The1912–13 season was the eighth in the history of theIsthmian League, an Englishfootball competition.
London Caledonians were champions, winning their fourth Isthmian League title. At the end of the seasonTunbridge Wells resigned from the league and joined theSpartan League.
| Season | 1912–13 |
|---|---|
| Champions | London Caledonians |
| Matches | 110 |
| Goals | 330 (3 per match) |
1913–14 → | |
| Pos | Team | Pld | W | D | L | GF | GA | GR | Pts | Results |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | London Caledonians | 20 | 14 | 5 | 1 | 38 | 12 | 3.167 | 33 | |
| 2 | Leytonstone | 20 | 12 | 3 | 5 | 45 | 20 | 2.250 | 27 | |
| 3 | Nunhead | 20 | 12 | 3 | 5 | 36 | 23 | 1.565 | 27 | |
| 4 | Clapton | 20 | 7 | 7 | 6 | 23 | 20 | 1.150 | 21 | |
| 5 | Dulwich Hamlet | 20 | 8 | 4 | 8 | 34 | 28 | 1.214 | 20 | |
| 6 | Woking | 20 | 7 | 5 | 8 | 33 | 40 | 0.825 | 19 | |
| 7 | Oxford City | 20 | 6 | 6 | 8 | 23 | 39 | 0.590 | 18 | |
| 8 | Ilford | 20 | 6 | 5 | 9 | 27 | 37 | 0.730 | 17 | |
| 9 | Shepherd's Bush | 20 | 5 | 5 | 10 | 26 | 38 | 0.684 | 15 | |
| 10 | Tunbridge Wells | 20 | 5 | 4 | 11 | 22 | 36 | 0.611 | 14 | Resigned to theSpartan League |
| 11 | West Norwood | 20 | 3 | 3 | 14 | 23 | 37 | 0.622 | 9 |