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Chelsea matches where Martin O'Neill was opposition manager/coach
| Date | Venue | Opponent | Score | Comp |
| 12/10/1996 | Filbert Street | Leicester City | 3-1 | Premier League |
| 16/02/1997 | Filbert Street | Leicester City | 2-2 | F.A. Cup |
| 26/02/1997 | Stamford Bridge | Leicester City | 1-0 | F.A. Cup |
| 19/04/1997 | Stamford Bridge | Leicester City | 2-1 | Premier League |
| 18/10/1997 | Stamford Bridge | Leicester City | 1-0 | Premier League |
| 21/02/1998 | Filbert Street | Leicester City | 0-2 | Premier League |
| 21/11/1998 | Filbert Street | Leicester City | 4-2 | Premier League |
| 18/04/1999 | Stamford Bridge | Leicester City | 2-2 | Premier League |
| 14/08/1999 | Filbert Street | Leicester City | 2-2 | Premier League |
| 15/01/2000 | Stamford Bridge | Leicester City | 1-1 | Premier League |
| 30/01/2000 | Stamford Bridge | Leicester City | 2-1 | F.A. Cup |
| 30/09/2006 | Stamford Bridge | Aston Villa | 1-1 | Premier League |
| 08/11/2006 | Stamford Bridge | Aston Villa | 4-0 | Carling Cup |
| 02/01/2007 | Villa Park | Aston Villa | 0-0 | Premier League |
| 02/09/2007 | Villa Park | Aston Villa | 0-2 | Premier League |
| 26/12/2007 | Stamford Bridge | Aston Villa | 4-4 | Premier League |
| 05/10/2008 | Stamford Bridge | Aston Villa | 2-0 | Premier League |
| 21/02/2009 | Villa Park | Aston Villa | 1-0 | Premier League |
| 17/10/2009 | Villa Park | Aston Villa | 1-2 | Premier League |
| 27/03/2010 | Stamford Bridge | Aston Villa | 7-1 | Premier League |
| 10/04/2010 | Wembley | Aston Villa | 3-0 | F.A. Cup |
| 14/01/2012 | Stamford Bridge | Sunderland | 1-0 | Premier League |
| 08/12/2012 | Stadium Of Light | Sunderland | 3-1 | Premier League |