Europa League 2020/21, First Qualifying Round |
 | 27.08.2020 |  | Motherwell | – | Glentoran |  | 5:1 (0:0) * |
| Motherwell |
Europa League 2020/21, Preliminary Round |
| 20.08.2020 | | Glentoran | – | HB Tórshavn |  | 1:0 (1:0) * |
| Belfast |
Europa League 2015/16, First Qualifying Round |
| 09.07.2015 |  | Žilina | – | Glentoran | | 3:0 (1:0) |
| Žilina |
Europa League 2015/16, First Qualifying Round |
| 02.07.2015 | | Glentoran | – | Žilina | | 1:4 (0:2) |
| Belfast |
Europa League 2013/14, First Qualifying Round |
| 11.07.2013 | | Glentoran | – | KR |  | 0:3 (0:1) |
| Belfast |
Europa League 2013/14, First Qualifying Round |
| 04.07.2013 | | KR | – | Glentoran | | 0:0 |
| Reykjavík |
Europa League 2011/12, Second qualifying round |
| 21.07.2011 |  | Vorskla | – | Glentoran | | 3:0 (2:0) |
 | Poltava |
Europa League 2011/12, Second qualifying round |
| 14.07.2011 | | Glentoran | – | Vorskla | | 0:2 (0:2) |
| Belfast |
Europa League 2011/12, First Qualifying Round |
| 07.07.2011 | | Glentoran | – | Renova |  | 2:1 aet
(1:0, 2:1),
pen. 3:2 |
| Belfast |
Europa League 2011/12, First Qualifying Round |
| 30.06.2011 | | Renova | – | Glentoran | | 2:1 (1:1) |
| Skopje |
Europa League 2010/11, First Qualifying Round |
| 08.07.2010 | | Glentoran | – | KR | | 2:2 (1:1) |
| Belfast |
Europa League 2010/11, First Qualifying Round |
| 01.07.2010 | | KR | – | Glentoran | | 3:0 (2:0) |
| Reykjavík |
UEFA Cup 2008/09, First Qualifying Round |
| 31.07.2008 |  | Metalurgs Liepaja | – | Glentoran | | 2:0 (1:0) |
| Liepāja |
UEFA Cup 2008/09, First Qualifying Round |
| 17.07.2008 | | Glentoran | – | Metalurgs Liepaja | | 1:1 (1:1) |
| Belfast |
UEFA Cup 2007/08, First Qualifying Round |
| 02.08.2007 |  | AIK | – | Glentoran | | 4:0 (2:0) |
| Solna |
UEFA Cup 2007/08, First Qualifying Round |
| 19.07.2007 | | Glentoran | – | AIK | | 0:5 (0:1) |
| Belfast |
UEFA Cup 2006/07, First Qualifying Round |
| 27.07.2006 |  | Brann | – | Glentoran | | 1:0 (0:0) |
| Bergen |
UEFA Cup 2006/07, First Qualifying Round |
| 13.07.2006 | | Glentoran | – | Brann | | 0:1 (0:0) |
| Belfast |
UEFA Cup 2004/05, Second Qualifying Round |
| 26.08.2004 | | Elfsborg | – | Glentoran | | 2:1 (1:1) |
| Borås |
UEFA Cup 2004/05, Second Qualifying Round |
| 12.08.2004 | | Glentoran | – | Elfsborg | | 0:1 (0:0) |
| Belfast |
UEFA Cup 2004/05, First Qualifying Round |
| 29.07.2004 |  | Allianssi | – | Glentoran | | 1:2 (1:0) |
| Vantaa |
UEFA Cup 2004/05, First Qualifying Round |
| 15.07.2004 | | Glentoran | – | Allianssi | | 2:2 (1:0) |
| Belfast |
UEFA Cup 2002/03, Qualifying round |
| 29.08.2002 |  | Wisła Kraków | – | Glentoran | | 4:0 (1:0) |
| Kraków |
UEFA Cup 2002/03, Qualifying round |
| 15.08.2002 | | Glentoran | – | Wisła Kraków | | 0:2 (0:0) |
| Belfast |
UEFA Cup 2001/02, Qualifying round |
| 23.08.2001 | | Glentoran | – | Midtjylland |  | 0:4 (0:1) |
| Belfast |
UEFA Cup 2001/02, Qualifying round |
| 09.08.2001 | | Midtjylland | – | Glentoran | | 1:1 (1:0) |
| Silkeborg |
UEFA Cup 2000/01, Qualifying round |
| 24.08.2000 | | Lillestrøm | – | Glentoran | | 1:0 (0:0) |
| Lillestrøm |
UEFA Cup 2000/01, Qualifying round |
| 10.08.2000 | | Glentoran | – | Lillestrøm | | 0:3 (0:2) |
| Belfast |
UEFA Cup 1989/90, 1/32 finals |
| 27.09.1989 | | Dundee United | – | Glentoran | | 2:0 (1:0) |
| Dundee |
UEFA Cup 1989/90, 1/32 finals |
| 13.09.1989 | | Glentoran | – | Dundee United | | 1:3 (0:1) |
| Belfast |
UEFA Cup 1984/85, 1/32 finals |
| 03.10.1984 |  | Standard | – | Glentoran | | 2:0 (1:0) |
| Liège |
UEFA Cup 1984/85, 1/32 finals |
| 18.09.1984 | | Glentoran | – | Standard | | 1:1 (1:0) |
| Belfast |
UEFA Cup 1982/83, 1/32 finals |
| 29.09.1982 |  | Baník | – | Glentoran | | 1:0 (0:0) |
| Ostrava |
UEFA Cup 1982/83, 1/32 finals |
| 15.09.1982 | | Glentoran | – | Baník | | 1:3 (0:1) |
| Belfast |
UEFA Cup 1978/79, 1/32 finals |
| 14.09.1978 | | Glentoran | – | Vestmannaeyjar | | 1:1 (1:0) |
| Belfast |
UEFA Cup 1978/79, 1/32 finals |
| 05.09.1978 | | Vestmannaeyjar | – | Glentoran | | 0:0 |
| Reykjavík |
UEFA Cup 1976/77, 1/32 finals |
| 29.09.1976 |  | Basel | – | Glentoran | | 3:0 (2:0) |
| Basel |
UEFA Cup 1976/77, 1/32 finals |
| 14.09.1976 | | Glentoran | – | Basel | | 3:2 (2:1) |
| Belfast |
UEFA Cup 1975/76, 1/32 finals |
| 01.10.1975 |  | Ajax | – | Glentoran | | 8:0 (2:0) |
| Amsterdam |
UEFA Cup 1975/76, 1/32 finals |
| 16.09.1975 | | Glentoran | – | Ajax | | 1:6 (0:3) |
| Belfast |
UEFA Cup 1971/72, 1/32 finals |
| 28.09.1971 |  | Eintracht Braunschweig | – | Glentoran | | 6:1 (4:1) |
| Braunschweig |
UEFA Cup 1971/72, 1/32 finals |
| 14.09.1971 | | Glentoran | – | Eintracht Braunschweig | | 0:1 (0:1) |
| Belfast |
Inter-Cities Fair Cup 1969/70, 1/32 finals |
| 29.09.1969 | | Glentoran | – | Arsenal |  | 1:0 (1:0) |
| Belfast |
Inter-Cities Fair Cup 1969/70, 1/32 finals |
| 09.09.1969 | | Arsenal | – | Glentoran | | 3:0 (3:0) |
| London |
Inter-Cities Fair Cup 1965/66, 1/32 finals |
| 06.10.1965 | | Glentoran | – | Antwerp | | 3:3 (1:1) |
| Belfast |
Inter-Cities Fair Cup 1965/66, 1/32 finals |
| 28.09.1965 | | Antwerp | – | Glentoran | | 1:0 (1:0) |
| Antwerpen |
Inter-Cities Fair Cup 1963/64, 1/16 finals |
| 01.10.1963 | | Partick Thistle | – | Glentoran | | 3:0 (0:0) |
| Glasgow |
Inter-Cities Fair Cup 1963/64, 1/16 finals |
| 16.09.1963 | | Glentoran | – | Partick Thistle | | 1:4 (1:1) |
| Belfast |
Inter-Cities Fair Cup 1962/63, 1/16 finals |
| 10.10.1962 |  | Real Zaragoza | – | Glentoran | | 6:2 (2:1) |
| Zaragoza |
Inter-Cities Fair Cup 1962/63, 1/16 finals |
| 26.09.1962 | | Glentoran | – | Real Zaragoza | | 0:2 (0:1) |
| Belfast |
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