# 2020–21 Thai League 3

The 2020–21 Thai League 3 is the fourth 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 Omsin League Regional Championship due to the sponsorship deal with Government Savings Bank (Omsin Bank). Due to the COVID-19 pandemic in Thailand, the season must be postponed to start in late 2020 and end in early 2021. In addition, the Thai League 4 had combined with the Thai League 3 and compete as Thai League 3 since this season and there is no relegation in this season. A total of 72 teams would be divided into 6 regions including 11 teams in the Northern region, 11 teams in the Northeastern region, 12 teams in the Eastern region, 12 teams in the Western region, 12 teams in the Southern region, and 14 teams in the Bangkok metropolitan region.

## Regional stage

The number of teams in 6 regions including 11 teams in the Northern region, 11 teams in the Northeastern region, 12 teams in the Eastern region, 12 teams in the Western region, 12 teams in the Southern region, and 14 teams in the Bangkok metropolitan region.
The winners and runners-up of each region will advance to the national championship stage to finding 3 teams promoted to the 2021–22 Thai League 2.
In late December 2020, the COVID-19 had spread again in Thailand, the FA Thailand must abruptly end the regional stage of the Thai League 3.

### Northern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Lamphun Warriors (Q) | 15 | 13 | 0 | 2 | 31 | 6 | +25 | 39 | Qualification to the National Championship stage |
| 2 | Maejo United | 15 | 10 | 3 | 2 | 23 | 8 | +15 | 33 | Qualification to the National Championship stage play-offs |
| 3 | Phitsanulok (O, Q) | 14 | 10 | 2 | 2 | 25 | 8 | +17 | 32 | Qualification to the National Championship stage play-offs |
| 4 | Uttaradit | 15 | 8 | 1 | 6 | 22 | 18 | +4 | 25 | |
| 5 | Wat Bot City | 16 | 8 | 0 | 8 | 25 | 17 | +8 | 24 | |
| 6 | See Khwae City | 16 | 6 | 3 | 7 | 19 | 25 | −6 | 21 | |
| 7 | Nan | 15 | 5 | 4 | 6 | 16 | 19 | −3 | 19 | |
| 8 | Chiangrai City | 14 | 3 | 4 | 7 | 13 | 21 | −8 | 13 | |
| 9 | Kamphaengphet | 15 | 3 | 4 | 8 | 11 | 22 | −11 | 13 | |
| 10 | Northern Tak United | 16 | 3 | 1 | 12 | 11 | 33 | −22 | 10 | |
| 11 | Chiangrai Lanna | 15 | 2 | 2 | 11 | 7 | 26 | −19 | 8 | |

### Northeastern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Udon United (Q) | 16 | 15 | 1 | 0 | 63 | 17 | +46 | 46 | Qualification to the National Championship stage |
| 2 | Muang Loei United (Q) | 15 | 12 | 1 | 2 | 35 | 9 | +26 | 37 | Qualification to the National Championship stage |
| 3 | Yasothon | 15 | 8 | 3 | 4 | 21 | 13 | +8 | 27 | |
| 4 | Ubon Kruanapat | 15 | 8 | 3 | 4 | 25 | 21 | +4 | 27 | |
| 5 | Surin City | 16 | 5 | 3 | 8 | 23 | 30 | −7 | 18 | |
| 6 | Nakhon Ratchasima United | 16 | 4 | 4 | 8 | 25 | 38 | −13 | 16 | |
| 7 | Surin Khong Chee Mool | 16 | 3 | 6 | 7 | 25 | 33 | −8 | 15 | |
| 8 | Chaiyaphum United | 15 | 2 | 8 | 5 | 16 | 24 | −8 | 14 | |
| 9 | Khon Kaen Mordindang | 15 | 3 | 3 | 9 | 18 | 28 | −10 | 12 | |
| 10 | Sakon Nakhon | 16 | 2 | 6 | 8 | 15 | 25 | −10 | 12 | |
| 11 | Mahasarakham | 15 | 3 | 2 | 10 | 17 | 45 | −28 | 11 | |

### Eastern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Pluakdaeng United (Q) | 17 | 12 | 3 | 2 | 43 | 15 | +28 | 39 | Qualification to the National Championship stage |
| 2 | Chachoengsao Hi-Tek (Q) | 17 | 11 | 5 | 1 | 37 | 9 | +28 | 38 | Qualification to the National Championship stage |
| 3 | Bankhai United | 16 | 10 | 1 | 5 | 33 | 16 | +17 | 31 | |
| 4 | Banbueng | 16 | 7 | 4 | 5 | 29 | 28 | +1 | 25 | |
| 5 | Saimit Kabin United | 17 | 6 | 7 | 4 | 13 | 17 | −4 | 25 | |
| 6 | Marines Eureka | 17 | 7 | 3 | 7 | 21 | 22 | −1 | 24 | |
| 7 | Assawin Kohkwang United | 16 | 6 | 3 | 7 | 23 | 28 | −5 | 21 | |
| 8 | Pattaya Discovery United | 16 | 4 | 5 | 7 | 21 | 34 | −13 | 17 | |
| 9 | ACDC | 16 | 4 | 3 | 9 | 15 | 22 | −7 | 15 | |
| 10 | Sakaeo | 15 | 3 | 4 | 8 | 16 | 29 | −13 | 13 | |
| 11 | Chanthaburi | 16 | 2 | 5 | 9 | 13 | 26 | −13 | 11 | |
| 12 | Royal Thai Fleet | 17 | 2 | 5 | 10 | 13 | 31 | −18 | 11 | |

### Western region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Muangkan United (Q) | 17 | 13 | 3 | 1 | 50 | 13 | +37 | 42 | Qualification to the National Championship stage |
| 2 | Rajpracha (Q) | 17 | 12 | 3 | 2 | 40 | 10 | +30 | 39 | Qualification to the National Championship stage |
| 3 | Angthong | 17 | 12 | 2 | 3 | 36 | 10 | +26 | 38 | |
| 4 | Singha Golden Bells Kanchanaburi | 17 | 6 | 6 | 5 | 19 | 22 | −3 | 24 | |
| 5 | Bang Pa-in Ayutthaya | 16 | 7 | 2 | 7 | 21 | 17 | +4 | 23 | |
| 6 | Assumption United | 17 | 6 | 2 | 9 | 19 | 20 | −1 | 20 | |
| 7 | Pathumthani University | 17 | 6 | 2 | 9 | 14 | 23 | −9 | 20 | |
| 8 | Saraburi United | 17 | 4 | 7 | 6 | 19 | 34 | −15 | 19 | |
| 9 | Hua Hin City | 17 | 4 | 5 | 8 | 16 | 27 | −11 | 17 | |
| 10 | Samut Songkhram | 16 | 4 | 5 | 7 | 12 | 23 | −11 | 17 | |
| 11 | Kanjanapat | 17 | 3 | 3 | 11 | 9 | 33 | −24 | 12 | |
| 12 | Thawi Watthana Samut Sakhon United | 17 | 3 | 2 | 12 | 15 | 38 | −23 | 11 | |

### Southern region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | Songkhla (Q) | 16 | 12 | 1 | 3 | 29 | 16 | +13 | 37 | Qualification to the National Championship stage |
| 2 | Krabi (Q) | 17 | 10 | 5 | 2 | 43 | 17 | +26 | 35 | Qualification to the National Championship stage |
| 3 | Nara United | 17 | 9 | 4 | 4 | 30 | 15 | +15 | 31 | |
| 4 | Nakhon Si United | 16 | 9 | 2 | 5 | 30 | 17 | +13 | 29 | |
| 5 | Pattani | 16 | 7 | 7 | 2 | 19 | 7 | +12 | 28 | |
| 6 | Trang | 16 | 7 | 5 | 4 | 19 | 13 | +6 | 26 | |
| 7 | Jalor City | 17 | 6 | 4 | 7 | 20 | 24 | −4 | 22 | |
| 8 | Surat Thani City | 17 | 5 | 5 | 7 | 17 | 23 | −6 | 20 | |
| 9 | Satun United | 17 | 5 | 4 | 8 | 29 | 23 | +6 | 19 | |
| 10 | Patong City | 17 | 3 | 2 | 12 | 16 | 36 | −20 | 11 | |
| 11 | Surat Thani | 16 | 3 | 1 | 12 | 11 | 53 | −42 | 10 | |
| 12 | Phatthalung | 16 | 3 | 0 | 13 | 15 | 34 | −19 | 9 | |

### Bangkok Metropolitan region

    League table
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification or relegation |
| 1 | North Bangkok University (Q) | 20 | 14 | 4 | 2 | 39 | 10 | +29 | 46 | Qualification to the National Championship stage |
| 2 | Nonthaburi United S.Boonmeerit | 20 | 13 | 5 | 2 | 41 | 18 | +23 | 44 | Qualification to the National Championship stage play-offs |
| 3 | Bangkok (O, Q) | 20 | 13 | 5 | 2 | 40 | 18 | +22 | 44 | Qualification to the National Championship stage play-offs |
| 4 | Chamchuri United | 20 | 10 | 6 | 4 | 43 | 20 | +23 | 36 | |
| 5 | Prime Bangkok | 20 | 8 | 9 | 3 | 26 | 24 | +2 | 33 | |
| 6 | STK Muangnont | 20 | 9 | 4 | 7 | 26 | 19 | +7 | 31 | |
| 7 | Kasem Bundit University | 20 | 8 | 5 | 7 | 31 | 32 | −1 | 29 | |
| 8 | Thonburi United | 20 | 7 | 7 | 6 | 31 | 25 | +6 | 28 | |
| 9 | Grakcu Sai Mai United | 20 | 6 | 5 | 9 | 20 | 26 | −6 | 23 | |
| 10 | Royal Thai Army | 20 | 5 | 7 | 8 | 18 | 33 | −15 | 22 | |
| 11 | Royal Thai Air Force | 20 | 5 | 3 | 12 | 19 | 43 | −24 | 18 | |
| 12 | Samut Prakan | 20 | 2 | 6 | 12 | 15 | 36 | −21 | 12 | |
| 13 | Siam | 20 | 2 | 3 | 15 | 19 | 41 | −22 | 9 | |
| 14 | Inter Bangkok | 20 | 1 | 5 | 14 | 12 | 35 | −23 | 8 | |

## 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 featured in 2 groups. Teams from Northern, Northeastern, and Eastern regions would have qualified to the upper group. Meanwhile, teams from Western, Southern, and Bangkok Metropolitan regions would have qualified to the lower group. Winners, runners-ups, and third-placed of the national championship stage would be promoted to the 2021–22 Thai League 2.

### Play-off round

| Team 1 | Score | Team 2 |
| Northern region |||
| Maejo United | 1–2 | Phitsanulok |
| Bangkok metropolitan region |||
| Nonthaburi United S.Boonmeerit | 2–6 | Bangkok |

### Group stage

    Upper region
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification | LPW | UDU | CCH | PDU | PLK | MLU |
| 1 | Lamphun Warriors (C, P) | 5 | 4 | 0 | 1 | 8 | 5 | +3 | 12 | Qualification to the final and promotion to the 2021–22 Thai League 2 | — | 0–3 | 1–0 | — | 3–0 | — |
| 2 | Udon United | 5 | 3 | 1 | 1 | 8 | 3 | +5 | 10 | Qualification to the third place play-off | — | — | 3–1 | 0–0 | 0–1 | — |
| 3 | Chachoengsao Hi-Tek | 5 | 3 | 0 | 2 | 11 | 5 | +6 | 9 | | — | — | — | 2–1 | — | 7–0 |
| 4 | Pluakdaeng United | 5 | 2 | 1 | 2 | 10 | 5 | +5 | 7 | | 1–2 | — | — | — | 4–1 | 4–0 |
| 5 | Phitsanulok | 5 | 1 | 1 | 3 | 2 | 8 | −6 | 4 | | — | — | 0–1 | — | — | 0–0 |
| 6 | Muang Loei United | 5 | 0 | 1 | 4 | 2 | 15 | −13 | 1 | | 1–2 | 1–2 | — | — | — | — |
    Lower region
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification | MKU | RAJ | KBI | SON | NBU | BKK |
| 1 | Muangkan United (P) | 5 | 3 | 2 | 0 | 7 | 1 | +6 | 11 | Qualification to the final and promotion to the 2021–22 Thai League 2 | — | 1–1 | — | 3–0 | — | 2–0 |
| 2 | Rajpracha (O, P) | 5 | 3 | 1 | 1 | 10 | 5 | +5 | 10 | Qualification to the third place play-off | — | — | — | 2–0 | 1–0 | — |
| 3 | Krabi | 5 | 2 | 1 | 2 | 6 | 6 | 0 | 7 | | 0–1 | 1–0 | — | — | — | — |
| 4 | Songkhla | 5 | 1 | 2 | 2 | 6 | 10 | −4 | 5 | | — | — | 2–2 | — | 2–1 | 2–2 |
| 5 | North Bangkok University | 5 | 1 | 1 | 3 | 3 | 5 | −2 | 4 | | 0–0 | — | 1–2 | — | — | 1–0 |
| 6 | Bangkok | 5 | 1 | 1 | 3 | 7 | 12 | −5 | 4 | | — | 3–6 | 2–1 | — | — | — |
* 1 2 North Bangkok University ahead on head-to-head record; North Bangkok University 3 pts, Bangkok 0 pts.

### Knockout stage

    Third place play-off
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Udon United | 1–2 | Rajpracha | 1–0 | 0–2 |
    Final
| Team 1 | Agg.Tooltip Aggregate score | Team 2 | 1st leg | 2nd leg |
| Lamphun Warriors | 3–2 | Muangkan United | 2–0 | 1–2 (a.e.t.) |

## Teams promoted to 2021–22 Thai League 2

   * Lamphun Warriors (champions)
   * Muangkan United (runners-up)
   * Rajpracha (Third-placed)