Southern Football League Tables
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Southern Football League English Section 1920/21
| Pos | Club | Pld | W | D | L | F | A | GA | Pts | Notes |
| 1st | Brighton & Hove Albion Reserves | 24 | 16 | 3 | 5 | 65 | 29 | 2.241 | 35 | Champions |
| 2nd | Portsmouth Reserves | 24 | 13 | 7 | 4 | 44 | 20 | 2.200 | 33 | Runners Up |
| 3rd | Millwall Reserves | 24 | 12 | 4 | 8 | 46 | 24 | 1.917 | 28 | - |
| 4th | Southampton Reserves | 24 | 10 | 7 | 7 | 53 | 35 | 1.514 | 27 | - |
| 5th | Boscambe | 24 | 10 | 6 | 8 | 25 | 40 | 0.625 | 26 | - |
| 6th | Reading Reserves | 24 | 11 | 3 | 10 | 41 | 34 | 1.206 | 25 | - |
| 7th | Luton Town Reserves | 24 | 8 | 8 | 8 | 38 | 35 | 1.086 | 24 | - |
| 8th | Charlton Athletic | 24 | 8 | 8 | 8 | 41 | 41 | 1.000 | 24 | ▲Elected to FL |
| 9th | Watford Reserves | 24 | 9 | 4 | 11 | 43 | 45 | 0.956 | 22 | - |
| 10th | Norwich City Reserves | 24 | 7 | 7 | 10 | 31 | 39 | 0.795 | 21 | - |
| 11th | Gillingham Reserves | 24 | 6 | 5 | 13 | 32 | 47 | 0.681 | 17 | - |
| 12th | Chatham Town | 24 | 5 | 6 | 13 | 24 | 47 | 0.511 | 16 | Resigned |
| 13th | Thornycrofts | 24 | 4 | 6 | 14 | 29 | 76 | 0.382 | 14 | Resigned |
Southern Football League Welsh Section 1920/21
| Pos | Club | Pld | W | D | L | F | A | GA | Pts | Notes |
| 1st | Barry | 20 | 13 | 4 | 3 | 35 | 12 | 2.917 | 30 | Champions |
| 2nd | Aberdare Athletic | 20 | 12 | 3 | 5 | 29 | 23 | 1.261 | 27 | ▲Elected to FL |
| 3rd | Ebbw Vale | 20 | 10 | 5 | 5 | 34 | 23 | 1.478 | 25 | - |
| 4th | Pontypridd | 20 | 10 | 3 | 7 | 34 | 23 | 1.478 | 23 | - |
| 5th | Mid Rhondda | 20 | 10 | 3 | 7 | 26 | 18 | 1.444 | 23 | Resigned |
| 6th | Abertillery | 20 | 8 | 5 | 7 | 35 | 24 | 1.458 | 21 | - |
| 7th | Ton Pentre | 20 | 7 | 5 | 8 | 32 | 34 | 0.941 | 19 | - |
| 8th | Aberaman Athletic | 20 | 5 | 7 | 8 | 30 | 33 | 0.909 | 17 | - |
| 9th | LIanelly | 20 | 7 | 2 | 11 | 28 | 46 | 0.609 | 16 | Resigned |
| 10th | Mardy | 20 | 2 | 6 | 12 | 18 | 39 | 0.462 | 10 | - |
| 11th | Porth Athletic | 20 | 3 | 3 | 14 | 28 | 54 | 0.519 | 9 | - |
Southern Football League - End of Season Notes
|
Teams Leaving the Southern Football League |
| ▲Aberdare Athletic were Elected to the Football League Third Division South |
| ▲Charlton Athletic were Elected to the Football League Third Division South |
| ▼Chatham Town Resigned from the League |
| ▼LIanelly Resigned from the League and joined the Welsh National League South |
| ▼Mid Rhondda Resigned from the League |
| ▼Thorneycrofts Resigned from the League |
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|
Teams Joining the Southern Football League |
| ▲Bath City were placed in the English Section |
| ▲Bristol City Reserves were placed in the English Section |
| ▲Bristol Rovers Reserves were placed in the English Section |
| ▲Charlton Athletic Reserves were placed in the English Section |
| ▲Exeter City Reserves were placed in the English Section |
| ▲Guildford United were placed in the English Section |
| ▲Plymouth Argyle Reserves were placed in the English Section |
| ▲Southend United Reserves were placed in the English Section |
| ▲Swansea Town Reserves were placed in the Welsh Section |
| ▲Swindon Town Reserves were placed in the English Section |
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