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 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.

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.

[12] This round was played on 11 April 2021 at Thammasat Stadium in Khlong Luang, Pathum Thani.