| Thai FA Cup | |
| Year: | 2020–21 |
| Other Titles: | Chang FA Cup |
| Country: | Thailand |
| Num Teams: | 91 |
| Defending Champions: | Port |
| Champions: | Chiangrai United |
| Count: | 3 |
| Runner-Up: | Chonburi |
| Matches: | 90 |
| Goals: | 368 |
| Top Goal Scorer: | Bill, Eliandro (8 goals) |
| Player: | Worachit Kanitsribampen |
| Prevseason: | 2019 |
| Nextseason: | 2021–22 |
The 2020–21 Thai FA Cup is the 27th season of a Thailand's knockout football competition, this season is the 50th anniversary since its establishment in 1970. The tournament was sponsored by Chang, and known as the Chang FA Cup (Thai: ช้าง เอฟเอคัพ) for sponsorship purposes. The tournament is organized by the Football Association of Thailand. 91 clubs were accepted into the tournament, and it began with the qualification round on 30 September 2020 and concluded with the final on 11 April 2021. The winner would have qualified for the 2022 AFC Champions League group stage and the 2021 Thailand Champions Cup.
| Round | Date | Matches | width=100 | Clubs ! | New entries this round |
|---|---|---|---|---|---|
| Qualification round | 30 September 2020 | 27 | 8 + 25 + 21 → 27 | 8 2020–21 Thai League 2 25 2020–21 Thai League 3 21 Thailand Amateur League | |
| First round | 7–8 November 2020 | 32 | 27 + 16 + 5 + 7 + 9 → 32 | 16 2020–21 Thai League 1 5 2020–21 Thai League 2 7 2020–21 Thai League 3 9 Thailand Amateur League | |
| Second round | 5–30 December 2020 | 16 | 32 → 16 | ||
| Third round | 3 February 2021 | 8 | 16 → 8 | ||
| Quarter-finals | 3 April 2021 | 4 | 8 → 4 | ||
| Semi-finals | 7 April 2021 | 2 | 4 → 2 | ||
| Final | 11 April 2021 | 1 | |||
| Total | 91 clubs | ||||
Note: T1: Clubs from Thai League 1; T2: Clubs from Thai League 2; T3: Clubs from Thai League 3; T4: Clubs from Thailand Amateur League.
There were 8 clubs from 2020–21 Thai League 2, 25 clubs from 2020–21 Thai League 3 and 21 clubs from Thailand Amateur League have signed to participate in the 2020–21 Thai FA Cup. The draw took place on 24 February 2020.[1]
The first round would be featured by 27 clubs which were the winners of the qualification round including 4 clubs from T2, 17 clubs from T3, and 6 clubs from T4[2] and the new entries including 16 clubs from 2020–21 Thai League 1, 5 clubs from 2020–21 Thai League 2, 7 clubs from 2020–21 Thai League 3, and 9 clubs from Thailand Amateur League. This round had drawn on 22 October 2020.[3]
The second round would be featured by 32 clubs which were the winners of the first round including 15 clubs from T1, 5 clubs from T2, 10 clubs from T3, and 2 clubs from T4.[4] This round had drawn on 12 November 2020.[5]
The third round would be featured by 16 clubs which were the winners of the second round including 10 clubs from T1, 2 clubs from T2, and 4 clubs from T3.[6] This round had drawn on 15 December 2020.[7]
The quarter-finals would be featured by 8 clubs which were the winners of the third round including 7 clubs from T1 and 1 club from T3.[8] This round had drawn on 1 March 2021.[9]
The semi-finals would be featured by 4 clubs which were the winners of the quarter-finals, all were clubs from T1.[10] This round had drawn on 5 April 2021.[11]
See main article: article and 2021 Thai FA Cup Final. The final round would be featured by 2 clubs which were the winners of the semi-finals round, both were clubs from T1.[12] This round was played on 11 April 2021 at Thammasat Stadium in Khlong Luang, Pathum Thani.[13]
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Bill | Chiangrai United | 8 |
| Eliandro | Suphanburi (4 goals), Chonburi (4 goals) | ||
| 3 |  Chananan Pombuppha | Bangkok United | 4 |
| Supachok Sarachat | Buriram United | ||
| Ailton | Muangkan United | ||
 Bireme Diouf | Muangkan United | ||
| Natthawut Sukaram | Nonthaburi United S.Boonmeerit | ||
| Phatsaphon Choedvichit | Wat Bot City |
| Player | For ! | Against | Result | Date | Round | |
|---|---|---|---|---|---|---|
| Nongbua Pitchaya (T2) | Nam Phong United (T4) | 6–0 (H) | Qualification round | |||
| Phatsaphon Choedvichit | Wat Bot City (T3) | Siam (T3) | 3–0 (H) | Qualification round | ||
| Natthawut Sukaram4 | Nonthaburi United S.Boonmeerit (T3) | Nakhon Ratchasima Prokick United (T4) | 8–1 (H) | Qualification round | ||
| Ailton4 | Muangkan United (T3) | Nam Phong City (T4) | 11–0 (H) | First round | ||
| PT Prachuap (T1) | Khon Kaen Mordindang (T3) | 7–0 (A) | First round | |||
| Buriram United (T1) | Samut Songkhram (T3) | 9–0 (H) | First round | |||
| Muhammadnasay Kolae | Sukhothai (T1) | Surindra YMA (T4) | 9–1 (H) | First round | ||
| Aboubacar Junior Diarra | Muang Loei United (T3) | Kranuan (T4) | 5–0 (A) | First round | ||
| Chonburi (T1) | Kalasin Sauropod (T4) | 7–0 (A) | First round | |||
| SCG Muangthong United (T1) | Phatthananikhom City (T4) | 10–0 (H) | First round | |||
| SCG Muangthong United (T1) | Phatthananikhom City (T4) | 10–0 (H) | First round | |||
| Trat (T1) | Pluakdaeng United (T3) | 5–2 (A) | Second round | |||
| Chiangrai United (T1) | Muang Loei United (T3) | 5–2 (A) | Third round | |||
| Chonburi (T1) | Trat (T1) | 5–1 (H) | Quarter-finals |