Khon Kaen United won the play-off between the teams in 3rd to 6th place and got promoted to T1.
Thai League 2 2020/21
| Pos | Club | P | W | D | L | F | A | GD | Pts | Form |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Nongbua Pitchaya | 34 | 21 | 12 | 1 | 63 | 16 | 47 | 75 | |
| 2 |  Chiangmai United | 34 | 20 | 9 | 5 | 64 | 28 | 36 | 69 | |
| 3 |  Nakhon Pathom United | 34 | 17 | 10 | 7 | 66 | 36 | 30 | 61 | |
| 4 |  Khon Kaen United | 34 | 18 | 6 | 10 | 56 | 37 | 19 | 60 | |
| 5 |  Phrae United | 34 | 16 | 11 | 7 | 49 | 27 | 22 | 59 | |
| 6 |  Chainat Hornbill | 34 | 16 | 9 | 9 | 61 | 47 | 14 | 57 | |
| 7 |  Chiang Mai | 34 | 16 | 8 | 10 | 56 | 45 | 11 | 56 | |
| 8 |  Ranong United | 34 | 16 | 5 | 13 | 45 | 41 | 4 | 53 | |
| 9 |  Ayutthaya United | 34 | 13 | 8 | 13 | 46 | 45 | 1 | 47 | |
| 10 |  Khon Kaen | 34 | 11 | 8 | 15 | 34 | 38 | -4 | 41 | |
| 11 |  Navy | 34 | 11 | 7 | 16 | 47 | 53 | -6 | 40 | |
| 12 |  Lampang | 34 | 11 | 7 | 16 | 39 | 46 | -7 | 40 | |
| 13 |  Customs United | 34 | 11 | 6 | 17 | 37 | 62 | -25 | 39 | |
| 14 |  Udon Thani | 34 | 9 | 11 | 14 | 44 | 46 | -2 | 38 | |
| 15 |  Kasetsart | 34 | 11 | 5 | 18 | 36 | 53 | -17 | 38 | |
| 16 |  Sisaket | 34 | 9 | 9 | 16 | 34 | 44 | -10 | 36 | |
| 17 |  Uthai Thani | 34 | 5 | 10 | 19 | 34 | 53 | -19 | 25 | |
| 18 |  Samut Sakhon | 34 | 2 | 5 | 27 | 25 | 119 | -94 | 11 |