# 2021–22 Thai League 3

The 2021–22 Thai League 3 is the fifth season of the Thai League 3, the third-tier professional league for association football clubs in Thailand, since its establishment in 2017, also known as Blue Dragon League due to the sponsorship deal with Blue Dragon Lottery Online. A total of 75 teams would be divided into 6 regions including 12 teams in the Northern region, 13 teams in the Northeastern region, 12 teams in the Eastern region, 11 teams in the Western region, 13 teams in the Southern region, and 14 teams in the Bangkok metropolitan region.

## Regional stage

The number of teams in 6 regions including 12 teams in the Northern region, 13 teams in the Northeastern region, 12 teams in the Eastern region, 11 teams in the Western region, 13 teams in the Southern region, and 14 teams in the Bangkok metropolitan region.

### Northern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Uthai Thani (C, Q) | 22 | 18 | 2 | 2 | 63 | 11 | +52 | 56 | Qualification to the National Championship stage |
| 2 | Phitsanulok (Q) | 22 | 11 | 8 | 3 | 28 | 15 | +13 | 41 | Qualification to the National Championship stage |
| 3 | Maejo United | 22 | 11 | 5 | 6 | 23 | 21 | +2 | 38 | |
| 4 | Wat Bot City | 22 | 8 | 11 | 3 | 26 | 26 | 0 | 35 | |
| 5 | See Khwae City | 22 | 10 | 5 | 7 | 27 | 23 | +4 | 35 | |
| 6 | Chiangrai City | 22 | 8 | 10 | 4 | 19 | 14 | +5 | 34 | |
| 7 | Uttaradit | 22 | 7 | 7 | 8 | 27 | 22 | +5 | 28 | |
| 8 | Nakhon Mae Sot United | 22 | 5 | 5 | 12 | 13 | 22 | −9 | 20 | |
| 9 | Kamphaengphet | 22 | 4 | 7 | 11 | 18 | 35 | −17 | 19 | |
| 10 | Chiangrai Lanna | 22 | 4 | 6 | 12 | 16 | 38 | −22 | 18 | |
| 11 | Nan | 22 | 4 | 5 | 13 | 18 | 33 | −15 | 17 | |
| 12 | Northern Tak United (R) | 22 | 3 | 7 | 12 | 16 | 34 | −18 | 16 | Relegation to the Thailand Amateur League |
* 1 2 Wat Bot City ahead on head-to-head points record; Wat Bot City 4 pts, See Khwae City 1 pt.

### Northeastern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Muang Loei United (C, Q) | 24 | 18 | 4 | 2 | 59 | 15 | +44 | 58 | Qualification to the National Championship stage |
| 2 | Sisaket (Q) | 24 | 17 | 2 | 5 | 52 | 28 | +24 | 53 | Qualification to the National Championship stage |
| 3 | Nakhon Ratchasima United | 24 | 15 | 6 | 3 | 43 | 21 | +22 | 51 | |
| 4 | Ubon Kruanapat | 24 | 13 | 3 | 8 | 45 | 25 | +20 | 42 | |
| 5 | Sisaket United | 24 | 11 | 7 | 6 | 50 | 30 | +20 | 40 | |
| 6 | Surin City | 24 | 10 | 2 | 12 | 49 | 47 | +2 | 32 | |
| 7 | Mahasarakham | 24 | 9 | 5 | 10 | 30 | 32 | −2 | 32 | |
| 8 | Sakon Nakhon | 24 | 8 | 8 | 8 | 38 | 35 | +3 | 32 | |
| 9 | Yasothon | 24 | 5 | 12 | 7 | 23 | 30 | −7 | 27 | |
| 10 | Khon Kaen Mordindang | 24 | 7 | 4 | 13 | 24 | 45 | −21 | 25 | |
| 11 | Udon United | 24 | 6 | 7 | 11 | 27 | 33 | −6 | 25 | |
| 12 | Surin Khong Chee Mool | 24 | 1 | 8 | 15 | 22 | 57 | −35 | 11 | |
| 13 | Mashare Chaiyaphum (R) | 24 | 0 | 4 | 20 | 12 | 76 | −64 | 4 | Relegation to the Thailand Amateur League |
* 1 2 3 The head-to-head points record (mini-league); Surin City 6 pts, Mahasarakham 5 pts (GD -1), Sakon Nakhon 5 pts (GD -2).
* 1 2 Khon Kaen Mordindang ahead on head-to-head points record; Khon Kaen Mordindang 6 pts, Udon United 0 pts.

### Eastern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Pattaya Dolphins United (C, Q) | 22 | 16 | 5 | 1 | 62 | 14 | +48 | 53 | Qualification to the National Championship stage |
| 2 | Chachoengsao Hi-Tek (Q) | 22 | 13 | 6 | 3 | 34 | 17 | +17 | 45 | Qualification to the National Championship stage |
| 3 | Pluakdaeng United | 22 | 12 | 4 | 6 | 29 | 23 | +6 | 40 | |
| 4 | Bankhai United | 22 | 10 | 9 | 3 | 37 | 22 | +15 | 39 | |
| 5 | Saimit Kabin United | 22 | 10 | 7 | 5 | 34 | 27 | +7 | 37 | |
| 6 | Assawin Kohkwang United | 22 | 8 | 8 | 6 | 29 | 24 | +5 | 32 | |
| 7 | ACDC | 22 | 8 | 8 | 6 | 30 | 33 | −3 | 32 | |
| 8 | Chanthaburi | 22 | 4 | 7 | 11 | 28 | 38 | −10 | 19 | |
| 9 | Sakaeo (R) | 22 | 4 | 5 | 13 | 18 | 35 | −17 | 17 | Relegation to Thailand Amateur League |
| 10 | Banbueng | 22 | 3 | 7 | 12 | 22 | 38 | −16 | 16 | |
| 11 | Marines Eureka | 22 | 4 | 3 | 15 | 12 | 36 | −24 | 15 | |
| 12 | Royal Thai Fleet (R) | 22 | 4 | 3 | 15 | 21 | 49 | −28 | 15 | Relegation to the Thailand Amateur League |
* 1 2 Assawin Kohkwang United ahead on head-to-head points record; Assawin Kohkwang United 6 pts, ACDC 0 pts.
* ↑ Sakaeo administratively relegated to 2023 Thailand Amateur League by FA Thailand decision because of the failure about club licensing.
* 1 2 The head-to-head record was a tie, Marines Eureka ahead on overall goals difference.

### Western region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Saraburi United (C, Q) | 20 | 14 | 3 | 3 | 36 | 17 | +19 | 45 | Qualification to the National Championship stage |
| 2 | Pathumthani University (Q) | 20 | 10 | 9 | 1 | 30 | 13 | +17 | 39 | Qualification to the National Championship stage |
| 3 | Hua Hin City | 20 | 10 | 3 | 7 | 31 | 19 | +12 | 33 | |
| 4 | Kanchanaburi | 20 | 9 | 4 | 7 | 28 | 29 | −1 | 31 | |
| 5 | Assumption United | 20 | 8 | 4 | 8 | 28 | 25 | +3 | 28 | |
| 6 | Angthong | 20 | 7 | 6 | 7 | 29 | 22 | +7 | 27 | |
| 7 | Thawi Watthana Samut Sakhon United | 20 | 8 | 1 | 11 | 22 | 32 | −10 | 25 | |
| 8 | Kanjanapat | 20 | 6 | 3 | 11 | 15 | 22 | −7 | 21 | |
| 9 | Chainat United | 20 | 3 | 10 | 7 | 17 | 28 | −11 | 19 | |
| 10 | Samut Songkhram | 20 | 5 | 4 | 11 | 17 | 32 | −15 | 19 | |
| 11 | Bang Pa-in Ayutthaya (R) | 20 | 5 | 3 | 12 | 17 | 31 | −14 | 18 | Relegation to the Thailand Amateur League |
* 1 2 The head-to-head record was a tie, Chainat United ahead on overall goals difference.

### Southern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Krabi (C, Q) | 24 | 17 | 3 | 4 | 45 | 11 | +34 | 54 | Qualification to the National Championship stage |
| 2 | Nakhon Si United (Q) | 24 | 15 | 7 | 2 | 47 | 19 | +28 | 52 | Qualification to the National Championship stage |
| 3 | Songkhla | 24 | 14 | 6 | 4 | 40 | 18 | +22 | 48 | |
| 4 | Nara United | 24 | 12 | 6 | 6 | 38 | 26 | +12 | 42 | |
| 5 | MH Khon Surat City | 24 | 12 | 4 | 8 | 28 | 18 | +10 | 40 | |
| 6 | Trang | 24 | 10 | 9 | 5 | 27 | 20 | +7 | 39 | |
| 7 | Jalor City | 24 | 7 | 11 | 6 | 25 | 30 | −5 | 32 | |
| 8 | Satun United (R) | 24 | 8 | 4 | 12 | 40 | 42 | −2 | 28 | Relegation to Thailand Amateur League |
| 9 | Young Singh Hatyai United | 24 | 7 | 6 | 11 | 18 | 23 | −5 | 27 | |
| 10 | Pattani | 24 | 6 | 8 | 10 | 27 | 29 | −2 | 26 | |
| 11 | Patong City | 24 | 5 | 5 | 14 | 18 | 32 | −14 | 20 | |
| 12 | Phatthalung | 24 | 5 | 4 | 15 | 19 | 37 | −18 | 19 | |
| 13 | Surat Thani (R) | 24 | 0 | 3 | 21 | 10 | 77 | −67 | 3 | Relegation to the Thailand Amateur League |
* ↑ Satun United administratively relegated to 2023 Thailand Amateur League by FA Thailand decision because of the failure about club licensing.

### Bangkok Metropolitan region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | North Bangkok University (C, Q) | 26 | 15 | 8 | 3 | 41 | 13 | +28 | 53 | Qualification to the National Championship stage |
| 2 | Bangkok (Q) | 26 | 15 | 8 | 3 | 55 | 19 | +36 | 53 | Qualification to the National Championship stage |
| 3 | Nonthaburi United S.Boonmeerit | 26 | 13 | 8 | 5 | 51 | 29 | +22 | 47 | |
| 4 | Chamchuri United | 26 | 12 | 10 | 4 | 44 | 23 | +21 | 46 | |
| 5 | Kasem Bundit University | 26 | 12 | 8 | 6 | 35 | 29 | +6 | 44 | |
| 6 | Siam | 26 | 8 | 11 | 7 | 26 | 32 | −6 | 35 | |
| 7 | Prime Bangkok | 26 | 9 | 7 | 10 | 27 | 30 | −3 | 34 | |
| 8 | STK Muangnont | 26 | 8 | 9 | 9 | 29 | 40 | −11 | 33 | |
| 9 | Royal Thai Army | 26 | 7 | 12 | 7 | 24 | 23 | +1 | 33 | |
| 10 | Royal Thai Air Force | 26 | 8 | 7 | 11 | 23 | 30 | −7 | 31 | |
| 11 | Thonburi United | 26 | 5 | 13 | 8 | 32 | 33 | −1 | 28 | |
| 12 | Inter Bangkok | 26 | 3 | 7 | 16 | 16 | 60 | −44 | 16 | |
| 13 | Samut Prakan | 26 | 1 | 12 | 13 | 23 | 38 | −15 | 15 | |
| 14 | Grakcu Sai Mai United (R) | 26 | 3 | 6 | 17 | 27 | 54 | −27 | 15 | Relegation to the Thailand Amateur League |
* 1 2 North Bangkok University ahead on head-to-head points record; North Bangkok University 4 pts, Bangkok 1 pt.
* 1 2 STK Muangnont ahead on head-to-head points record; STK Muangnont 4 pts, Royal Thai Army 1 pt.
* 1 2 The head-to-head record was a tie, Samut Prakan ahead on overall goals difference.

## National Championship stage

The national championship stage is the next stage from the regional stage. 1st and 2nd places of each zone qualified for this stage by being featured in 2 groups. Teams from the Northern, Northeastern, and Eastern regions would have qualified for the upper group. Meanwhile, teams from the Western, Southern, and Bangkok Metropolitan regions would have qualified for the lower group. Winners, runners-ups, and third-placed of the national championship stage would be promoted to the 2022–23 Thai League 2.

### Group stage

    Upper region
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification | UTT | PLK | PAT | MLU | SKT | CCH |
| 1 | Uthai Thani (C, P) | 5 | 4 | 0 | 1 | 14 | 6 | +8 | 12 | Qualification to the final and promotion to the 2022–23 Thai League 2 | — | — | 4–1 | — | 6–2 | 3–1 |
| 2 | Phitsanulok | 5 | 4 | 0 | 1 | 9 | 4 | +5 | 12 | Qualification to the third place play-off | 2–0 | — | — | — | — | 3–1 |
| 3 | Pattaya Dolphins United | 5 | 4 | 0 | 1 | 11 | 8 | +3 | 12 | | — | 2–0 | — | 2–1 | 4–3 | — |
| 4 | Muang Loei United | 5 | 1 | 0 | 4 | 5 | 7 | −2 | 3 | | 0–1 | 0–1 | — | — | 2–0 | — |
| 5 | Sisaket | 5 | 1 | 0 | 4 | 8 | 15 | −7 | 3 | | — | 1–3 | — | — | — | 2–0 |
| 6 | Chachoengsao Hi-Tek | 5 | 1 | 0 | 4 | 5 | 12 | −7 | 3 | | — | — | 0–2 | 3–2 | — | — |
* 1 2 3 The head-to-head points record (mini-league); Uthai Thani 3 pts (GD +1), Phitsanulok 3 pts (GD 0), Pattaya Dolphins United 3 pts (GD -1).
* 1 2 3 The head-to-head points record (mini-league); Muang Loei United 3 pts (GD +1), Sisaket 3 pts (GD 0), Chachoengsao Hi-Tek 3 pts (GD -1).
    Lower region
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification | KBI | NSU | NBU | SRU | PTU | BKK |
| 1 | Krabi (P) | 5 | 3 | 1 | 1 | 8 | 6 | +2 | 10 | Qualification to the final and promotion to the 2022–23 Thai League 2 | — | 0–0 | 2–1 | — | — | 1–2 |
| 2 | Nakhon Si United (O, P) | 5 | 2 | 3 | 0 | 9 | 2 | +7 | 9 | Qualification to the third place play-off | — | — | — | — | 3–0 | 5–1 |
| 3 | North Bangkok University | 5 | 2 | 2 | 1 | 5 | 2 | +3 | 8 | | — | 0–0 | — | 0–0 | — | 3–0 |
| 4 | Saraburi United | 5 | 2 | 2 | 1 | 6 | 5 | +1 | 8 | | 2–3 | 1–1 | — | — | 2–1 | — |
| 5 | Pathumthani University | 5 | 1 | 0 | 4 | 6 | 8 | −2 | 3 | | 1–2 | — | 0–1 | — | — | — |
| 6 | Bangkok | 5 | 1 | 0 | 4 | 3 | 14 | −11 | 3 | | — | — | — | 0–1 | 0–4 | — |
* 1 2 The head-to-head record was a tie, North Bangkok University ahead on overall goals difference.
* 1 2 Pathumthani University ahead on head-to-head points record; Pathumthani University 3 pts, Bangkok 0 pts.

### Knockout stage

    Third place play-off
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Phitsanulok | 3–4 | Nakhon Si United | 1–1 | 2–3 |
    Final
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Uthai Thani | 3–1 | Krabi | 2–0 | 1–1 |