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Chelsea matches where Lee Mason was referee
| Date | Venue | Opponent | Score | Comp |
| 06/01/2007 | Stamford Bridge | Macclesfield Town | 6-1 | F.A. Cup |
| 07/02/2009 | Stamford Bridge | Hull City | 0-0 | Premier League |
| 21/11/2009 | Stamford Bridge | Wolverhampton Wanderers | 4-0 | Premier League |
| 24/03/2010 | Fratton Park | Portsmouth | 5-0 | Premier League |
| 16/10/2010 | Villa Park | Aston Villa | 0-0 | Premier League |
| 02/01/2011 | Stamford Bridge | Aston Villa | 3-3 | Premier League |
| 15/05/2011 | Stamford Bridge | Newcastle United | 2-2 | Premier League |
| 20/08/2011 | Stamford Bridge | West Bromwich Albion | 2-1 | Premier League |
| 26/10/2011 | Goodison Park | Everton | 2-1 | Carling Cup |
| 26/11/2011 | Stamford Bridge | Wolverhampton Wanderers | 3-0 | Premier League |
| 31/03/2012 | Villa Park | Aston Villa | 4-2 | Premier League |
| 13/05/2012 | Stamford Bridge | Blackburn Rovers | 2-1 | Premier League |
| 22/08/2012 | Stamford Bridge | Reading | 4-2 | Premier League |
| 31/10/2012 | Stamford Bridge | Manchester United | 5-4 | Capital One Cup |
| 02/01/2013 | Stamford Bridge | Queens Park Rangers | 0-1 | Premier League |
| 11/05/2013 | Villa Park | Aston Villa | 2-1 | Premier League |
| 02/11/2013 | St James' Park | Newcastle United | 0-2 | Premier League |
| 29/03/2014 | Selhurst Park | Crystal Palace | 0-1 | Premier League |
| 23/08/2014 | Stamford Bridge | Leicester City | 2-0 | Premier League |
| 22/11/2014 | Stamford Bridge | West Bromwich Albion | 2-0 | Premier League |
| 24/05/2015 | Stamford Bridge | Sunderland | 3-1 | Premier League |
| 23/09/2015 | Bescot Stadium | Walsall | 4-1 | Capital One Cup |
| 01/03/2016 | Carrow Road | Norwich City | 2-1 | Premier League |
| 25/04/2017 | Stamford Bridge | Southampton | 4-2 | Premier League |
| 15/05/2017 | Stamford Bridge | Watford | 4-3 | Premier League |
| 09/09/2017 | King Power Stadium | Leicester City | 2-1 | Premier League |
| 20/12/2017 | Stamford Bridge | Bournemouth | 2-1 | Carabao Cup |
| 12/02/2018 | Stamford Bridge | West Bromwich Albion | 3-0 | Premier League |
| 09/05/2018 | Stamford Bridge | Huddersfield Town | 1-1 | Premier League |
| 01/09/2018 | Stamford Bridge | Bournemouth | 2-0 | Premier League |
| 29/09/2020 | Tottenham Hotspur Stadium | Tottenham Hotspur | 1-1 | Carabao Cup |