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 (Thai: 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.