| 1897 | Southampton St Mary's became simply Southampton |
| 1897-98 | Southern League Champions (2nd time) |
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| F.A. Cup semi-finalists |
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| Also played in United League |
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| Two points deducted in United League for fielding ineligible |
|
| player |
| 1898-99 | Southern League Champions (3rd time) |
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| Also played in Western League, AND United League |
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| United League runner-up |
| 1899-00 | F.A. Cup runner-up |
| 1900-01 | Southern League Champions (4th time) |
|
| Also joined Western League |
| 1901-02 | F.A. Cup runner-up |
| 1902-03 | Southern League Champions (5th time) |
| 1903-04 | Southern League Champions (6th time) |
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| Western League runner-up |
| 1905-06 | Southern League runner-up |
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| Western League runner-up |
| 1907-08 | Western League Division 1A Champions |
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| Lost play-off with Division 1B Champions Millwall 1-0 at |
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| Tottenham (13.4.1908) |
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| F.A. Cup semi-finalists |
| 1908-09 | Western League Division 1B runner-up |
| 1920-21 | Founder member of Division Three South |
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| Division Three South runner-up |
| 1921-22 | Football League Division Three South Champions (on goal average) |
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| Promoted to Division Two |
| 1924-25 | F.A. Cup semi-finalists |
| 1926-27 | F.A. Cup semi-finalists |
| 1939-40 | Football League programme abandoned due to outbreak of war |
| 1949-50 | Finished 4th, missed promotion to Division One by goal average |
| 1953 | Relegated to Division Three South |
| 1958-59 | Placed in Division Three upon re-organisation |
| 1959-60 | Football League Division Three Champions |
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| Promoted to Division Two |
| 1962-63 | F.A. Cup semi-finalists |
| 1965-66 | Football League Division Two runner-up |
|
| Promoted to Division One |
| 1974 | Relegated to Division Two (first victims of three up, three down) |
| 1975-76 | F.A. Cup Winners |
| 1976-77 | European Cup Winners Cup Quarter Finalists |
| 1977-78 | Football League Division Two runner-up |
|
| Promoted to Division One |
| 1978-79 | Football League Cup runner-up |
| 1983-84 | Football League runner-up |
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| F.A. Cup semi-finalists |
| 1985-86 | F.A. Cup semi-finalists |
| 1986-87 | Football League Cup semi-finalists |
| 1992-93 | Founder members of F.A. Premiership |
| 1996 | Escaped relegation by goal difference |
| 2002-03 | F.A. Cup runner-up |
| 2004-05 | Relegated to Football League Division One |
