<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
The schedule contains summary financial information extracted from Dean
Witter Cornerstone Fund III and is qualified in its entirety by reference
to such financial statements.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> SEP-30-2000
<CASH> 26,584,379
<SECURITIES> 0
<RECEIVABLES> 125,667<F1>
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 0
<DEPRECIATION> 0
<TOTAL-ASSETS> 25,730,867<F2>
<CURRENT-LIABILITIES> 0
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 0
<TOTAL-LIABILITY-AND-EQUITY> 25,730,867<F3>
<SALES> 0
<TOTAL-REVENUES> (2,277,703)<F4>
<CGS> 0
<TOTAL-COSTS> 0
<OTHER-EXPENSES> 2,197,433
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> (4,475,136)
<INCOME-TAX> 0
<INCOME-CONTINUING> (4,475,136)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (4,475,136)
<EPS-BASIC> 0
<EPS-DILUTED> 0
<FN>
<F1>Receivables include interest receivable of $108,322 and due from
DWR of $17,345.
<F2>In addition to cash and receivables, total assets include net
unrealized loss on open contracts of $(882,615) and net option
premiums of $(96,564).
<F3>Liabilities include redemptions payable of $423,823, accrued management
fees of $84,965 and accrued administrative expenses of $156,464.
<F4>Total revenues include realized trading revenue of $(995,629), net
change in unrealized of $(2,308,226) and interest income of $1,026,152.
</FN>
</TABLE>
