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Chelsea matches where Len Howarth was referee
| Date | Venue | Opponent | Score | Comp |
| 23/08/1954 | Stamford Bridge | Burnley | 1-0 | Football League Division 1 |
| 31/08/1954 | Turf Moor | Burnley | 1-1 | Football League Division 1 |
| 16/11/1957 | Roker Park | Sunderland | 2-2 | Football League Division 1 |
| 23/08/1958 | Old Trafford | Manchester United | 2-5 | Football League Division 1 |
| 30/03/1959 | Stamford Bridge | Blackpool | 3-1 | Football League Division 1 |