME>                       9,884,505
<INTEREST-INCOME>                      15,654,312
<OTHER-INCOME>                            (93,652)
<EXPENSES-NET>                          3,308,384
<NET-INVESTMENT-INCOME>                22,136,781
<REALIZED-GAINS-CURRENT>                2,269,875
<APPREC-INCREASE-CURRENT>              94,734,469
<NET-CHANGE-FROM-OPS>                 119,141,125
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>              34,941,362
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 3,588,136
<NUMBER-OF-SHARES-REDEEMED>             3,947,680
<SHARES-REINVESTED>                     2,212,879
<NET-CHANGE-IN-ASSETS>                114,091,148
<ACCUMULATED-NII-PRIOR>                34,941,335
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>              4,756,546
<GROSS-ADVISORY-FEES>                   3,088,243
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                         3,308,384
<AVERAGE-NET-ASSETS>                  886,227,924
<PER-SHARE-NAV-BEGIN>                     15.0862
<PER-SHARE-NII>                            0.3955
<PER-SHARE-GAIN-APPREC>                    1.7388
<PER-SHARE-DIVIDEND>                       0.6365
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       16.5840
<EXPENSE-RATIO>                              0.75
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - ZERO COUPON SERIES - 1995 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> 10
   <NAME> MFS/SUNLIFE SERIES TRUST - ZERO COUPON SERIES - 1995
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                   5,271,053   
<INVESTMENTS-AT-VALUE>                  5,322,148   
<RECEIVABLES>                                   0   
<ASSETS-OTHER>                                 67   
<OTHER-ITEMS-ASSETS>                       54,176   
<TOTAL-ASSETS>                          5,376,391   
<PAYABLE-FOR-SECURITIES>                        0   
<SENIOR-LONG-TERM-DEBT>                         0   
<OTHER-ITEMS-LIABILITIES>                   4,874   
<TOTAL-LIABILITIES>                         4,874   
<SENIOR-EQUITY>                                 0   
<PAID-IN-CAPITAL-COMMON>                5,134,000   
<SHARES-COMMON-STOCK>                     555,360   
<SHARES-COMMON-PRIOR>                     478,278   
<ACCUMULATED-NII-CURRENT>                 184,326   
<OVERDISTRIBUTION-NII>                          0   
<ACCUMULATED-NET-GAINS>                     2,096   
<OVERDISTRIBUTION-GAINS>                        0   
<ACCUM-APPREC-OR-DEPREC>                   51,095   
<NET-ASSETS>                            5,371,517   
<DIVIDEND-INCOME>                               0   
<INTEREST-INCOME>                         195,409   
<OTHER-INCOME>                                  0   
<EXPENSES-NET>                             11,082   
<NET-INVESTMENT-INCOME>                   184,327   
<REALIZED-GAINS-CURRENT>                    2,464   
<APPREC-INCREASE-CURRENT>                  (3,047)  
<NET-CHANGE-FROM-OPS>                     183,744   
<EQUALIZATION>                                  0   
<DISTRIBUTIONS-OF-INCOME>                 370,375   
<DISTRIBUTIONS-OF-GAINS>                   27,473   
<DISTRIBUTIONS-OTHER>                           0   
<NUMBER-OF-SHARES-SOLD>                    56,327   
<NUMBER-OF-SHARES-REDEEMED>                20,779   
<SHARES-REINVESTED>                        41,534   
<NET-CHANGE-IN-ASSETS>                    514,910   
<ACCUMULATED-NII-PRIOR>                   370,374   
<ACCUMULATED-GAINS-PRIOR>                  27,105   
<OVERDISTRIB-NII-PRIOR>                         0   
<OVERDIST-NET-GAINS-PRIOR>                      0   
<GROSS-ADVISORY-FEES>                       6,236   
<INTEREST-EXPENSE>                              0   
<GROSS-EXPENSE>                            11,082   
<AVERAGE-NET-ASSETS>                    5,014,166   
<PER-SHARE-NAV-BEGIN>                     10.1544   
<PER-SHARE-NII>                            0.3663   
<PER-SHARE-GAIN-APPREC>                    0.0051   
<PER-SHARE-DIVIDEND>                       0.7947   
<PER-SHARE-DISTRIBUTIONS>                  0.0590   
<RETURNS-OF-CAPITAL>                       0.0000   
<PER-SHARE-NAV-END>                        9.6721   
<EXPENSE-RATIO>                              0.45   
<AVG-DEBT-OUTSTANDING>                          0   
<AVG-DEBT-PER-SHARE>                            0   
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - ZERO COUPON SERIES - 2000 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .011
   <NAME> MFS/SUN LIFE SERIES TRUST - ZERO COUPON SERIES - 2000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                   2,727,954   
<INVESTMENTS-AT-VALUE>                  2,894,014   
<RECEIVABLES>                               3,903   
<ASSETS-OTHER>                                 45   
<OTHER-ITEMS-ASSETS>                      104,419   
<TOTAL-ASSETS>                          3,002,381   
<PAYABLE-FOR-SECURITIES>                        0   
<SENIOR-LONG-TERM-DEBT>                         0   
<OTHER-ITEMS-LIABILITIES>                   3,848   
<TOTAL-LIABILITIES>                         3,848   
<SENIOR-EQUITY>                                 0   
<PAID-IN-CAPITAL-COMMON>                2,808,430   
<SHARES-COMMON-STOCK>                     348,788   
<SHARES-COMMON-PRIOR>                     412,231   
<ACCUMULATED-NII-CURRENT>                  87,227   
<OVERDISTRIBUTION-NII>                          0   
<ACCUMULATED-NET-GAINS>                         0   
<OVERDISTRIBUTION-GAINS>                   63,184   
<ACCUM-APPREC-OR-DEPREC>                  166,060   
<NET-ASSETS>                            2,998,533   
<DIVIDEND-INCOME>                               0   
<INTEREST-INCOME>                          95,070   
<OTHER-INCOME>                                  0   
<EXPENSES-NET>                              8,143   
<NET-INVESTMENT-INCOME>                    86,927   
<REALIZED-GAINS-CURRENT>                  (25,136)  
<APPREC-INCREASE-CURRENT>                 366,292   
<NET-CHANGE-FROM-OPS>                     428,083   
<EQUALIZATION>                                  0   
<DISTRIBUTIONS-OF-INCOME>                 173,697   
<DISTRIBUTIONS-OF-GAINS>                        0   
<DISTRIBUTIONS-OTHER>                           0   
<NUMBER-OF-SHARES-SOLD>                     8,201   
<NUMBER-OF-SHARES-REDEEMED>                92,983   
<SHARES-REINVESTED>                        21,339   
<NET-CHANGE-IN-ASSETS>                   (281,720)  
<ACCUMULATED-NII-PRIOR>                   173,997   
<ACCUMULATED-GAINS-PRIOR>                       0   
<OVERDISTRIB-NII-PRIOR>                         0   
<OVERDIST-NET-GAINS-PRIOR>                 38,048   
<GROSS-ADVISORY-FEES>                       4,072   
<INTEREST-EXPENSE>                              0   
<GROSS-EXPENSE>                             8,143   
<AVERAGE-NET-ASSETS>                    3,275,332   
<PER-SHARE-NAV-BEGIN>                      7.9573   
<PER-SHARE-NII>                            0.2207   
<PER-SHARE-GAIN-APPREC>                    0.8522   
<PER-SHARE-DIVIDEND>                       0.4332   
<PER-SHARE-DISTRIBUTIONS>                  0.0000   
<RETURNS-OF-CAPITAL>                       0.0000   
<PER-SHARE-NAV-END>                        8.5970   
<EXPENSE-RATIO>                              0.50   
<AVG-DEBT-OUTSTANDING>                          0   
<AVG-DEBT-PER-SHARE>                            0   
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - UTILITIES SERIES IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .012
   <NAME> MFS/SUN LIFE SERIES TRUST - UTILITIES SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                  26,194,440
<INVESTMENTS-AT-VALUE>                 27,892,534
<RECEIVABLES>                             687,316
<ASSETS-OTHER>                              2,425
<OTHER-ITEMS-ASSETS>                       84,277
<TOTAL-ASSETS>                         28,666,552
<PAYABLE-FOR-SECURITIES>                  648,612
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  67,539
<TOTAL-LIABILITIES>                       716,151
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>               26,255,250
<SHARES-COMMON-STOCK>                   2,684,814
<SHARES-COMMON-PRIOR>                   2,252,765
<ACCUMULATED-NII-CURRENT>                 614,798
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                         0
<OVERDISTRIBUTION-GAINS>                  617,840
<ACCUM-APPREC-OR-DEPREC>                1,698,193
<NET-ASSETS>                           27,950,401
<DIVIDEND-INCOME>                         435,672
<INTEREST-INCOME>                         214,833
<OTHER-INCOME>                            (11,111)
<EXPENSES-NET>                             24,157
<NET-INVESTMENT-INCOME>                   615,237
<REALIZED-GAINS-CURRENT>                    4,642
<APPREC-INCREASE-CURRENT>               2,283,619
<NET-CHANGE-FROM-OPS>                   2,903,498
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                 673,961
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                   925,227
<NUMBER-OF-SHARES-REDEEMED>               561,950
<SHARES-REINVESTED>                        68,772
<NET-CHANGE-IN-ASSETS>                  6,502,049
<ACCUMULATED-NII-PRIOR>                   673,522
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                622,482
<GROSS-ADVISORY-FEES>                      90,551
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           114,708
<AVERAGE-NET-ASSETS>                   24,346,990
<PER-SHARE-NAV-BEGIN>                      9.5209
<PER-SHARE-NII>                            0.2503
<PER-SHARE-GAIN-APPREC>                    0.9120
<PER-SHARE-DIVIDEND>                       0.2726
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       10.4106
<EXPENSE-RATIO>                              0.20
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - WORLD GROWTH SERIES AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .013
   <NAME> MFS/SUN LIFE SERIES TRUST - WORLD GROWTH SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                 116,878,934
<INVESTMENTS-AT-VALUE>                118,555,848
<RECEIVABLES>                           4,788,571
<ASSETS-OTHER>                              1,370
<OTHER-ITEMS-ASSETS>                      128,305
<TOTAL-ASSETS>                        123,474,094
<PAYABLE-FOR-SECURITIES>                2,878,875
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 147,594
<TOTAL-LIABILITIES>                     3,026,469
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>              116,629,835
<SHARES-COMMON-STOCK>                  10,749,631
<SHARES-COMMON-PRIOR>                   9,142,775
<ACCUMULATED-NII-CURRENT>                 549,228
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                 1,644,102
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                1,624,460
<NET-ASSETS>                          120,447,625
<DIVIDEND-INCOME>                         656,667
<INTEREST-INCOME>                         540,279
<OTHER-INCOME>                            (80,006)
<EXPENSES-NET>                            560,670
<NET-INVESTMENT-INCOME>                   556,270
<REALIZED-GAINS-CURRENT>                2,059,058
<APPREC-INCREASE-CURRENT>               3,737,535
<NET-CHANGE-FROM-OPS>                   6,352,863
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>               1,411,794
<DISTRIBUTIONS-OF-GAINS>                1,739,413
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 2,358,694
<NUMBER-OF-SHARES-REDEEMED>             1,043,077
<SHARES-REINVESTED>                       291,239
<NET-CHANGE-IN-ASSETS>                 20,403,461
<ACCUMULATED-NII-PRIOR>                 1,404,752
<ACCUMULATED-GAINS-PRIOR>               1,324,457
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                     488,356
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                           560,670
<AVERAGE-NET-ASSETS>                  109,017,305
<PER-SHARE-NAV-BEGIN>                     10.9425
<PER-SHARE-NII>                            0.0552
<PER-SHARE-GAIN-APPREC>                    0.5109
<PER-SHARE-DIVIDEND>                       0.1361
<PER-SHARE-DISTRIBUTIONS>                  0.1677
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       11.2048
<EXPENSE-RATIO>                              1.04
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - RESEARCH SERIES AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .014
   <NAME> MFS/SUN LIFE SERIES TRUST - RESEARCH SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                  20,729,416
<INVESTMENTS-AT-VALUE>                 22,469,537
<RECEIVABLES>                           1,053,368
<ASSETS-OTHER>                                 45
<OTHER-ITEMS-ASSETS>                       83,154
<TOTAL-ASSETS>                         23,606,104
<PAYABLE-FOR-SECURITIES>                  740,233
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  14,987
<TOTAL-LIABILITIES>                       755,220
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>               20,775,665
<SHARES-COMMON-STOCK>                   1,983,483
<SHARES-COMMON-PRIOR>                     391,744
<ACCUMULATED-NII-CURRENT>                 114,457
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                   220,582
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                1,740,180
<NET-ASSETS>                           22,850,884
<DIVIDEND-INCOME>                          76,721
<INTEREST-INCOME>                          56,029
<OTHER-INCOME>                             (1,171)
<EXPENSES-NET>                             17,046
<NET-INVESTMENT-INCOME>                   114,533
<REALIZED-GAINS-CURRENT>                  235,919
<APPREC-INCREASE-CURRENT>               1,725,014
<NET-CHANGE-FROM-OPS>                   2,075,466
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                   5,213
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,815,750
<NUMBER-OF-SHARES-REDEEMED>               224,496
<SHARES-REINVESTED>                           485
<NET-CHANGE-IN-ASSETS>                 18,981,970
<ACCUMULATED-NII-PRIOR>                     5,137
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                 15,337
<GROSS-ADVISORY-FEES>                      44,910
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                            61,956
<AVERAGE-NET-ASSETS>                   12,075,208
<PER-SHARE-NAV-BEGIN>                      9.8761
<PER-SHARE-NII>                            0.1011
<PER-SHARE-GAIN-APPREC>                    1.5470
<PER-SHARE-DIVIDEND>                       0.0036
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       11.5206
<EXPENSE-RATIO>                              0.28
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - WORLD TOTAL RETURN SERIES AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .015
   <NAME> MFS/SUN LIFE SERIES TRUST - WORLD TOTAL RETURN
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                   5,913,103
<INVESTMENTS-AT-VALUE>                  6,113,549
<RECEIVABLES>                             159,375
<ASSETS-OTHER>                                 19
<OTHER-ITEMS-ASSETS>                       41,377
<TOTAL-ASSETS>                          6,314,320
<PAYABLE-FOR-SECURITIES>                   54,618
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  58,315
<TOTAL-LIABILITIES>                       112,933
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>                5,883,692
<SHARES-COMMON-STOCK>                     565,441
<SHARES-COMMON-PRIOR>                     137,844
<ACCUMULATED-NII-CURRENT>                  85,311
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                    46,622
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                  185,762
<NET-ASSETS>                            6,201,387
<DIVIDEND-INCOME>                          36,555
<INTEREST-INCOME>                          59,562
<OTHER-INCOME>                             (2,073)
<EXPENSES-NET>                              9,743
<NET-INVESTMENT-INCOME>                    84,301
<REALIZED-GAINS-CURRENT>                   49,897
<APPREC-INCREASE-CURRENT>                 181,656
<NET-CHANGE-FROM-OPS>                     315,854
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                   2,399
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                   495,629
<NUMBER-OF-SHARES-REDEEMED>                68,254
<SHARES-REINVESTED>                           222
<NET-CHANGE-IN-ASSETS>                  4,817,358
<ACCUMULATED-NII-PRIOR>                     3,409
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                  3,275
<GROSS-ADVISORY-FEES>                      13,124
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                            22,867
<AVERAGE-NET-ASSETS>                    3,528,769
<PER-SHARE-NAV-BEGIN>                     10.0405
<PER-SHARE-NII>                            0.2513
<PER-SHARE-GAIN-APPREC>                    0.6815
<PER-SHARE-DIVIDEND>                       0.0060
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       10.9673
<EXPENSE-RATIO>                              0.56
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - WORLD ASSET ALLOCATION SERIES AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .016
   <NAME> MFS/SUN LIFE SERIES TRUST - WORLD ASSET ALLOCATION SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                  13,191,849
<INVESTMENTS-AT-VALUE>                 13,666,369
<RECEIVABLES>                             289,833
<ASSETS-OTHER>                                 37
<OTHER-ITEMS-ASSETS>                       88,771
<TOTAL-ASSETS>                         14,045,010
<PAYABLE-FOR-SECURITIES>                  274,050
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                 174,285
<TOTAL-LIABILITIES>                       448,335
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>               12,749,242
<SHARES-COMMON-STOCK>                   1,226,196
<SHARES-COMMON-PRIOR>                     298,587
<ACCUMULATED-NII-CURRENT>                 170,615
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                   312,007
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                  364,811
<NET-ASSETS>                           13,596,675
<DIVIDEND-INCOME>                          50,603
<INTEREST-INCOME>                         136,760
<OTHER-INCOME>                                  0
<EXPENSES-NET>                             17,234
<NET-INVESTMENT-INCOME>                   170,129
<REALIZED-GAINS-CURRENT>                  316,893
<APPREC-INCREASE-CURRENT>                 348,810
<NET-CHANGE-FROM-OPS>                     835,832
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                   6,089
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                   976,693
<NUMBER-OF-SHARES-REDEEMED>                49,657
<SHARES-REINVESTED>                           573
<NET-CHANGE-IN-ASSETS>                 10,593,500
<ACCUMULATED-NII-PRIOR>                     6,575
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                  4,886
<GROSS-ADVISORY-FEES>                      27,110
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                            44,344
<AVERAGE-NET-ASSETS>                    7,289,221
<PER-SHARE-NAV-BEGIN>                     10.0579
<PER-SHARE-NII>                            0.2432
<PER-SHARE-GAIN-APPREC>                    0.7948
<PER-SHARE-DIVIDEND>                       0.0074
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       11.0885
<EXPENSE-RATIO>                              0.48
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS/SUN LIFE
SERIES TRUST - EMERGING GROWTH SERIES AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
   <NUMBER> .017
   <NAME> MFS/SUN LIFE SERIES TRUST - EMERGING GROWTH SERIES
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                   DEC-31-1995
<PERIOD-END>                        JUN-30-1995
<INVESTMENTS-AT-COST>                  11,974,791
<INVESTMENTS-AT-VALUE>                 12,125,318
<RECEIVABLES>                             189,863
<ASSETS-OTHER>                                  0
<OTHER-ITEMS-ASSETS>                      220,973
<TOTAL-ASSETS>                         12,536,154
<PAYABLE-FOR-SECURITIES>                  845,306
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                  11,657
<TOTAL-LIABILITIES>                       856,963
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>               11,514,150
<SHARES-COMMON-STOCK>                   1,114,646
<SHARES-COMMON-PRIOR>                           0
<ACCUMULATED-NII-CURRENT>                  12,956
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                     1,558
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                  150,527
<NET-ASSETS>                           11,679,191
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                          24,613
<OTHER-INCOME>                                  0
<EXPENSES-NET>                             11,657
<NET-INVESTMENT-INCOME>                    12,956
<REALIZED-GAINS-CURRENT>                    1,558
<APPREC-INCREASE-CURRENT>                 150,527
<NET-CHANGE-FROM-OPS>                     165,041
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                       0
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                 1,117,930
<NUMBER-OF-SHARES-REDEEMED>                 3,284
<SHARES-REINVESTED>                             0
<NET-CHANGE-IN-ASSETS>                 11,679,191
<ACCUMULATED-NII-PRIOR>                         0
<ACCUMULATED-GAINS-PRIOR>                       0
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                       6,207
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                            17,864
<AVERAGE-NET-ASSETS>                    4,952,017
<PER-SHARE-NAV-BEGIN>                     10.0000
<PER-SHARE-NII>                            0.0173
<PER-SHARE-GAIN-APPREC>                    0.4606
<PER-SHARE-DIVIDEND>                       0.0000
<PER-SHARE-DISTRIBUTIONS>                  0.0000
<RETURNS-OF-CAPITAL>                       0.0000
<PER-SHARE-NAV-END>                       10.4779
<EXPENSE-RATIO>                              1.41
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                            0
        

</TABLE>


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