| Club: | Bangkok United F.C. |
| Season: | 2020–21 |
| Manager: |  Alexandré Pölking(until 18 October)  Danny Invincibile(interim, Until 5 November)  Totchtawan Sripan(from 5 November) |
| Chairman: | Kajorn Chearavanont |
| Stadium: | Thammasat Stadium, Khlong Luang, Pathum Thani, Thailand |
| League: | Thai League |
| League Result: | 5th |
| Cup1: | FA Cup |
| Cup1 Result: | Semi-finals |
| League Topscorer: | Nattawut Suksum (12) |
| Season Topscorer: | Nattawut Suksum (14) |
| Prevseason: | 2019 |
| Nextseason: | 2021–22 |
The 2020–21 season is Bangkok United Football Club's 12th in the new era since they took over from Bangkok University Football Club in 2009. It is the 5th season in the Thai League and the club's 10th (8th consecutive) season in the top flight of the Thai football league system since returning in the 2013 season.
In the league, match 5–30 are postponed following the coronavirus outbreak.[1]
| Position | Player | Transferred From | Ref |
|---|---|---|---|
| Buriram United | Season loan [2] [3] | ||
| Internacional | |||
| DF | Zachary Binrong | Brisbane Strikers | |
| Position | Player | Transferred To | Ref |
|---|---|---|---|
| Police Tero F.C. | [4] | ||
| Nakhon Pathom United F.C. | [5] | ||
| Ratchaburi Mitr Phol F.C. | |||
 FC Tokyo U-23 | [6] | ||
| Chonburi F.C. | [7] | ||
| Ventforet Kofu | [8] | ||
| Position | Player | Transferred From | Ref |
|---|---|---|---|
| Air Force Central F.C. | Loan Return | ||
| Ratchaburi Mitr Phol F.C. | Loan Return | ||
| Air Force Central F.C. | Loan Return | ||
| Thai Honda F.C. | Loan Return | ||
| Army United F.C. | Loan Return | ||
| Trat F.C. | Loan Return | ||
| Samut Prakan City F.C. | Loan Return | ||
| FC Tokyo U-23 | Loan Return [9] | ||
| Army United F.C. | Loan Return | ||
| Air Force Central F.C. | Loan Return | ||
| Air Force Central F.C. | Loan Return | ||
| Ratchaburi Mitr Phol F.C. | Loan Return | ||
| Air Force Central F.C. | Loan Return | ||
| Chonburi F.C. | Loan Return | ||
| Chonburi F.C. | Loan Return | ||
| Position | Player | Transferred To | Ref |
|---|---|---|---|
| Ratchaburi Mitr Phol F.C. | Free | ||
| Port F.C. | Season loan [11] | ||
Note 1: Bonilla will join Port on an initial loan deal, which will become a permanent transfer when his contract with Bangkok United is up in 31/12/2020.
2020 Asia Cup
See main article: 2020–21 Thai League 1.
See main article: 2020–21 Thai FA Cup.
|-! colspan="16" style="background:#DCDCDC; text-align:center;"| Goalkeepers|-! colspan="16" style="background:#DCDCDC; text-align:center;"| Defenders|-! colspan="16" style="background:#DCDCDC; text-align:center;"| Midfielders|-! colspan="16" style="background:#DCDCDC; text-align:center;"| Forwards|-! colspan="16" style="background:#dcdcdc; text-align:center"| Players transferred out during the season
| Rank | No. | Pos. | Player | Thai League | FA Cup | Total |
|---|---|---|---|---|---|---|
| 1 | 14 | FW | Nattawut Suksum | 12 | 2 | 14 |
| 2 | 37 | FW | Heberty | 9 | 1 | 10 |
| 3 | 10 | FW | Vander Luiz | 7 | 0 | 7 |
| 4 | 20 | FW | Chananan Pombuppha | 2 | 4 | 6 |
| 11 | MF | Anon Amornlerdsak | 4 | 2 | 6 | |
| 5 | 38 | FW | Brenner Marlos | 3 | 2 | 5 |
| 6 | 28 | MF | Thossawat Limwannasathian | 4 | 0 | 4 |
| 7 | 39 | MF | Pokklaw Anan | 3 | 0 | 3 |
| 3 | DF | Everton | 3 | 0 | 3 | |
| 4 | DF | Manuel Bihr | 3 | 0 | 3 | |
| 8 | 29 | MF | Sanrawat Dechmitr | 2 | 0 | 2 |
| 28 | MF | Rungrath Poomchantuek | 0 | 2 | 2 | |
| 5 | DF | Putthinan Wannasri | 2 | 0 | 2 | |
| 9 | 7 | MF | Hajime Hosogai | 1 | 0 | 1 |
| 21 | MF | Chayathorn Tapsuvanavon | 0 | 1 | 1 | |
| 19 | DF | Tristan Do | 1 | 0 | 1 | |
| 26 | DF | Peerapat Notchaiya | 0 | 1 | 1 | |
| 16 | DF | Mika Chunuonsee | 0 | 1 | 1 | |
| Own goals | 1 | 0 | 1 | |||
| Total | 57 | 17 | 74 | |||
