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Chelsea matches where William S Castle was referee
| Date | Venue | Opponent | Score | Comp |
| 24/09/1969 | Elland Road | Leeds United | 1-1 | League Cup |
| 06/12/1969 | Old Trafford | Manchester United | 2-0 | Football League Division 1 |
| 16/09/1972 | Bramall Lane | Sheffield United | 1-2 | Football League Division 1 |
| 03/11/1973 | Old Trafford | Manchester United | 2-2 | Football League Division 1 |