Titles
Northern Irish champion23×2008/09, 2004/05, 2002/03, 1998/99, 1991/92, 1987/88, 1980/81, 1976/77, 1971/72, 1969/70, 1967/68, 1966/67, 1963/64, 1952/53, 1950/51, 1930/31, 1924/25, 1920/21, 1912/13, 1911/12, 1904/05, 1896/97, 1893/94
Irish Cup winner23×2019/20, 2014/15, 2012/13, 2003/04, 2000/01, 1999/00, 1997/98, 1995/96, 1989/90, 1987/88, 1986/87, 1985/86, 1984/85, 1982/83, 1972/73, 1965/66, 1950/51, 1934/35, 1932/33, 1931/32, 1920/21, 1916/17, 1913/14
Northern Irish League Cup winner7×2009/10, 2006/07, 2004/05, 2002/03, 2000/01, 1990/91, 1988/89
Northern Irish Charity Shield winner2×2014/15, 1991/92
Glentoran FC ranks No. 44 in the worldwide honours ranking.
Title chronology
| Season | Competition | Trophy |
|---|---|---|
| 2019/20 | Irish Cup |  |
| 2014/15 | NIFL Charity Shield |  |
| 2014/15 | Irish Cup | |
| 2012/13 | Irish Cup | |
| 2009/10 | Irish League Cup |  |
| 2008/09 | IFA Premiership |  |
| 2006/07 | Irish League Cup | |
| 2004/05 | Irish Premier League | |
| 2004/05 | Irish League Cup | |
| 2003/04 | Irish Cup | |
| 2002/03 | Irish Football League Premier Division | |
| 2002/03 | Irish League Cup | |
| 2000/01 | Irish Cup | |
| 2000/01 | Irish League Cup | |
| 1999/00 | Irish Cup | |
| 1998/99 | Irish Football League Premier Division | |
| 1997/98 | Irish Cup | |
| 1995/96 | Irish Cup | |
| 1991/92 | Irish Football League | |
| 1991/92 | Irish League Charity Shield | |
| 1990/91 | Irish League Cup | |
| 1989/90 | Irish Cup | |
| 1988/89 | Irish League Cup | |
| 1987/88 | Irish Football League | |
| 1987/88 | Irish Cup | |
| 1986/87 | Irish Cup | |
| 1985/86 | Irish Cup | |
| 1984/85 | Irish Cup | |
| 1982/83 | Irish Cup | |
| 1980/81 | Irish Football League | |
| 1976/77 | Irish Football League | |
| 1972/73 | Irish Cup | |
| 1971/72 | Irish Football League | |
| 1969/70 | Irish Football League | |
| 1967/68 | Irish Football League | |
| 1966/67 | Irish Football League | |
| 1965/66 | Irish Cup | |
| 1963/64 | Irish Football League | |
| 1952/53 | Irish Football League | |
| 1950/51 | Irish Football League | |
| 1950/51 | Irish Cup | |
| 1934/35 | Irish Cup | |
| 1932/33 | Irish Cup | |
| 1931/32 | Irish Cup | |
| 1930/31 | Irish Football League | |
| 1924/25 | Irish Football League | |
| 1920/21 | Irish Football League | |
| 1920/21 | Irish Cup | |
| 1916/17 | Irish Cup | |
| 1913/14 | Irish Cup | |
| 1912/13 | Irish Football League | |
| 1911/12 | Irish Football League | |
| 1904/05 | Irish Football League | |
| 1896/97 | Irish Football League | |
| 1893/94 | Irish Football League | |
Final appearances without a title
| Season | Competition | Opponent |
|---|---|---|
| 2025/26 | Northern Ireland League Cup |  Linfield FC |
| 2024/25 | Northern Ireland League Cup |  Cliftonville FC |
| 2005/06 | Irish League Cup | Linfield FC |
| 2005/06 | Irish Cup | Linfield FC |
| 2002/03 | Irish Cup |  Coleraine FC |
| 2001/02 | Irish League Cup | Linfield FC |
| 1999/00 | Irish League Charity Shield | Linfield FC |
| 1998/99 | Irish League Cup | Linfield FC |
| 1998/99 | Irish League Charity Shield |  Portadown FC |
| 1997/98 | Irish League Cup | Linfield FC |
| 1997/98 | Irish League Charity Shield | Cliftonville FC |
| 1996/97 | Irish League Cup |  Crusaders FC |
| 1966/67 | Irish Cup | Crusaders FC |
| 1963/64 | Irish Cup |  Derry City FC |
| 1955/56 | Irish Cup |  Distillery |
| 1953/54 | Irish Cup | Derry City FC |
| 1951/52 | Irish Cup |  Ards FC |
| 1948/49 | Irish Cup | Derry City FC |
| 1946/47 | Irish Cup | Belfast Celtic FC |
| 1944/45 | Irish Cup | Linfield FC |
| 1942/43 | Irish Cup | Belfast Celtic FC |
| 1941/42 | Irish Cup | Linfield FC |
| 1924/25 | Irish Cup | Distillery |
| 1922/23 | Irish Cup | Linfield FC |
| 1918/19 | Irish Cup | Linfield FC |
| 1915/16 | Irish Cup | Linfield FC |
| 1912/13 | Irish Cup | Linfield FC |
| 1898/99 | Irish Cup | Linfield FC |
| 1895/96 | Irish Cup | Distillery |