| Competition: | Thai League 3 Northeastern Region |
| Season: | 2020–21 |
| Continentalcup1: | |
| Continentalcup1 Qualifiers: | Udon United Muang Loei United |
| Matches: | 85 |
| Total Goals: | 283 |
| Biggest Home Win: | 8 goals difference (3 October 2020) |
| Biggest Away Win: | 7 goals difference (27 December 2020) |
| Highest Scoring: | 11 goals (27 December 2020) |
| Longest Wins: | 9 matches Udon United |
| Longest Unbeaten: | 16 matches Udon United |
| Longest Winless: | 12 matches Chaiyaphum United |
| Longest Losses: | 6 matches Khon Kaen Mordindang |
| Prevseason: | 2019 (T3), 2019 (T4) |
| Nextseason: | 2021–22 |
The 2020–21 Thai League 3 Northeastern region is a region in the regional stage of the 2020–21 Thai League 3. Due to the COVID-19 pandemic, 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[1] and there is no relegation in this season.[2] A total of 11 teams located in Northeastern of Thailand will compete in the league of the Northeastern region.[3]
In late December 2020, COVID-19 had spread again in Thailand, the FA Thailand must abruptly end the regional stage of the Thai League 3.[4]
| Position | Province | Number | Teams | |
|---|---|---|---|---|
| 1 | 2 | Surin City and Surin Khong Chee Mool | ||
| align=center rowspan="10" | 2 | 1 | Chaiyaphum United | |
| 1 | Khon Kaen Mordindang | |||
| 1 | Muang Loei United | |||
| 1 | Mahasarakham | |||
| 1 | Nakhon Ratchasima United | |||
| 1 | Sakon Nakhon | |||
| 1 | Ubon Kruanapat | |||
| 1 | Udon United | |||
| 1 | Yasothon |
| Team | Location | Stadium | Coordinates | |
|---|---|---|---|---|
| Chaiyaphum United | Chaiyaphum Provincial Stadium | |||
| Khon Kaen Mordindang | Khon Kaen University Stadium | |||
| Mahasarakham | Mahasarakham Provincial Stadium | |||
| Muang Loei United | Loei Provincial Stadium | |||
| Nakhon Ratchasima Rajabhat University Stadium | ||||
| Sakon Nakhon | Sakon Nakhon Provincial Stadium | |||
| Surin City | Sri Narong Stadium | |||
| Surin Khong Chee Mool | Stadium of Rajamangala University of Technology Isan, Surin Campus | |||
| Ubon Kruanapat | Stadium of Ubon Ratchathani Rajabhat University, Ban Yang Noi Campus | |||
| Udon United | Stadium of Thailand National Sports University, Udon Thani Campus | |||
| Yasothon | Yasothon PAO. Stadium |
A T3 team could register four foreign players by at least one player from AFC member countries. A team can use four foreign players on the field in each game, including at least one player from the AFC member countries (3+1).
Note :
: players who released during winter transfer window;
: players who registered during winter transfer window;
↔: players who have dual nationality by half-caste or naturalization.
→: players who left club after registered during first or second leg.
| Other foreign players. | ||
| AFC quota players. | ||
| No foreign player registered. |
| Club | Leg | Player 1 | Player 2 | Player 3 |
|---|---|---|---|---|
| Chaiyaphum United | 1st | |||
| 2nd | ||||
| Khon Kaen Mordindang | 1st | |||
| 2nd | ||||
| Mahasarakham | 1st | |||
| 2nd | ||||
| Muang Loei United | 1st | |||
| 2nd | ||||
| 1st | ||||
| 2nd | ||||
| Sakon Nakhon | 1st | |||
| 2nd | ||||
| 1st | ||||
| 2nd | ||||
| Surin Khong Chee Mool | 1st | |||
| 2nd | ||||
| Ubon Kruanapat | 1st | |||
| 2nd | ||||
| Udon United | 1st | |||
| 2nd | ||||
| Yasothon | 1st | |||
| 2nd |
As of 3 January 2021.
| Rank | Player | Club | Goals | |
|---|---|---|---|---|
| 1 |  Jardel Capistrano | Udon United | 22 | |
| 2 |  Diarra Junior Aboubacar | Muang Loei United | 11 | |
| Vinicius Silva Freitas | Nakhon Ratchasima United | |||
 Chawin Thirawatsri | Udon United | |||
| 5 | Apiwat Chuenban | Surin Khong Chee Mool | 9 | |
| 6 | Phakhawat Poonachaing | Yasothon | 8 | |
| 7 | Jakkrawut Songma | Udon United | 7 | |
| 8 | Nattawut Wuttiya | Surin Khong Chee Mool | 6 | |
| Saran Srideth | Ubon Kruanapat | |||
| 10 | Phanu Wanchuphloed | Khon Kaen Mordindang | 5 |
| Player | For | Against | Result | Date | |
|---|---|---|---|---|---|
| Jardel Capistrano5 | 8–0 (H) | ||||
| Diarra Junior Aboubacar | 7–1 (H) | ||||
| 3–1 (H) | |||||
| Célio Guilherme da Silva Santos | 4–0 (H) | ||||
| Chawin Thirawatsri4 | 9–2 (A) | ||||
| Phanu Wanchuphloed | 5–0 (H) | ||||
| 3–2 (A) |
As of 3 January 2021.
| Rank | Player | Club | Clean sheets |
|---|---|---|---|
| 1 | Banharn Karin | Muang Loei United | 8 |
| 2 | Panuwat Sritongdee | Udon United | 5 |
| 3 | Ratchaphon Thiamsorn | Chaiyaphum United | 3 |
| Naphat Kongjandee | Sakon Nakhon | ||
| Suttipong Seankla | Ubon Kruanapat | ||
| Jetsada Bunrueng | Yasothon |