| 1936-37 |
Southern League Champions |
| 1953-54 |
Football League Division 3 (South) Champions |
| 1956-57 |
Football League Division 3 (South) Champions |
| 1960-61 |
Football League Division 2 Champions |
| 1961-62 |
Football League Division 1 Champions |
| 1967-68 |
Football League Division 2 Champions |
| 1972-73 |
Texaco Cup Winners |
| |
FA Youth Cup Winners |
| 1974-75 |
FA Youth Cup Winners |
| 1977-78 |
FA Cup Winners |
| 1980-81 |
Football League Division 1 Runners-Up |
|
UEFA Cup Winners |
| 1981-82 |
Football League Division 1 Runners-Up |
| 1991-92 |
Football League Division 2 Champions |
| 1999-00 |
Football League Division 1 Play-off Winners |
| 2004-05 |
FA Youth Cup Winners |
| 1886-87 |
Suffolk Challenge Cup Winners |
| 1888-89 |
Suffolk Challenge Cup Winners |
| 1889-90 |
Suffolk Challenge Cup Winners |
| 1895-96 |
Suffolk Senior Cup Winners |
| 1896-97 |
Ipswich Charity Cup Winners |
| 1897-98 |
Ipswich Charity Cup Winners |
| 1898-99 |
Ipswich Charity Cup Winners |
| 1899-00 |
Suffolk Senior Cup Winners |
|
Ipswich Charity Cup Winners |
| 1902-03 |
Norfolk & Suffolk League Runners-Up |
| 1903-04 |
Suffolk Senior Cup Winners |
|
South East Anglian League Champions |
| 1904-05 |
Suffolk Senior Cup Winners |
|
South East Anglian League Runners-Up |
| 1905-06 |
Suffolk Senior Cup Winners |
| 1906-07 |
Suffolk Senior Cup Winners |
| 1907-08 |
Suffolk Senior Cup Winners |
| 1911-12 |
Suffolk Senior Cup Winners |
| 1912-13 |
Suffolk Senior Cup Winners |
| 1921-22 |
Southern Amateur League Champions |
| 1922-23 |
Southern Amateur League Runners-Up |
| 1927-28 |
AFA Cup Finalists |
|
Suffolk Senior Cup Winners |
| 1928-29 |
Suffolk Senior Cup Winners |
| 1929-30 |
Suffolk Senior Cup Winners |
|
Ipswich Hospital Cup Winners |
|
Southern Amateur League Champions |
| 1930-31 |
Ipswich Hospital Cup Winners |
|
Southern Amateur League Runners-Up |
| 1932-33 |
Ipswich Hospital Cup Winners |
|
Southern Amateur League Champions |
| 1933-34 |
Southern Amateur League Champions |