| Thai FA Cup | |
| Year: | 2021–22 |
| Other Titles: | Chang FA Cup |
| Country: | Thailand |
| Num Teams: | 94 |
| Defending Champions: | Chiangrai United |
| Matches: | 93 |
| Goals: | 376 |
| Top Goal Scorer: | Apiwat Pengprakon, Danilo Alves (6 goals) |
| Player: | Supachok Sarachat |
| Prevseason: | 2020–21 |
| Nextseason: | 2022–23 |
The 2021–22 Thai FA Cup is the 28th season of a Thailand's knockout football competition. The tournament was sponsored by Chang, and known as the Chang FA Cup (th|ช้าง เอฟเอคัพ) for sponsorship purposes. The tournament is organized by the Football Association of Thailand. 94 clubs were accepted into the tournament, and it began with the qualification round on 29 September 2021 and concluded with the final on 22 May 2022. The winner would have qualified for the 2023 AFC Champions League play-off and the 2022 Thailand Champions Cup.
| Round | Date | Matches | width=100 | Clubs ! | New entries this round |
|---|---|---|---|---|---|
| Qualification round | 29 September 2021 and 6 October 2021 | 30 | 13 + 28 + 19 → 30 | 13 2021–22 Thai League 2 28 2021–22 Thai League 3 19 Thailand Amateur League | |
| First round | 27 October 2021 | 32 | 30 + 16 + 3 + 7 + 8 → 32 | 16 2021–22 Thai League 1 3 2021–22 Thai League 2 7 2021–22 Thai League 3 8 Thailand Amateur League | |
| Second round | 24 November 2021 | 16 | 32 → 16 | ||
| Third round | 19 January 2022 and 2 February 2022 | 8 | 16 → 8 | ||
| Quarter-finals | 16 February 2022 | 4 | 8 → 4 | ||
| Semi-finals | 18 May 2022 | 2 | 4 → 2 | ||
| Final | 22 May 2022 | 1 | |||
| Total | 94 clubs | ||||
Note: T1: Clubs from Thai League 1; T2: Clubs from Thai League 2; T3: Clubs from Thai League 3; TA: Clubs from Thailand Amateur League.
There were 13 clubs from 2021–22 Thai League 2, 28 clubs from 2021–22 Thai League 3, and 19 clubs from Thailand Amateur League have signed to qualifying in 2021–22 Thai FA cup. This round had drawn on 10 September 2021.[1] There are 113 goals that occurred in this round.
The first round would be featured 30 clubs that were the winners of the qualification round including 10 clubs from T2, 15 clubs from T3, and 5 clubs from TA[2] and the new entries including 16 clubs from 2021–22 Thai League 1, 3 clubs from 2021–22 Thai League 2, 7 clubs from 2021–22 Thai League 3, and 8 clubs from Thailand Amateur League. This round had drawn on 1 October 2021.[3] There are 155 goals that occurred in this round.
The second round would be featured 32 clubs that were the winners of the first round including 15 clubs from T1, 3 clubs from T2, 13 clubs from T3, and 1 club from TA.[4] This round had drawn on 1 November 2021.[5] There are 69 goals that occurred in this round.
The third round would be featured 16 clubs that were the winners of the second round including 12 clubs from T1, 2 clubs from T2, and 2 clubs from T3.[6] This round had drawn on 14 December 2021.[7] There are 22 goals that occurred in this round.
The quarter-finals would be featured 8 clubs that were the winners of the third round including 6 clubs from T1 and 2 clubs from T3.[8] This round had drawn on 25 January 2022.[9] There are 8 goals that occurred in this round.
The semi-finals would be featured 4 clubs that were the winners of the quarter-finals, all are clubs from T1.[10] This round had drawn on 21 April 2022.[11] There are 8 goals that occurred in this round.
See main article: article and 2022 Thai FA Cup Final. The final would be featured 2 clubs that were the winners of the semi-finals, both are clubs from T1.[12] There is 1 goal that occurred in this round.
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Apiwat Pengprakon | Nongbua Pitchaya | 6 |
 Danilo Alves | Suphanburi | ||
| 3 | Nantawat Suankaew | Port | 5 |
| 4 |  Jonathan Bolingi | Buriram United | 4 |
| Maicon | |||
| Akarawin Sawasdee | Chiangrai United | ||
| Deyvison Fernandes de Oliveira | Lampang | ||
 Kwame Karikari | Nakhon Ratchasima Mazda | ||
| Nurul Sriyankem | Port | ||
 Sergio Suárez | |||
| Tanasith Siripala | |||
| Ricardo Santos | Uthai Thani |
| Player | For ! | Against | Result | Date | Round | |
|---|---|---|---|---|---|---|
| Caíque Freitas Ribeiro | Bangkok (T3) | Surin City (T3) | 5–0 (H) | Qualification round | ||
| Sukhothai (T2) | Banbueng (T3) | 4–0 (A) | Qualification round | |||
| Nantawat Suankaew5 | Port (T1) | MBF Amphawa (TA) | 22–1 (A) | First round | ||
| Nurul Sriyankem4 | Port (T1) | MBF Amphawa (TA) | 22–1 (A) | First round | ||
| Tanasith Siripala4 | Port (T1) | MBF Amphawa (TA) | 22–1 (A) | First round | ||
| Nongbua Pitchaya (T1) | Chattrakan City (TA) | 6–0 (A) | First round | |||
| Chiangrai United (T1) | Nan City (TA) | 12–0 (H) | First round | |||
| Ratchaburi Mitr Phol (T1) | Customs Ladkrabang United (T2) | 8–1 (H) | First round | |||
| Deyvison Fernandes de Oliveira | Lampang (T2) | Nonthaburi United S.Boonmeerit (T3) | 9–6 (H) | Second round | ||
| Jakkrawut Songma | Lampang (T2) | Nonthaburi United S.Boonmeerit (T3) | 9–6 (H) | Second round | ||
| Nongbua Pitchaya (T1) | Kasem Bundit University (T3) | 4–1 (H) | Second round |