| 1 | |  Nongbua Pitchaya FC | 33 | 20 | 12 | 1 | 60 | 16 | 44 | 72 | B15:00 | 14/03/21 | R 29  Sisaket FC 0 Nongbua Pitchaya FC 0 G15:00 | 17/03/21 | R 30 Nongbua Pitchaya FC 1 Udon Thani FC 0 G14:00 | 20/03/21 | R 31 Khon Kaen United FC 1 Nongbua Pitchaya FC 3 G14:00 | 24/03/21 | R 32 Nongbua Pitchaya FC 6 Customs Ladkrabang United FC 0 M15:00 | 27/03/21 | R 33 Nongbua Pitchaya FC 1 Navy Football Club 2 G14:00 | 31/03/21 | R 34 Kasetsart FC 0 Nongbua Pitchaya FC 3 |
| 2 | |  Chiangmai United | 33 | 20 | 9 | 4 | 62 | 25 | 37 | 69 | G13:00 | 13/03/21 | R 29 Chiangmai United 2 Ranong United 0 G15:00 | 17/03/21 | R 30 Ayutthaya United FC 0 Chiangmai United 1 G15:00 | 20/03/21 | R 31 Chiangmai United 4 Navy Football Club 1 M15:00 | 24/03/21 | R 32 Lampang FC 3 Chiangmai United 1 B14:00 | 28/03/21 | R 33 Chiangmai United 0 Chiangmai FC 0 M14:00 | 31/03/21 | R 34 Nakhon Pathom United FC 3 Chiangmai United 2 |
| 3 | |  Khon Kaen United FC | 33 | 18 | 6 | 9 | 56 | 34 | 22 | 60 | G15:00 | 28/03/21 | R 33 Khon Kaen United FC 1 Ranong United 0 M14:00 | 31/03/21 | R 34 Lampang FC 3 Khon Kaen United FC 0 G15:00 | 04/04/21 | R semifinal Phrae United 1 Khon Kaen United FC 3 G15:00 | 10/04/21 | R semifinal Khon Kaen United FC 2 Phrae United 1 G14:00 | 17/04/21 | R final Khon Kaen United FC 2 Nakhon Pathom United FC 1 B14:00 | 24/04/21 | R final Nakhon Pathom United FC (2) 2 Khon Kaen United FC (3) 1 |
| 4 | |  Nakhon Pathom United FC | 33 | 16 | 10 | 7 | 63 | 34 | 29 | 58 | B15:00 | 27/03/21 | R 33 Ayutthaya United FC 1 Nakhon Pathom United FC 1 G14:00 | 31/03/21 | R 34 Nakhon Pathom United FC 3 Chiangmai United 2 G15:00 | 04/04/21 | R semifinal Chainat Hornbill FC 1 Nakhon Pathom United FC 2 G15:00 | 10/04/21 | R semifinal Nakhon Pathom United FC 2 Chainat Hornbill FC 0 M14:00 | 17/04/21 | R final Khon Kaen United FC 2 Nakhon Pathom United FC 1 B14:00 | 24/04/21 | R final Nakhon Pathom United FC (2) 2 Khon Kaen United FC (3) 1 |
| 5 | |  Chainat Hornbill FC | 33 | 16 | 9 | 8 | 60 | 45 | 15 | 57 | G15:00 | 21/03/21 | R 31 Chainat Hornbill FC 2 Kasetsart FC 0 G13:00 | 24/03/21 | R 32 Navy Football Club 0 Chainat Hornbill FC 1 G15:00 | 27/03/21 | R 33 Chainat Hornbill FC 2 Khon Kaen FC 0 M14:00 | 31/03/21 | R 34 Phrae United 2 Chainat Hornbill FC 1 M15:00 | 04/04/21 | R semifinal Chainat Hornbill FC 1 Nakhon Pathom United FC 2 M15:00 | 10/04/21 | R semifinal Nakhon Pathom United FC 2 Chainat Hornbill FC 0 |
| 6 | |  Phrae United | 33 | 15 | 11 | 7 | 47 | 26 | 21 | 56 | |
| 7 | |  Chiangmai FC | 33 | 15 | 8 | 10 | 53 | 44 | 9 | 53 | G13:00 | 14/03/21 | R 29 Uthai Thani FC 0 Chiangmai FC 2 G14:00 | 17/03/21 | R 30 Chiangmai FC 2 Lampang FC 0 M15:00 | 21/03/21 | R 31 Sisaket FC 2 Chiangmai FC 0 M15:00 | 24/03/21 | R 32 Chiangmai FC 1 Udon Thani FC 3 B14:00 | 28/03/21 | R 33 Chiangmai United 0 Chiangmai FC 0 G14:00 | 31/03/21 | R 34 Chiangmai FC 3 Samut Sakhon FC 1 |
| 8 | |  Ranong United | 33 | 15 | 5 | 13 | 44 | 41 | 3 | 50 | M13:00 | 13/03/21 | R 29 Chiangmai United 2 Ranong United 0 G14:00 | 17/03/21 | R 30 Ranong United 1 Chainat Hornbill FC 0 G13:00 | 20/03/21 | R 31 Customs Ladkrabang United FC 2 Ranong United 3 G15:00 | 24/03/21 | R 32 Ranong United 2 Ayutthaya United FC 0 M15:00 | 28/03/21 | R 33 Khon Kaen United FC 1 Ranong United 0 G14:00 | 31/03/21 | R 34 Ranong United 1 Sisaket FC 0 |
| 9 | |  Ayutthaya United FC | 33 | 12 | 8 | 13 | 43 | 43 | 0 | 44 | M14:00 | 13/03/21 | R 29 Chainat Hornbill FC 2 Ayutthaya United FC 0 M15:00 | 17/03/21 | R 30 Ayutthaya United FC 0 Chiangmai United 1 M15:00 | 21/03/21 | R 31 Ayutthaya United FC 1 Khon Kaen FC 2 M15:00 | 24/03/21 | R 32 Ranong United 2 Ayutthaya United FC 0 B15:00 | 27/03/21 | R 33 Ayutthaya United FC 1 Nakhon Pathom United FC 1 G14:00 | 31/03/21 | R 34 Navy Football Club 2 Ayutthaya United FC 3 |
| 10 | |  Khon Kaen FC | 33 | 11 | 8 | 14 | 34 | 37 | -3 | 41 | G14:00 | 14/03/21 | R 29 Navy Football Club 0 Khon Kaen FC 1 M13:00 | 17/03/21 | R 30 Khon Kaen FC 1 Sisaket FC 2 G15:00 | 21/03/21 | R 31 Ayutthaya United FC 1 Khon Kaen FC 2 G15:00 | 24/03/21 | R 32 Khon Kaen FC 4 Samut Sakhon FC 1 M15:00 | 27/03/21 | R 33 Chainat Hornbill FC 2 Khon Kaen FC 0 M14:00 | 31/03/21 | R 34 Khon Kaen FC 0 Customs Ladkrabang United FC 1 |
| 11 | |  Navy Football Club | 33 | 11 | 7 | 15 | 45 | 50 | -5 | 40 | M14:00 | 14/03/21 | R 29 Navy Football Club 0 Khon Kaen FC 1 G14:00 | 17/03/21 | R 30 Navy Football Club 4 Customs Ladkrabang United FC 1 M15:00 | 20/03/21 | R 31 Chiangmai United 4 Navy Football Club 1 M13:00 | 24/03/21 | R 32 Navy Football Club 0 Chainat Hornbill FC 1 G15:00 | 27/03/21 | R 33 Nongbua Pitchaya FC 1 Navy Football Club 2 M14:00 | 31/03/21 | R 34 Navy Football Club 2 Ayutthaya United FC 3 |
| 12 | |  Kasetsart FC | 33 | 11 | 5 | 17 | 36 | 50 | -14 | 38 | G15:00 | 14/03/21 | R 29 Kasetsart FC 1 Phrae United 0 G15:00 | 17/03/21 | R 30 Kasetsart FC 1 Uthai Thani FC 0 M15:00 | 21/03/21 | R 31 Chainat Hornbill FC 2 Kasetsart FC 0 M14:00 | 24/03/21 | R 32 Kasetsart FC 0 Khon Kaen United FC 1 B14:00 | 28/03/21 | R 33 Udon Thani FC 0 Kasetsart FC 0 M14:00 | 31/03/21 | R 34 Kasetsart FC 0 Nongbua Pitchaya FC 3 |
| 13 | |  Lampang FC | 33 | 10 | 7 | 16 | 36 | 46 | -10 | 37 | B15:00 | 13/03/21 | R 29 Lampang FC 0 Udon Thani FC 0 M14:00 | 17/03/21 | R 30 Chiangmai FC 2 Lampang FC 0 G14:00 | 20/03/21 | R 31 Samut Sakhon FC 1 Lampang FC 7 G15:00 | 24/03/21 | R 32 Lampang FC 3 Chiangmai United 1 M14:00 | 28/03/21 | R 33 Sisaket FC 3 Lampang FC 0 G14:00 | 31/03/21 | R 34 Lampang FC 3 Khon Kaen United FC 0 |
| 14 | |  Customs Ladkrabang United FC | 33 | 10 | 6 | 17 | 36 | 62 | -26 | 36 | G15:00 | 13/03/21 | R 29 Samut Sakhon FC 0 Customs Ladkrabang United FC 3 M14:00 | 17/03/21 | R 30 Navy Football Club 4 Customs Ladkrabang United FC 1 M13:00 | 20/03/21 | R 31 Customs Ladkrabang United FC 2 Ranong United 3 M14:00 | 24/03/21 | R 32 Nongbua Pitchaya FC 6 Customs Ladkrabang United FC 0 B14:00 | 27/03/21 | R 33 Customs Ladkrabang United FC 1 Phrae United 1 G14:00 | 31/03/21 | R 34 Khon Kaen FC 0 Customs Ladkrabang United FC 1 |
| 15 | |  Sisaket FC | 33 | 9 | 9 | 15 | 34 | 43 | -9 | 36 | B15:00 | 14/03/21 | R 29 Sisaket FC 0 Nongbua Pitchaya FC 0 G13:00 | 17/03/21 | R 30 Khon Kaen FC 1 Sisaket FC 2 G15:00 | 21/03/21 | R 31 Sisaket FC 2 Chiangmai FC 0 B14:00 | 24/03/21 | R 32 Phrae United 2 Sisaket FC 2 G14:00 | 28/03/21 | R 33 Sisaket FC 3 Lampang FC 0 M14:00 | 31/03/21 | R 34 Ranong United 1 Sisaket FC 0 |
| 16 | |  Udon Thani FC | 33 | 8 | 11 | 14 | 42 | 45 | -3 | 35 | B15:00 | 13/03/21 | R 29 Lampang FC 0 Udon Thani FC 0 M15:00 | 17/03/21 | R 30 Nongbua Pitchaya FC 1 Udon Thani FC 0 G13:00 | 21/03/21 | R 31 Udon Thani FC 2 Nakhon Pathom United FC 1 G15:00 | 24/03/21 | R 32 Chiangmai FC 1 Udon Thani FC 3 B14:00 | 28/03/21 | R 33 Udon Thani FC 0 Kasetsart FC 0 G14:00 | 31/03/21 | R 34 Uthai Thani FC 1 Udon Thani FC 2 |
| 17 | |  Uthai Thani FC | 33 | 5 | 10 | 18 | 33 | 51 | -18 | 25 | M13:00 | 14/03/21 | R 29 Uthai Thani FC 0 Chiangmai FC 2 M15:00 | 17/03/21 | R 30 Kasetsart FC 1 Uthai Thani FC 0 M15:00 | 21/03/21 | R 31 Uthai Thani FC 1 Phrae United 2 M14:00 | 24/03/21 | R 32 Nakhon Pathom United FC 4 Uthai Thani FC 2 G13:00 | 27/03/21 | R 33 Samut Sakhon FC 0 Uthai Thani FC 4 M14:00 | 31/03/21 | R 34 Uthai Thani FC 1 Udon Thani FC 2 |
| 18 | |  Samut Sakhon FC | 33 | 2 | 5 | 26 | 24 | 116 | -92 | 11 | M15:00 | 13/03/21 | R 29 Samut Sakhon FC 0 Customs Ladkrabang United FC 3 M14:00 | 17/03/21 | R 30 Nakhon Pathom United FC 6 Samut Sakhon FC 0 M14:00 | 20/03/21 | R 31 Samut Sakhon FC 1 Lampang FC 7 M15:00 | 24/03/21 | R 32 Khon Kaen FC 4 Samut Sakhon FC 1 M13:00 | 27/03/21 | R 33 Samut Sakhon FC 0 Uthai Thani FC 4 M14:00 | 31/03/21 | R 34 Chiangmai FC 3 Samut Sakhon FC 1 |
