37th ABA National Championships
Location London
Year 1921
| Weight Category | Champion | Finalist |
| Under 51 kg | William Cuthbertson (United Scottish BC) | Les Tarrant (Armstrong-Siddeley ABC) |
| Under 54 kg | Les Tarrant (Armstrong-Siddeley ABC) | T Herbison (United Scottish BC) |
| Under 57 kg | George Baker (Polytechnic ABC) | John Cater (United Scottish BC) |
| Under 60 kg | G Shorter (Clapton Federation ABC) | E Fox (Polytechnic ABC) |
| Under 69 kg | Alex Ireland (United Scottish BC) | P O'Hanrahan (Polytechnic ABC) |
| Under 75 kg | Harry Mallin (Metropolitan Police ABC) | E Whitehouse (Limehouse & Poplar ABC) |
| Under 81 kg | L Collett (Surrey Commercial Docks ABC) | B Garrett (Tillings ABC) |
| Under 91 kg | Ron Rawson (Polytechnic ABC) | J Mullings (Metropolitan Police ABC) |
