DREYFUS THIRD CENTURY FUND INC
N-30D, 1999-02-04
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YEAR 2000 ISSUES (UNAUDITED)

  The  fund  could  be  adversely  affected  if the computer systems used by The
Dreyfus  Corporation  and  the  fund' s  other service providers do not properly
process  and  calculate date-related information from and after January 1, 2000.
The  Dreyfus  Corporation  is working to avoid Year 2000-related problems in its
systems  and  to  obtain  assurances  from other service providers that they are
taking  similar  steps.  In  addition,  issuers  of securities in which the fund
invests may be adversely affected by Year 2000-related problems. This could have
an impact on the value of the fund's investments and its share price.

THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Investor:

  It  is my pleasure to introduce Paul A. Hilton, who recently became co-manager
of The Dreyfus Third Century Fund, Inc., sharing management duties with Maceo K.
Sloan  of  NCM  Capital  Management  Group, Inc., who selects securities for the
Fund.  Paul  supervises  the  areas  of social and environmental concern for the
portfolio.

  Prior  to  joining  Dreyfus,  Paul Hilton was a research analyst in the Social
Awareness  Investment  program  at  Smith Barney Asset Management, a division of
Travelers  Group.  He  also  had  similar  responsibilities  at  the Council for
Economic Priorities, a not-for-profit organization that is based in New York and
is best known for its consumer guide, "Shopping for a Better World."

  Paul  holds  a  BA  in  public  affairs  from Syracuse University and an MA in
cultural  anthropology  from  New  York  University.  We  believe  that  Paul is
eminently  qualified to help The Dreyfus Third Century Fund, Inc. live up to its
charter   in   the   areas   of   social   and   environmental  responsibility.

               Sincerely,



               [Stephen E. Canter signature]


               Stephen E. Canter

               Chief Investment Officer

               The Dreyfus Corporation

December 18, 1998

New York, N.Y.


THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Shareholder:

  We  are  pleased  to  provide you with this semi-annual report for The Dreyfus
Third  Century Fund, Inc. for the six-month period ended November 30, 1998. Over
this  period, your Fund produced a total return of 7.22%,* which compares with a
total  return of 7.48% for the Standard & Poor's 500 Composite Stock Price Index
(the  "S& P  500  Index" ) and 3.37% for the Dow Jones Industrial Average.** The
six-month  period was indeed an unsettling one for investors as market sentiment
gyrated wildly from extreme bullishness to extreme bearishness.

  The  panic  in the stock market in August was widespread and no sector escaped
unscathed. Small capitalization stocks, however, declined the most. Although the
Fund' s  performance  also  suffered  in  August,  our  strategy of investing in
reasonably  priced,  large  and  liquid  growth  stocks with consistent earnings
helped  to  protect the Fund from a more severe decline during the month. By the
end  of  November,  the  Fund' s year-to-date performance was back into positive
territory  following  an  impressive recovery in the stock market in October and
November after the Federal Reserve Board (Fed) cut interest rates.

Economic Review

  During  1998,  the  main  regions  of  the  world  had very different economic
fundamentals.  The  U.S.  began  the  period  with  a  strong  economy near full
employment, with unemployment only slightly above 4%. The tight labor market led
the  Federal  Reserve to contemplate a rise in interest rates early in the year.
The  U.S.  economy  cooled  enough over the months that the Fed decided to stand
pat.  Evidence of economic cooling continued to accumulate and worries about the
world  economy  intensified. Financial stresses pushed the Fed to ease beginning
in  September.  After  many  years of subpar economic growth, continental Europe
moved  into  a  sustained  economic  expansion.  The  overall  European  economy
benefited  as  interest  rates  in  peripheral countries such as Spain and Italy
fell,  approaching  the  lower  levels  established  by  Germany,  on the eve of
currency unification. Unlike the U.S., Europe has substantial excess capacity of
productive  plants and labor. In Asia, weak economies were pervasive as a result
of  the  Asian  financial  crisis.  The Latin American economies weakened as the
financial stresses spread throughout that region.

  A  main  influence  on  the  U.S.  economy this year was the foreign financial
crisis  and cooling of the world economy. The positive effects hit first. Actual
inflation  and  expected  inflation  dropped,  causing  a  decline  in long-term
Treasury bond yields and mortgage rates. This caused a boom in housing. The drop
in inflation helped the consumer sector as more of the growth in consumer income
was  left  over  after  inflation to buy goods and services. Consumers benefited
from a combination of good growth in real income, a strong labor market and past
increases in the prices of assets they owned.

  The  negative  effect of Asian weakness was felt in the industrial sector more
than  the  consumer  sector.  Corporate  profits weakened, especially in sectors
affected  by  the Asian crisis such as world-traded commodities (oil, metals and
paper) and exports. One result of the industrial weakness was to cool off a U.S.
economy    that    had    been    growing    rapidly.

  The  major  change  in  the  economic  outlook  over  recent months has been a
downward  shift  in  expectations  for  world  economic  growth. A credit crunch
developed in emerging countries and former communist countries, sharply reducing
the  economic  outlook  for  Asia  and  Latin  America  as well as for commodity
exporting  countries throughout the world. The effect on Europe and the U.S. has
been to lower expectations of profit growth and drive down bond yields. Monetary
policy has begun to ease in both the U.S. and Europe.

  Evidence  of  a  weaker  world  economy  accumulated as the financial stresses
continued.  A  worsened financial crisis occurred between the Russian default in
mid-August  and  the  fallout  from  the Long-Term Capital Management hedge fund
crisis  through  early October. However, proactive steps were taken to stabilize
the  Japanese  banks,  design  a  support  package  for Brazil and ease monetary
policy.  There  appears to be a shift in the priorities of key policymakers from
fighting potential inflation to restimulating future world economic growth.

Market Overview

  The  six months ended November 30, 1998 encompassed some very different market
phases.  There  was  stock  market strength during the early part of the period.
Small-cap  indices  had  already  started  to erode and were joined by large-cap
indices  by midsummer. A sharp decline until the end of August was followed by a
rebound  and then a renewed decline amid financial fears until early October. In
the  last  two  months  there  was  a  strong rally in response to the easing of
monetary  policy.  Returns  on  mid-cap and small-cap stock indices tended to be
weaker than for large caps, with a negative total return on small-cap indices.

  Three  key  trends  influenced stock market behavior during the fiscal period.
First, the Federal Reserve continued to keep the Federal Funds rate flat at 5.5%
until  late  September,  but  then  began  a succession of easing moves. Second,
weakness in emerging country economies contributed to declining commodity prices
and  a  drop  in  long-term  Treasury  bond  yields  to multidecade lows. Third,
expectations  for  corporate  profits dropped, first in the sectors sensitive to
Asian developments and then for a broader list of stocks.

  The  trigger  for  the  sharp  decline  in stocks in August appeared to be the
Russian default in the summer of 1998. This resulted in deepening concerns about
weaker  economic  growth  and  corporate profits. There was also a global margin
call on risky assets held by hedge funds and financial institutions. This raised
the  cost  of  debt financing for many corporations and many emerging countries.
Expectations  for  economic  activity  in  emerging  countries in Asia and Latin
America  shifted  down  sharply  while  expectations  for U.S. corporate profits
weakened  somewhat.  Despite  the fall in Treasury bond yields, financial stocks
led  the summer selloff due to concerns about financial contagion among emerging
countries  and  potential loan losses by financial institutions. However, in the
last  two  months  of the fiscal period, these fears began to ebb in response to
Federal Reserve easing moves.

  The  erosion  of expectations about corporate profit growth over the last year
contributed to an outperformance by a small group of super-cap growth stocks for
much  of  the  fiscal  year.  Investors  had more confidence in the prospect for
strong  persistent  earnings  growth for this small group of stocks than for the
broad  market.  Value  stocks,  which often have greater cyclical sensitivity to
earnings  fluctuations,  lagged  behind  these super-growth stocks. In addition,
many  of  the financial stocks that fall into the value category dropped sharply
following the Russian default and global margin call concerns, before rebounding
after the Fed acted.

Portfolio Focus

  Our  sector  allocation  during the volatile six-month reporting period was an
important strategy for the Fund. As a result of the global economic problems, we
initiated  defensive  strategies  in the third quarter to protect the portfolio.
The  most  important  strategy  was  reducing  our  exposure  in sectors that we
believed  exhibited  the  highest  sensitivity  to  a  slowing  world  economy.
Accordingly, the Energy sector allocation was reduced because of weak oil prices
due  to  excess  supply and OPEC's inability to enforce production quotas on its
members.  The  Capital Goods sector was underweighted because of our expectation
that capital expenditure for industrial goods would slow. A number of the Fund's
holdings  including Honeywell, EVI Weatherford, Fort James and Schlumberger were
either  reduced  or  eliminated  from  the  portfolio  to accomplish our goal of
reducing exposure to economic and commodity sensitive sectors.

  The  sectors  that  were  the biggest contributors to the portfolio's positive
performance  were  Communication Services, Consumer Staples and Health Care. The
Technology group also performed well, particularly in the last two months of the
reporting  period.  Some  of the best performing stocks were Sun Microsystems up
85%, Cisco Systems up 49%, Eli Lilly & Co. up 47% and Safeway up 44%.

  Our  biggest  mistake  during  the  six-month  period  was  overweighting  the
financial  sector  and  poor  stock  selection  in  the  group.  The hardest hit
categories  were  the  large  money  center  banks,  smaller  regional banks and
specialty  finance companies. Citigroup declined 17% over the six months because
of  concerns  about profits in its global business and uncertainty regarding the
success   of  merging  its  Travelers  and  Citibank  units  into  one  seamless
organization. Conseco, on the other hand, performed poorly because of fears that
a  flatter  yield  curve  in  the U.S. credit market would negatively affect the
company's profitability. While the yield curve has steepened recently, the stock
has  not  yet  recovered  fully  from its depressed level. We remain positive on
Conseco,  for  now,  given  the  attractive  relative valuation of the stock. In
response  to  the  poor performance of the financial stocks in the portfolio, we
have  added two high quality stocks, Marsh & McLennan and Franklin Resources, to
the  portfolio. We believe the long-term prospects for these two stocks are very
good because of their exposure to the asset management business.

  Our  Global  Growth  strategic  theme,  which  emphasizes  large multinational
companies  in  the  portfolio,  has  been  a  leading  driver  of  good relative
performance  in  the  past.  However,  due  to what we believe to be a temporary
slowdown  in  global economies, we have de-emphasized this strategic theme. Many
large  multinational  growth  companies including Gillette, Disney and Coca-Cola
warned  Wall  Street  in  the  third  quarter that they would not meet consensus
estimates  due  to a deterioration in global demand for their products. While we
believe  these  companies  are  attractively  positioned  to  participate in the
secular  growth  of  worldwide economies, in the short term their profit margins
will contract as consumption on a global basis slows.

  In  place  of  the globally oriented companies we have emphasized domestically
oriented  companies  in  the portfolio. Some of our recent purchases include CVS
and  Costco  Cos.  This  tactical  move  simply  represents a weighting shift we
believe  better  responds to current economic conditions. Our long-term strategy
with regard to global companies is still in place and will be re-emphasized when
the  cyclical forces hampering the growth of the global companies in the current
environment abate.

Social Investment Review

  The  Fund  invests  in  companies  that  show evidence that they conduct their
business  in a manner that contributes to the enhancement of the quality of life
in  America.  To  assess whether a company contributes to the quality of life in
America,  we  employ  a rigorous research process to evaluate companies based on
their  records  in the areas of environment, employee safety, product safety and
equal  employment opportunity. Our analysis includes information provided by the
companies  themselves,  the media, and research from respected social investment
research   providers   such  as  Kinder,  Lydenberg  and  Domini,  the  Investor
Responsibility Research Center, and Environmental Information Services.

  We  are  currently  upgrading  the  environmental  research we receive, with a
special  emphasis  on  intra-industry  comparisons  of  corporate  environmental
performance.   This  research  will  allow  us  to  identify  "best  in  class"
environmental   records   in   a  particular  industry,  rather  than  eliminate
historically problematic sectors entirely from the Fund.

We communicate with companies in our portfolio, and encourage them to focus on
their  performance in our areas of social concern. We recently participated in a
dialogue   training  seminar  with  CERES,  the  Coalition  for  Environmentally
Responsible  Economies,  a leading environmental organization that developed the
CERES  Principles  (formerly  the Valdez Principles) for companies. By endorsing
the   Principles,   companies   commit  to  an  ongoing  process  of  continuous
environmental  improvement,  dialogue,  and  comprehensive  public reporting. We
intend  to  participate  in  the next few months as a member of a CERES dialogue
team    with    one    of   the   companies   in   the   Fund'  s   portfolio.

  The  Fund  also  intends  to  invest in a $100,000 federally insured community
investment  certificate  of  deposit  through Self-Help, a credit union based in
Durham,  North  Carolina.  Through  the  backing  of institutions like the Fund,
Self-Help  is  able  to  provide small-business and home mortgage loans to North
Carolinians  who  might  not  otherwise qualify for capital. Through this unique
investment  vehicle,  we  can secure a competitive rate of return, while helping
the  same  community  in  which  the  Fund's sub-investment adviser, NCM Capital
Management Group, Inc., is based.

                                  Sincerely,



            [Paul A. Hilton signature]    [Maceo K. Sloan signature]


            Paul A. Hilton                Maceo K. Sloan

            Co-Portfolio Manager          Co-Portfolio Manager

            The Dreyfus Corporation       NCM Capital Management Group, Inc.

December 18, 1998

New York, N.Y.

* Total return includes reinvestment of dividends and any capital gains paid.

**SOURCE:  LIPPER  ANALYTICAL  SERVICES,  INC. -- Reflects the reinvestment of
income  dividends  and,  where  applicable, capital gain distributions. Both the
Standard  & Poor' s 500 Composite Stock Price Index and the Dow Jones Industrial
Average are widely accepted unmanaged indices of U.S. stock market performance.


<TABLE>
<CAPTION>
THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                                                                         NOVEMBER 30, 1998 (UNAUDITED)

Common Stocks--98.7%                                                                                Shares          Value
- -------------------------------------------------------                                          _____________   _____________
<S>                                                                                                   <C>         <C>
            Consumer Durables--.8%  Newell     . . . . . . . . . . . . . . . . . . . . . .            170,200     $  7,531,350

                                                                                                                 _____________


       Consumer Non-Durables--9.6%  Clorox     . . . . . . . . . . . . . . . . . . . . . .            216,100        24,000,600

                                    Coca-Cola  . . . . . . . . . . . . . . . . . . . . . .            163,900        11,483,244

                                    Hershey Foods  . . . . . . . . . . . . . . . . . . . .            295,600        19,879,100

                                    Jones Apparel Group  . . . . . . . . . . . . . . . (a)            400,000         9,275,000

                                    PepsiCo  . . . . . . . . . . . . . . . . . . . . . . .            265,800        10,283,138

                                    Procter & Gamble . . . . . . . . . . . . . . . . . . .            207,900        18,217,238

                                                                                                                  _____________

                                                                                                                     93,138,320

                                                                                                                  _____________


           Consumer Services--2.0%  Fox Entertainment Group, Cl. A . . . . . . . . . . . .             65,400         1,545,075

                                    Service Corp. International  . . . . . . . . . . . . .            276,000        10,315,500

                                    Tele-Communications,Cl. A, Liberty Media . . . . . (a)            195,000         7,860,938

                                                                                                                  _____________

                                                                                                                     19,721,513

                                                                                                                  _____________


      Electronic Technology--15.0%  Cisco Systems  . . . . . . . . . . . . . . . . . . (a)            308,550        23,256,956

                                    Compaq Computer  . . . . . . . . . . . . . . . . . . .            637,900        20,731,750

                                    Intel  . . . . . . . . . . . . . . . . . . . . . . . .            143,500        15,444,188

                                    Linear Technology  . . . . . . . . . . . . . . . . . .            208,900        14,636,056

                                    Lucent Technologies  . . . . . . . . . . . . . . . . .            213,000        18,331,313

                                    Sun Microsystems . . . . . . . . . . . . . . . . . (a)            386,800        28,647,375

                                    Tellabs    . . . . . . . . . . . . . . . . . . . . (a)            435,900        23,565,844

                                                                                                                  _____________

                                                                                                                    144,613,482

                                                                                                                  _____________


                      Energy--1.0%  British Petroleum, A.D.S.  . . . . . . . . . . . . . .            101,600         9,359,900

                                                                                                                  _____________


                    Finance--14.9%  Allstate . . . . . . . . . . . . . . . . . . . . . . .            523,400        21,328,550

                                    American International Group . . . . . . . . . . . . .            306,450        28,806,300

                                    BankAmerica  . . . . . . . . . . . . . . . . . . . . .            253,817        16,545,696

                                    Citigroup  . . . . . . . . . . . . . . . . . . . . . .            246,300        12,361,181

                                    Conseco  . . . . . . . . . . . . . . . . . . . . . . .            200,000         6,625,000

                                    Federal National Mortgage Association  . . . . . . . .            360,800        26,248,200

                                    Franklin Resources . . . . . . . . . . . . . . . . . .            205,200         8,772,300

                                    Marsh & McLennan . . . . . . . . . . . . . . . . . . .            136,600         7,948,413

                                    Nationwide Financial Services, Cl. A . . . . . . . . .            150,900         7,262,063

                                    Summit Bancorp . . . . . . . . . . . . . . . . . . . .            190,000         7,944,375

                                                                                                                  _____________

                                                                                                                    143,842,078

                                                                                                                  _____________


             Health Services--2.9%  Cardinal Health  . . . . . . . . . . . . . . . . . . .            258,450        17,736,131

                                    HBO & Co.  . . . . . . . . . . . . . . . . . . . . . .            419,400        10,458,788

                                                                                                                  _____________

                                                                                                                     28,194,919

                                                                                                                  _____________


          Health Technology--15.5%  Amgen  . . . . . . . . . . . . . . . . . . . . . . . .            103,600         7,795,900

                                    Bristol-Myers Squibb . . . . . . . . . . . . . . . . .            254,400        31,179,900

                                    Guidant  . . . . . . . . . . . . . . . . . . . . . . .            132,800        11,395,900

                                    Johnson & Johnson  . . . . . . . . . . . . . . . . . .            192,000        15,600,000

                                    Lilly (Eli)  . . . . . . . . . . . . . . . . . . . . .            184,800        16,574,250

                                    Medtronic  . . . . . . . . . . . . . . . . . . . . . .            269,200        18,221,475

                                    Merck & Co.  . . . . . . . . . . . . . . . . . . . . .            227,000        35,156,625

THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS (CONTINUED)                                                             NOVEMBER 30, 1998 (UNAUDITED)


Common Stocks (continued)                                                                           Shares          Value
- -------------------------------------------------------                                          _____________   _____________

     Health Technology (continued)  Schering-Plough  . . . . . . . . . . . . . . . . . . .            125,400     $  13,339,425

                                                                                                                  _____________

                                                                                                                    149,263,475

                                                                                                                  _____________


          Process Industries--2.0%  Avery Dennison . . . . . . . . . . . . . . . . . . . .            229,900        11,020,831

                                    Bemis  . . . . . . . . . . . . . . . . . . . . . . . .            229,700         8,685,531

                                                                                                                  _____________

                                                                                                                     19,706,362

                                                                                                                  _____________


      Producer Manufacturing--4.0%  Illinois Tool Works  . . . . . . . . . . . . . . . . .            278,100        17,676,731

                                    Pitney Bowes . . . . . . . . . . . . . . . . . . . . .            207,400        11,614,400

                                    Tyco International . . . . . . . . . . . . . . . . . .            139,000         9,147,938

                                                                                                                  _____________

                                                                                                                     38,439,069

                                                                                                                  _____________


               Retail Trade--10.8%  Costco Cos.  . . . . . . . . . . . . . . . . . . . (a)            125,000         7,843,750

                                    CVS  . . . . . . . . . . . . . . . . . . . . . . . . .            162,000         7,998,750

                                    Home Depot . . . . . . . . . . . . . . . . . . . . . .            702,800        34,964,300

                                    Safeway  . . . . . . . . . . . . . . . . . . . . . (a)            510,600        26,966,063

                                    Wal-Mart Stores  . . . . . . . . . . . . . . . . . . .            351,800        26,494,938

                                                                                                                  _____________

                                                                                                                    104,267,801

                                                                                                                  _____________


        Technology Services--10.3%  Automatic Data Processing  . . . . . . . . . . . . . .            163,400        12,581,800

                                    BMC Software . . . . . . . . . . . . . . . . . . . (a)            191,800         9,793,788

                                    Computer Associates International  . . . . . . . . . .            414,150        18,326,138

                                    IMS Health . . . . . . . . . . . . . . . . . . . . . .            240,400        15,956,550

                                    Microsoft  . . . . . . . . . . . . . . . . . . . . (a)            160,300        19,556,600

                                    Oracle     . . . . . . . . . . . . . . . . . . . . (a)            674,400        23,098,200
                                                                                                                  _____________

                                                                                                                     99,313,076
                                                                                                                  _____________

              Transportation--1.3%  Southwest Airlines . . . . . . . . . . . . . . . . . .            585,300        12,583,950
                                                                                                                  _____________


                   Utilities--8.6%  AES  . . . . . . . . . . . . . . . . . . . . . . . . .            420,100        19,219,575

                                    Airtouch Communications  . . . . . . . . . . . . . (a)            203,100        11,614,781

                                    Ameritech  . . . . . . . . . . . . . . . . . . . . . .            191,900        10,386,588

                                    Bell Atlantic  . . . . . . . . . . . . . . . . . . . .            296,600        16,498,375

                                    Enron  . . . . . . . . . . . . . . . . . . . . . . . .            165,800         8,714,863

                                    MCI WorldCom . . . . . . . . . . . . . . . . . . . . .            275,897        16,277,923
                                                                                                                  _____________

                                                                                                                     82,712,105
                                                                                                                  _____________


                      TOTAL COMMON STOCKS

                                        (cost $667,440,856)  . . . . . . . . . . . . . . .                         $952,687,400
                                                                                                                  _____________




THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS (CONTINUED)                                                              NOVEMBER 30, 1998 (UNAUDITED)

                                                                                                  Principal
Short-Term Investments--2.1%                                                                       Amount            Value
- -------------------------------------------------------                                         _____________     _____________

              U.S. Treasury Bills:  4.30%, 12/24/1998  . . . . . . . . . . . . . . . . . .    $       313,000     $     312,111

                                    4.15%, 12/31/1998  . . . . . . . . . . . . . . . . . .            427,000           425,429

                                    4.46%, 1/21/1999 . . . . . . . . . . . . . . . . . . .          8,690,000         8,635,427

                                    4.17%, 1/28/1999 . . . . . . . . . . . . . . . . . . .          6,692,000         6,645,290

                                    4.32%, 2/4/1999  . . . . . . . . . . . . . . . . . . .          4,306,000         4,271,767
                                                                                                                  _____________


                      TOTAL SHORT-TERM INVESTMENTS

                                        (cost $20,292,250) . . . . . . . . . . . . . . . .                        $  20,290,024
                                                                                                                  _____________

TOTAL INVESTMENTS (cost $687,733,106). . . . . . . . . . . . . . . . . . . . . . . . . . .             100.8%      $972,977,424
                                                                                                      _______     _____________


LIABILITIES, LESS CASH AND RECEIVABLES . . . . . . . . . . . . . . . . . . . . . . . . . .               (.8%)    $  (8,036,281)
                                                                                                      _______     _____________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             100.0%      $964,941,143
                                                                                                      _______     _____________



Notes to Statement of Investments:
- -----------------------------------------------------------------------------

(a) Non-income producing.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES                                                             NOVEMBER 30, 1998 (UNAUDITED)

                                                                                                     Cost             Value
                                                                                                _____________     _____________
<S>                                                                                              <C>               <C>
ASSETS:                          Investments in securities--See Statement of Investments . .     $687,733,106      $972,977,424

                                 Cash  . . . . . . . . . . . . . . . . . . . . . . . . . .                               59,294

                                 Receivable for shares of Common Stock subscribed  . . . .                              819,132

                                 Dividends receivable  . . . . . . . . . . . . . . . . . .                              561,581

                                 Prepaid expenses  . . . . . . . . . . . . . . . . . . . .                               22,844
                                                                                                                  _____________

                                                                                                                    974,440,275
                                                                                                                  _____________

LIABILITIES:                     Due to The Dreyfus Corporation and affiliates . . . . . .                              702,309

                                 Payable for shares of Common Stock redeemed . . . . . . .                            8,633,501

                                 Accrued expenses  . . . . . . . . . . . . . . . . . . . .                              163,322
                                                                                                                  _____________

                                                                                                                      9,499,132
                                                                                                                  _____________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         $964,941,143
                                                                                                                  _____________


REPRESENTED BY:                  Paid-in capital . . . . . . . . . . . . . . . . . . . . .                         $576,149,836

                                 Accumulated undistributed investment income--net  . . . .                               39,553

                                 Accumulated net realized gain (loss) on investments . . .                          103,507,436

                                 Accumulated net unrealized appreciation (depreciation)
                                   on investments--Note 4  . . . . . . . . . . . . . . . .                          285,244,318

                                                                                                                  _____________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                         $964,941,143

                                                                                                                  _____________

SHARES OUTSTANDING

(150 MILLION SHARES OF $.331/3 PAR VALUE COMMON STOCK AUTHORIZED). . . . . . . . . . . . .                           76,375,106

NET ASSET VALUE, offering and redemption price per share . . . . . . . . . . . . . . . . .                               $12.63
                                                                                                                        _______

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS                                                                     NOVEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
<S>                                                                                         <C>                   <C>
INCOME:                          Cash dividends (net of $11,445 foreign taxes
                                    withheld at source)  . . . . . . . . . . . . .          $ 3,575,103

                                 Interest  . . . . . . . . . . . . . . . . . . . .              817,861

                                                                                           ____________

                                    Total Income . . . . . . . . . . . . . . . . .                                $ 4,392,964

EXPENSES:                        Management fee--Note 3(a) . . . . . . . . . . . .            3,402,579

                                 Shareholder servicing costs--Note 3(b)  . . . . .              877,519

                                 Professional fees . . . . . . . . . . . . . . . .               54,438

                                 Custodian fees--Note 3(b) . . . . . . . . . . . .               35,221

                                 Registration fees . . . . . . . . . . . . . . . .               22,496

                                 Directors' fees and expenses--Note 3(c) . . . . .               17,286

                                 Prospectus and shareholders' reports  . . . . . .               10,218

                                 Loan commitments fees--Note 2 . . . . . . . . . .                2,136

                                 Interest expense--Note 2  . . . . . . . . . . . .                  969

                                 Miscellaneous . . . . . . . . . . . . . . . . . .               15,555

                                                                                           ____________

                                    Total Expenses . . . . . . . . . . . . . . . .                                  4,438,417

                                                                                                                 ____________

INVESTMENT (LOSS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                                    (45,453)

                                                                                                                 ____________

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS--Note 4:

                                 Net realized gain (loss) on investments . . . . .         $  9,709,495

                                 Net unrealized appreciation (depreciation) on
                                    investments  . . . . . . . . . . . . . . . . .           53,774,801

                                                                                           ____________

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS . . . . . . . . . . . . . .                                 63,484,296

                                                                                                                 ____________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS . . . . . . . . . . . . . . .                                $63,438,843

                                                                                                                 ____________

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

<TABLE>
<CAPTION>
THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS


                                                                                          Six Months Ended
                                                                                         November 30, 1998         Year Ended
                                                                                            (Unaudited)           May 31, 1998
                                                                                         _________________       ______________
<S>                                                                                      <C>                  <C>
OPERATIONS:

   Investment income (loss)--net . . . . . . . . . . . . . . . . . . . . . . . . . .     $         (45,453)   $         527,450

   Net realized gain (loss) on investments . . . . . . . . . . . . . . . . . . . . .             9,709,495          127,135,626

   Net unrealized appreciation (depreciation) on investments . . . . . . . . . . . .            53,774,801           61,034,848

                                                                                             _____________      _______________

       Net Increase (Decrease) in Net Assets Resulting from Operations . . . . . . .            63,438,843          188,697,924

                                                                                             _____________      _______________

DIVIDENDS TO SHAREHOLDERS FROM:

   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               --                (1,359,845)

   Net realized gain on investments  . . . . . . . . . . . . . . . . . . . . . . . .               --               (61,193,006)
                                                                                             _____________      _______________

       Total Dividends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               --               (62,552,851)
                                                                                             _____________      _______________

CAPITAL STOCK TRANSACTIONS:

   Net proceeds from shares sold . . . . . . . . . . . . . . . . . . . . . . . . . .           330,001,927        1,080,725,202

   Dividends reinvested  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               --                60,535,061

   Cost of shares redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          (340,187,337)      (1,032,801,808)
                                                                                             _____________      _______________

       Increase (Decrease) in Net Assets from Capital Stock Transactions . . . . . .           (10,185,410)         108,458,455
                                                                                             _____________      _______________

          Total Increase (Decrease) in Net Assets  . . . . . . . . . . . . . . . . .            53,253,433          234,603,528

NET ASSETS:

   Beginning of Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           911,687,710          677,084,182

                                                                                             _____________      _______________

   End of Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          $964,941,143      $   911,687,710
                                                                                             _____________      _______________

UNDISTRIBUTED INVESTMENT INCOME--NET . . . . . . . . . . . . . . . . . . . . . . . .      $         39,553  $            85,006
                                                                                             _____________      _______________

                                                                                                Shares               Shares
                                                                                             _____________      _______________

CAPITAL SHARE TRANSACTIONS:

   Shares sold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .            27,881,756           97,261,223

   Shares issued for dividends reinvested  . . . . . . . . . . . . . . . . . . . . .               --                 5,636,412

   Shares redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           (28,891,875)         (93,123,816)
                                                                                             _____________      _______________

       Net Increase (Decrease) in Shares Outstanding . . . . . . . . . . . . . . . .            (1,010,119)            9,773,819
                                                                                             _____________      _______________

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS

  Contained  below is per share operating performance data for a share of Common
Stock  outstanding,  total  investment  return, ratios to average net assets and
other  supplemental  data  for  each period indicated. This information has been
derived from the Fund's financial statements.

<TABLE>
<CAPTION>

                          Six Months Ended
                          November 30, 1998    Year Ended November 30,

____________________________________________________

PER SHARE DATA:                                    (Unaudited)        1998         1997        1996        1995        1994
                                              ____________________   _______      _______     _______      _______     _______
<S>                                                   <C>             <C>          <C>         <C>          <C>         <C>
   Net asset value, beginning of period  . . .        $11.78          $10.01       $ 9.25      $ 7.45       $ 7.80      $ 8.48
                                                     _______         _______      _______     _______      _______     _______

   Investment Operations:

   Investment income--net  . . . . . . . . . .           .00(1)          .01          .02         .03          .07         .05

   Net realized and unrealized gain (loss)
       on investments  . . . . . . . . . . . .           .85            2.68         2.16        2.39          .65        (.08)
                                                     _______         _______      _______     _______      _______     _______

   Total from Investment Operations  . . . . .           .85            2.69         2.18        2.42          .72        (.03)
                                                     _______         _______      _______     _______      _______     _______

   Distributions:

   Dividends from investment income--net . . .          --              (.02)        (.02)       (.05)        (.07)       (.04)

   Dividends from net realized gain on
       investments . . . . . . . . . . . . . .          --              (.90)       (1.40)       (.57)       (1.00)       (.61)
                                                     _______         _______      _______     _______      _______     _______

   Total Distributions . . . . . . . . . . . .          --              (.92)       (1.42)       (.62)       (1.07)       (.65)
                                                     _______         _______      _______     _______      _______     _______

   Net asset value, end of period  . . . . . .        $12.63          $11.78       $10.01      $ 9.25       $ 7.45      $ 7.80
                                                     _______         _______      _______     _______      _______     _______

TOTAL INVESTMENT RETURN. . . . . . . . . . . .          7.22%(2)       27.76%       25.70%      33.63%       11.81%       (.63%)

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets . .           .49%(2)         .97%        1.03%       1.11%        1.12%       1.17%

   Ratio of net investment income (loss)
       to average net assets . . . . . . . . .         (.01%)(2)         .07%         .22%        .36%         .93%        .52%

   Portfolio Turnover Rate . . . . . . . . . .         28.67%(2)       70.41%       66.52%      92.08%      133.54%       71.70%

   Net Assets, end of period (000's Omitted) . .    $964,941        $911,688     $677,084    $473,452     $368,833     $390,340
- -----------------------------

(1) Amount represents less than $.01 per share.

(2) Not annualized.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1--SIGNIFICANT ACCOUNTING POLICIES:

  The  Dreyfus  Third  Century  Fund,  Inc. (the "Fund") is registered under the
Investment Company Act of 1940, as amended (the "Act") as a diversified open-end
management  investment  company.   The Fund's investment objective is to provide
capital  growth.   The  Dreyfus  Corporation  (" Dreyfus" ) serves as the Fund's
investment  adviser.   Dreyfus  is  a  direct  subsidiary  of  Mellon Bank, N.A.
(" Mellon" ). NCM  Capital  Management  Group, Inc. ("NCM") serves as the Fund's
sub-investment  adviser.   Premier Mutual Fund Services, Inc. is the distributor
of the Fund's shares which are sold to the public without a sales charge.

  The  Fund' s  financial  statements  are prepared in accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions.  Actual results could differ from those estimates.

  (a)  Portfolio  valuation:  Investments  in  securities are valued at the last
sales  price  on  the securities exchange on which such securities are primarily
traded or at the last sales price on the national securities market.  Securities
not  listed  on an exchange or the national securities market, or securities for
which  there  were no transactions, are valued at the average of the most recent
bid  and  asked  prices.   Bid  price  is used when no asked price is available.
Securities  for  which  there are no such valuations are valued at fair value as
determined in good faith under the direction of the Board of Directors.

(b) Securities transactions and investment income: Securities transactions are
recorded  on  a  trade  date  basis.   Realized  gain  and  loss from securities
transactions  are  recorded  on  the  identified cost basis.  Dividend income is
recognized  on  the  ex-dividend  date  and  interest  income,  including, where
applicable,  amortization  of  discount  on  investments,  is  recognized on the
accrual  basis.  Under the terms of the custody agreement, the Fund receives net
earnings credits based on available cash balances left on deposit.

(c) Dividends to shareholders: Dividends are recorded on the ex-dividend date.
Dividends  from  investment  income-net  and dividends from net realized capital
gain   are   normally  declared  and  paid  annually,  but  the  Fund  may  make
distributions  on  a  more  frequent  basis  to  comply  with  the  distribution
requirements  of the Internal Revenue Code of 1986, as amended (the "Code").  To
the  extent  that  net  realized  capital  gain  can  be  offset by capital loss
carryovers, if any, it is the policy of the Fund not to distribute such gain.

  (d)  Federal income taxes: It is the policy of the Fund to continue to qualify
as  a  regulated  investment  company,  if  such  qualification  is  in the best
interests  of  its  shareholders, by complying with the applicable provisions of
the  Code,  and to make distributions of taxable income sufficient to relieve it
from substantially all Federal income and excise taxes.

NOTE 2--BANK LINE OF CREDIT:

  The  Fund  participates  with  other  Dreyfus-managed  funds in a $600 million
redemption  credit  facility  (the  "Facility" ) primarily  to  be  utilized for
temporary  or  emergency  purposes,  including the financing of redemptions.  In
connection therewith, the Fund has agreed to pay commitment fees on its pro rata
portion  of  the  Facility.   Interest  is charged to the Fund at rates based on
prevailing market rate in effect at the time of borrowings.

  The  average  daily  amount  of borrowings outstanding during the period ended
November  30,  1998, was  approximately $15,800, with a related weighted average
annualized interest rate of 6.15%.

THE DREYFUS THIRD CENTURY FUND, INC.
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

NOTE 3--INVESTMENT ADVISORY FEE, SUB-INVESTMENT ADVISORY FEE AND OTHER
TRANSACTIONS  WITH AFFILIATES:

  (a)  Pursuant  to  the  management  agreement  ("Agreement") with Dreyfus, the
management  fee  is  computed at an annual rate of .75 of 1% of the value of the
Fund' s average daily net assets and is payable monthly.  The Agreement provides
that if in any full fiscal year the aggregate expenses of the Fund, exclusive of
taxes,  brokerage,  interest  on  borrowings,  commitment fees and extraordinary
expenses,  exceed  11_2% of the value of the Fund's average net assets, the Fund
may  deduct  from  the  fees  paid  to Dreyfus, or Dreyfus will bear such excess
expense.   During  the  period  ended  November  30,  1998  there was no expense
reimbursement pursuant to the Agreement.

  Pursuant  to  a Sub-Investment Advisory Agreement with NCM, the sub-investment
advisory  fees  are  payable monthly by Dreyfus, and are based upon the value of
the Fund's average daily net assets, computed at the following rates:

  Average Net Assets

  __________________

  0 to $400 million. . . . . . . . . . . . . . . . . . . . . . .   .10 of 1%

  $400 million to $500 million . . . . . . . . . . . . . . . . .   .15 of 1%

  $500 million to $750 million . . . . . . . . . . . . . . . . .   .20 of 1%

  In excess of $750 million. . . . . . . . . . . . . . . . . . .   .25 of 1%

  (b)  Under  the Shareholder Services Plan, the Fund reimburses Dreyfus Service
Corporation,  a  wholly-owned  subsidiary of Dreyfus, an amount not to exceed an
annual rate of .25 of 1% of the value of the Fund's average daily net assets for
certain  allocated  expenses  of  providing personal services and/or maintaining
shareholder  accounts.   The  services  provided  may  include personal services
relating  to  shareholder  accounts,  such  as  answering  shareholder inquiries
regarding  the  Fund  and  providing reports and other information, and services
related  to  the  maintenance  of shareholder accounts.  During the period ended
November  30,  1998,  the  Fund was charged $574,748 pursuant to the Shareholder
Services Plan.

  The  Fund  compensates  Dreyfus  Transfer,  Inc., a wholly-owned subsidiary of
Dreyfus,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to perform transfer agency services for the Fund.  During the period
ended  November 30, 1998, the Fund was charged $147,082 pursuant to the transfer
agency agreement.

  The  Fund compensates Mellon under a custody agreement for providing custodial
services  for the Fund.  During the period ended November 30, 1998, the Fund was
charged $35,221 pursuant to the custody agreement.

  (c)  Each  director  who  is  not an "affiliated person" as defined in the Act
receives  from  the  Fund  an  annual fee of $10,000.  The Chairman of the Board
receives    an    additional    25%    of    such    compensation.

NOTE 4--SECURITIES TRANSACTIONS:

  The  aggregate  amount  of  purchases  and  sales  of  investment  securities,
excluding  short-term  securities,  during  the  period  ended November 30, 1998
amounted to $250,978,531 and $251,822,060, respectively.

  At  November  30, 1998, accumulated net unrealized appreciation on investments
was  $285,244,318,  consisting of $289,789,891 gross unrealized appreciation and
$4,545,573 gross unrealized depreciation.

  At  November 30, 1998, the cost of investments for Federal income tax purposes
was substantially the same as the cost for financial reporting purposes (see the
Statement of Investments).


                                   [reg.tm logo]

                                   (reg.tm)

THE DREYFUS

THIRD CENTURY FUND, INC.

200 Park Avenue

New York, NY 10166

INVESTMENT ADVISER

The Dreyfus Corporation

200 Park Avenue

New York, NY 10166

SUB-INVESTMENT ADVISER

NCM Captial Management Group, Inc.

103 West Main Street

Durham, North Carolina 27705

CUSTODIAN

Mellon Bank, N.A.

One Mellon Bank Center

Pittsburgh, PA 15258

TRANSFER AGENT &

DIVIDEND DISBURSING AGENT

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02940






Printed in U.S.A.                                             035SA9811

Third Century

Fund, Inc.

Semi-Annual

Report

November 30, 1998

Printed on recycled paper.

50% post-consumer.

Process chlorine free.

Vegetable-based ink.



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