Filed pursuant to Rule 424(b)(3) and 424(c)
                                                    Registration No. 333-101489

PROSPECTUS SUPPLEMENT NO. 4
(To prospectus dated February 10, 2003)

                                  $305,000,000
                         SELECTIVE INSURANCE GROUP, INC.
                        Senior Convertible Notes due 2032
                                  Common Stock
                          ____________________________

                  This document supplements the prospectus dated February 10,
2003 of Selective Insurance Group, Inc. relating to the resale by certain
holders of notes who are named as selling securityholders of up to $305,000,000
aggregate principal amount at maturity of the notes and the shares of common
stock issuable upon conversion of the notes.

                  You should read this prospectus supplement in conjunction with
the prospectus dated February 10, 2003. This prospectus supplement is qualified
by reference to the prospectus dated February 10, 2003, except to the extent
that the information in this prospectus supplement supersedes the information
contained in the February 10, 2003 prospectus.

                  The table of selling securityholders beginning on page 51 of
the prospectus is hereby amended to add the following principal amounts of notes
beneficially owned that may be sold:




                                                                                                  
                                                   Principal
                                                    Amount
                                                   of Notes                        Number of       Number of
                                                 Beneficially                      Shares of       Shares of
                                                     Owned       Percentage of    Common Stock   Common Stock     Percentage of
                   Name of                        That May Be        Notes        Beneficially    That May Be     Common Stock
          Selling Securityholder(1)                  Sold         Outstanding       Owned(2)      Sold(3)(4)     Outstanding(5)
------------------------------------------------------------------------------------------------------------------------------------
SuttonBrook Capital Portfolio LP                  34,500,000         11.31%           N/A           447,751           1.65%



         After giving effect to the addition of the foregoing selling
securityholder, the table of selling securityholders reads as follows:

                                                                 Selling Securityholders

                                              Principal Amount                     Number of       Number of
                                                  of Notes                         Shares of       Shares of
                                                Beneficially     Percentage of    Common Stock   Common Stock     Percentage of
                  Name of                           Owned            Notes        Beneficially    That May Be     Common Stock
         Selling Securityholder(1)            That May Be Sold    Outstanding       Owned(2)      Sold(3)(4)     Outstanding(5)
------------------------------------------------------------------------------------------------------------------------------------
  AKELA Capital Master Fund Ltd.                   15,000,000        4.92%            N/A           194,674            *
  Alexandra Global Master Fund, Ltd.               10,000,000        3.28%            N/A           129,783            *
  Allstate Life Insurance                           2,000,000          *           13,200(6)         25,956            *
  Arbitex Master Fund                              16,500,000        5.41%            N/A           214,141            *
  Argent Classic Convertible Arbitrage Fund
  (Bermuda) Ltd.                                    2,000,000          *              N/A            25,956            *
  Argent Low Lev Convertible Arbitrage                700,000          *              N/A             9,084            *





                                                   Principal
                                                    Amount
                                                   of Notes                        Number of       Number of
                                                 Beneficially                      Shares of       Shares of
                                                     Owned       Percentage of    Common Stock   Common Stock     Percentage of
                   Name of                        That May Be        Notes        Beneficially    That May Be     Common Stock
          Selling Securityholder(1)                  Sold         Outstanding       Owned(2)      Sold(3)(4)     Outstanding(5)
------------------------------------------------------------------------------------------------------------------------------------
  Fund LLC
  Argent Low Lev Convertible Arbitrage Fund
  Ltd.                                              4,400,000        1.44%            N/A            57,104            *
  BGI Global Investors C/O Forest
  Investment Management L.L.C.                        536,000          *              N/A             6,956            *
  BNP Paribus Equity Strategies, SNC               20,850,000        6.84%           26,003         270,597            1.09%
  Calamos Convertible Fund - Calamos
  Investment Trust                                 13,300,000        4.36%            N/A           172,611            *
  Calamos Convertible Growth & Income Fund
  - Calamos Investment Trust                       10,900,000        3.57%            N/A           141,463            *
  Calamos Convertible Portfolio - Calamos
  Advisor Trust                                       300,000          *              N/A             3,893            *
  CC Investments LOC                                  250,000          *              N/A             3,244            *
  Chrysler Corporation Master Retirement
  Trust                                             2,595,000          *              N/A            33,678            *
  Context Convertible Arbitrage Fund, LP              165,000          *              N/A             2,141            *
  Context Convertible Arbitrage Offshore, LP           85,000          *              N/A             1,103            *
  Cooper Neff Convertible Strategies
  (Cayman) Master Fund L.P.                        11,189,000        3.67%            N/A           145,214            *
  Deephaven Domestic Convertible Trading Ltd.       3,250,000        1.07%            N/A            42,179            *
  Delta AIR Lines Master Trust
  (c/o Oaktree Capital Management, LLC)               655,000          *              N/A             8,500            *
  Delta Pilots D & S Trust (c/o Oaktree
  Capital Management, LLC)                            360,000          *              N/A             4,672            *
  Forest Fulcrum Fund L.L.P.                        1,383,000          *              N/A            17,948            *
  Forest Global Convertible Fund Series A-5         6,079,000        1.99%            N/A            78,895            *
  Forest Multi-Strategy Master/Fund SPC on
  Behalf of Series F, Multi-Strategy
  Segregated Portfolio                              2,000,000          *              N/A            25,956            *
  GDO Equity Arbitrage Master Fund                  1,000,000          *              N/A            12,978            *
  Grace Convertible Arbitrage Fund Ltd.             5,000,000        1.64%            N/A            64,891            *
  JMG Convertible Investments LP                    1,500,000          *              N/A            19,467            *
  KBC Financial Products USA Inc.                  11,560,000        3.79%            N/A           150,029            *
  LLT Limited                                         498,000          *              N/A             6,463            *
  Lyxor Master Fund                                 2,000,000          *              N/A            25,956            *
  Lyxor Master Fund C/O Forest Investment
  Management L.L.C.                                 2,295,000          *              N/A            29,785            *
  Lyxor Master Fund Ref: Argent/LowLev CB
  c/o Argent                                        1,000,000          *              N/A            12,978            *
  Marathon Global Convertible Master Fund
  Ltd.                                              5,000,000        1.64%            N/A            64,891            *
  McMahan Securities Co. L.P.                      12,250,000        4.02%            N/A           158,984            *
  Merrill Lynch, Pierce Fenner and Smith
  Inc.                                              5,960,000        1.95%            N/A            77,350            *
  Miller Tabak Roberts LLC                          1,500,000          *              N/A            19,467            *
  Microsoft Corporation                               935,000          *              N/A            12,134            *

                                                                                2





                                                   Principal
                                                    Amount
                                                   of Notes                        Number of       Number of
                                                 Beneficially                      Shares of       Shares of
                                                     Owned       Percentage of    Common Stock   Common Stock     Percentage of
                   Name of                        That May Be        Notes        Beneficially    That May Be     Common Stock
          Selling Securityholder(1)                  Sold         Outstanding       Owned(2)      Sold(3)(4)     Outstanding(5)
------------------------------------------------------------------------------------------------------------------------------------
  MLQA Convertible Securities Arbitrage Ltd        15,000,000        4.92%            N/A           194,674            *
  Motion Picture Industry Health
  Plan-Active Member Fund                             170,000          *              N/A             2,206            *
  Motion Picture Industry Health
  Plan-Retiree Member Fund                            105,000          *              N/A             1,362            *
  OCM Convertible Trust                             1,725,000          *              N/A            22,387            *
  Partner Reinsurance Company, Ltd.                   540,000          *              N/A             7,008            *
  Partners Group Alternative Strategies
  PCC, Ltd.                                           200,000          *              N/A             2,595            *
  Plexus Fund Limited                              10,750,000        3.52%            N/A           139,516            *
  Qwest Occupational Health Trust                     200,000          *              N/A             2,595            *
  RBC Alternative Assets LP C/O Forest
  Investment Management L.L.C.                        510,000          *              N/A             6,618            *
  Relay II Holdings C/O Forest Investment
  Management L.L.C.                                   255,000          *              N/A             3,309            *
  Salomon Smith Barney                             9,300,000         3.05%            N/A           120,698             *
  Sphinx Convertible Abritrage C/O Forest
  Investment Management L.L.C.                        128,000          *              N/A             1,661            *
  State Employee's Retirement Fund of the
  State of Delaware                                   715,000          *              N/A             9,279            *
  Sturgen Limited                                   2,711,000          *              N/A            35,184            *
  Sunrise Partners Limited Partnership             14,250,000        4.67%            N/A           184,940            *
  SusQuehanna Capital Group                         5,000,000        1.64%            N/A            64,891            *
  SuttonBrook Capital Portfolio LP                 34,500,000        11.31%           N/A           447,751            1.65%
  Thrivent Financial for Lutherans                  1,000,000          *              N/A            12,978            *
  Transamerica Life Insurance & Annuity
  Company                                          24,500,000        8.03%            N/A           317,968            1.17%
  UFJ Investments Asia Limited                        250,000          *              N/A             3,244            *
  Victus Capital LP                                17,000,000        5.57%            N/A           220,631            *
  Wachovia Securities International LTD            32,000,000        10.49%           N/A           415,305            1.53%
  Xavex Convertible Arbitrage 2 Fund                  200,000          *              N/A             2,595            *
  Zazove Convertible Arbitrage Fund LP              7,000,000        2.30%            N/A            90,848            *
  Zazove Hedged Convertible Fund LP                 2,500,000          *              N/A            32,445            *
  Zazove Income Fund LP                             1,000,000          *              N/A            12,978            *
  Zurich Institutional Benchmarks Master
  Fund Ltd.                                           500,000          *              N/A             6,489            *
  Zurich Institutional Benchmarks Master
  Fund Ltd.                                         2,500,000          *              N/A            32,445            *
  Zurich Institutional Benchmarks Master
  Fund c/o Argent                                     500,000          *              N/A             6,489            *
  Zurich Master Hedge Fund C/O Forest
  Investment Management L.L.C.                        816,000          *              N/A            10,590            *
                                                      -------          -              ---            ------            -

  Total                                       $305,000,000(7)       100.00%          39,203      3,958,382(7)        14.58%
                                              ===============       =======          ======      ============        ======


_______________
*  Less than 1%


                                        3



(1)           Also includes any sale of the notes and the underlying common
              stock by pledgees, donees, transferees or other successors in
              interest that receive such securities by pledge, gift,
              distribution or other non-sale related transfer from the named
              selling securityholders. Information about other selling
              securityholders will be set forth in future prospectus supplements
              or in other documents that we file from time to time with the
              Securities and Exchange Commission that are incorporated by
              reference in the prospectus, if required. See "Where You Can Find
              More Information" in the prospectus.

(2)           Excludes common stock issuable upon conversion of the selling
              securityholder's notes.

(3)           Assumes conversion of all of the selling securityholder's notes
              at a conversion rate of 12.9783 per note and a cash payment in
              lieu of the issuance of any fractional share interest. However,
              this conversion rate is subject to adjustment as described under
              "Description of the Notes -- Conversion Rights" in the prospectus.
              As a result, the number of shares of common stock issuable upon
              conversion of the notes may increase or decrease in the future.

(4)           Reflects rounding down of fractional common stock issuable to
              each selling securityholder upon conversion of the notes.

(5)           Calculated based on Rule 13d-3 of the Securities Exchange Act of
              1934 using 27,152,579 shares of common stock outstanding as of
              September 30, 2003. In calculating this amount, we did not treat
              as outstanding the common stock issuable upon conversion of notes.

(6)           Consists of 9,000 shares held by Allstate Insurance Company,
              3,100 shares held by Allstate Retirement Plan and 1,100 shares
              held by Agents Pension Plan.

(7)           The figures in these columns are based on information supplied
              to us, as of October 8, 2003, by the respective selling security
              holders named in the table.  As of that date, these selling
              securityholders had supplied us with information indicating that,
              collectively, they owned more than $305,000,000 aggregate
              principal amount of notes (which would be convertible into more
              than 3,958,382 shares of common stock), reflecting, we believe,
              that one or more selling securityholders supplied us with
              information for inclusion in the table and then sold their notes
              in transactions exempt from the registration requirements of the
              Securities Act to persons who also supplied us with information
              with respect to the same notes.  However, since this prospectus
              supplement would not be applicable to any sale of notes after
              they have been publicly sold utilizing this prospectus supplement
              or a prior prospectus supplement or prospectus, no more than
              $305,000,000 principal amount of notes, nor more than 3,958,382
              shares of common stock, could be sold utilizing this prospectus
              supplement.  Accordingly, the $305,000,000 and the 3,958,382
              share totals in these columns have been retained and represent
              the maximum principal amount of notes and maximum number of
              shares of common stock that could be sold hereunder.

                  The above table sets forth information as of October 8, 2003,
based on information supplied to us by the selling securityholders named in the
table. The selling securityholders listed in the above table may have sold or
transferred, in transactions exempt from the registration requirements of the
Securities Act, some or all of their notes since the date on which the
information was supplied to us and presented in the above table. Information
about the selling securityholders may change over time. Any changed information
supplied to us will be set forth in future prospectus supplements.

                          ____________________________

                  Investing in the notes involves risks that are described in
the "Risk Factors" section beginning on page 9 of the prospectus.

                          ____________________________

                                        4

                  Neither the Securities and Exchange Commission nor any state
securities commission has approved or disapproved of these securities or passed
upon the adequacy or accuracy of this prospectus supplement. Any representation
to the contrary is a criminal offense.


                          ____________________________

           The date of this prospectus supplement is October 10, 2003.