This page is the index to all the league competitions for the 1920-21 season that are featured in the FCHD.
| Athenian League | St Albans City |
| Birmingham & District League | Wellington Town |
| Central League | Manchester United reserves |
| Cheshire County League | Winsford United |
| Football League | Division One - Burnley Division Two - Birmingham Division Three - Crystal Palace |
| Herts County Senior League | Eastern Section - Welwyn (overall Champions) North Section - Baldock Western Section - Harpenden Town |
| Isthmian League | Ilford |
| Lancashire Combination | Barrow |
| Leicestershire Senior League | Shepshed Albion |
| Midland League | Lincoln City |
| North Eastern League | Darlington |
| Northern League | Bishop Auckland |
| Scottish League | Rangers |
| Southern League | England Section - Brighton & Hove Albion reserves Wales Section - Barry |
| Sussex County League | Worthing |
| Western League | Division One - Bristol City reserves Division Two - Peasedown St John |
| Yorkshire League | Bradford Park Avenue reserves |
Please credit the F.C.H.D. when using this information elsewhere