| Competition: | Thai League 3 Eastern Region |
| Season: | 2020–21 |
| Dates: | 3 October 2020 – 3 January 2021 |
| Continentalcup1: | |
| Continentalcup1 Qualifiers: | Pluakdaeng United Chachoengsao Hi-Tek |
| Matches: | 98 |
| Total Goals: | 277 |
| Biggest Home Win: | 6 goals difference (26 December 2020) |
| Biggest Away Win: | 4 goals difference (4 November 2020) (19 December 2020) |
| Highest Scoring: | 9 goals (11 October 2020) |
| Longest Wins: | 7 matches Bankhai United Pluakdaeng United |
| Longest Unbeaten: | 8 matches Chachoengsao Hi-Tek |
| Longest Winless: | 8 matches ACDC Chanthaburi Royal Thai Fleet Sakaeo |
| Longest Losses: | 6 matches Royal Thai Fleet |
| Prevseason: | 2019 (T3), 2019 (T4) |
| Nextseason: | 2021–22 |
The 2020–21 Thai League 3 Eastern 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 12 teams located in Eastern of Thailand will compete in the league of the Eastern 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 | 5 | ACDC, Banbueng, Marines Eureka, Pattaya Discovery United, and Royal Thai Fleet | ||
| align=center rowspan="2" | 2 | 2 | Assawin Kohkwang United and Chanthaburi | |
| 2 | Bankhai United and Pluakdaeng United | |||
| align=center rowspan="3" | 3 | 1 | Chachoengsao Hi-Tek | |
| 1 | Saimit Kabin United | |||
| 1 | Sakaeo |
| Team | Location | Stadium | Coordinates | |
|---|---|---|---|---|
| Battleship Stadium | ||||
| Assawin Kohkwang United | Rambhai Barni Rajabhat University Stadium | |||
| Banbueng | Stadium of Thailand National Sports University, Chonburi Campus | |||
| Bankhai United | Wai Krong Stadium | |||
| Chachoengsao Hi-Tek | Chachoengsao Municipality Stadium | |||
| Chanthaburi | Chanthaburi Provincial Stadium | |||
| Marines Eureka | Sattahip Navy Stadium | |||
| Pattaya Discovery United | Nong Prue Stadium | |||
| Pluakdaeng United | CK Stadium | |||
| Royal Thai Fleet | Battleship Stadium | |||
| Saimit Kabin United | Nomklao Maharat Stadium | |||
| Sakaeo | Sakaeo 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 |
|---|---|---|---|---|
| 1st | ||||
| 2nd | ||||
| Assawin Kohkwang United | 1st | |||
| 2nd | ||||
| Banbueng | 1st | |||
| 2nd | ||||
| Bankhai United | 1st | |||
| 2nd | ||||
| Chachoengsao Hi-Tek | 1st | |||
| 2nd | ||||
| Chanthaburi | 1st | |||
| 2nd | ||||
| Marines Eureka | 1st | |||
| 2nd | ||||
| Pattaya Discovery United | 1st | |||
| 2nd | ||||
| Pluakdaeng United | 1st | |||
| 2nd | ||||
| Royal Thai Fleet | 1st | |||
| 2nd | ||||
| Saimit Kabin United | 1st | |||
| 2nd | ||||
| Sakaeo | 1st | |||
| 2nd |
As of 3 January 2021.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 | Burnel Okana-Stazi | Bankhai United | 17 |
| 2 |  Sarawut Choenchai | Chachoengsao Hi-Tek | 12 |
| 3 |  Lucas Massaro Garcia Gama | Chachoengsao Hi-Tek | 11 |
| Alberto Moreira Gouvea | Pluakdaeng United | ||
| 5 | Anurak Yeunhan | Pluakdaeng United | 10 |
| 6 | Warut Trongkratok | Pluakdaeng United | 7 |
| 7 | Nititorn Sripramarn | Banbueng | 6 |
| Soravit Saisom | Marines Eureka | ||
| Pipat Thonkanya | Pattaya Discovery United |
| Player | For | Against | Result | Date | |
|---|---|---|---|---|---|
| 4–2 (A) | |||||
| 3–0 (H) |
As of 3 January 2021.
| Rank | Player | Club | Clean sheets |
|---|---|---|---|
| 1 | Pitsanu Permsab | Chachoengsao Hi-Tek | 10 |
| 2 | Kittisak Foofung | Pluakdaeng United | 8 |
| Sarayut Poolsap | Saimit Kabin United | ||
| 4 | Chairat Ketsaratikun | Chanthaburi | 4 |
| Anurak Suwalak | Marines Eureka | ||
| 6 | Ratchanon Intharavisut | Assawin Kohkwang United | 3 |
| Worawut Sukhuna | Bankhai United | ||
| Mongkol Jitthai | Pattaya Discovery United | ||
| Pongsaton Kachapol | Royal Thai Fleet |