| Competition: | Thai League 3 Western Region |
| Season: | 2020–21 |
| Dates: | 3 October 2020 – 3 January 2021 |
| Continentalcup1: | |
| Continentalcup1 Qualifiers: | Muangkan United Rajpracha |
| Matches: | 101 |
| Total Goals: | 270 |
| Biggest Home Win: | 10 goals difference (25 October 2020) |
| Biggest Away Win: | 6 goals difference (21 October 2020) (4 November 2020) |
| Highest Scoring: | 10 goals (25 October 2020) |
| Longest Wins: | 5 matches Muangkan United |
| Longest Unbeaten: | 10 matches Muangkan United Rajpracha |
| Longest Winless: | 11 matches Thawi Watthana Samut Sakhon United |
| Longest Losses: | 7 matches Thawi Watthana Samut Sakhon United |
| Prevseason: | 2019 (T3), 2019 (T4) |
| Nextseason: | 2021–22 |
The 2020–21 Thai League 3 Western 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 Western, central, and Bangkok Metropolitan Region of Thailand will compete in the league of the Western 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 | |
|---|---|---|---|---|
| align=center rowspan="4" | 1 | 2 | Assumption United and Thawi Watthana Samut Sakhon United | |
| 2 | Muangkan United and Singha Golden Bells Kanchanaburi | |||
| 2 | Kanjanapat and Rajpracha | |||
| 2 | Bang Pa-in Ayutthaya and Pathumthani University | |||
| align=center rowspan="4" | 2 | 1 | Angthong | |
| 1 | Hua Hin City | |||
| 1 | Samut Songkhram | |||
| 1 | Saraburi United |
| Team | Location | Stadium | Coordinates | |
|---|---|---|---|---|
| Angthong | Angthong PAO. Stadium | |||
| Assumption United | Wongprachanukul Stadium | |||
| Bang Pa-in Ayutthaya | Bang Pa-in School Stadium | |||
| Hua Hin City | Hua Hin Municipal Stadium | |||
| Kanjanapat | Stadium of Rajamangala University of Technology Thanyaburi | |||
| Muangkan United | Kanchanaburi Provincial Stadium | |||
| Pathumthani University | Ratchakram Stadium | |||
| Rajpracha | Leo Stadium | |||
| Samut Songkhram | Samut Songkhram PAO. Stadium | |||
| Saraburi United | Stadium of National Sports Training Center, Muaklek | |||
| Singha Golden Bells Kanchanaburi | Kanchanaburi Municipality Stadium | |||
| Bangkokthonburi University 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 |
|---|---|---|---|---|
| Angthong | 1st | |||
| 2nd | ||||
| Assumption United | 1st | |||
| 2nd | ||||
| Bang Pa-in Ayutthaya | 1st | |||
| 2nd | ||||
| Hua Hin City | 1st | |||
| 2nd | ||||
| Kanjanapat | 1st | |||
| 2nd | ||||
| Muangkan United | 1st | |||
| 2nd | ||||
| Pathumthani University | 1st | |||
| 2nd | ||||
| Rajpracha | 1st | |||
| 2nd | ||||
| Samut Songkhram | 1st | |||
| 2nd | ||||
| Saraburi United | 1st | |||
| 2nd | ||||
| Singha Golden Bells Kanchanaburi | 1st | |||
| 2nd | ||||
| 1st | ||||
| 2nd |
As of 3 January 2021.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Bireme Diouf | Muangkan United | 17 |
| 2 |  Ronnachai Rangsiyo | Rajpracha | 12 |
| 3 | Sirichai Lamphuttha | Angthong | 10 |
 Caíque Freitas Ribeiro | Saraburi United | ||
| 5 | Moacir da Rosa Wilmsen | Angthong | 8 |
| Thawatchai Wisetdee | Thawi Watthana Samut Sakhon United | ||
| 7 | Kueanun Junumpai | Bang Pa-in Ayutthaya | 6 |
| Suchao Nuchnum | Muangkan United | ||
| Anggello Machuca | Rajpracha |
| Player | For | Against | Result | Date | |
|---|---|---|---|---|---|
| Arnon Prasongporn | 4–2 (A) | ||||
| Moacir da Rosa Wilmsen | 6–0 (A) | ||||
| 10–0 (H) | |||||
| Sirichai Lamphuttha | 4–1 (A) | ||||
| Chokanan Saima-in | 6–0 (H) |
As of 3 January 2021.
| Rank | Player | Club | Clean sheets |
|---|---|---|---|
| 1 | Atthapon Rutham | Angthong | 12 |
| 2 | Kiadtiphon Udom | Rajpracha | 6 |
| 3 | Suntiparp Boonlkliang | Muangkan United | 5 |
| 4 | Khanaphod Kadee | Bang Pa-in Ayutthaya | 4 |
| Natchaphon Dechwan | Hua Hin City |