The 2021 Thailand Champions Cup was the 5th Thailand Champions Cup, an annual football match contested by the winners of the previous season's Thai League 1 and Thai FA Cup competitions. It was sponsored by Daikin, and known as the Daikin Thailand Champions Cup (Thai: ไดกิ้น ไทยแลนด์แชมเปียนส์คัพ) for sponsorship purposes. The match was played on 1 September 2021 at the 700th Anniversary of Chiangmai Stadium in Mae Rim, Chiangmai and contested by 2020–21 Thai League 1 champions BG Pathum United, and Chiangrai United as the champions of the 2020–21 Thai FA Cup. It has live broadcast on Channel 5 HD and AIS Play.

Assistant referees:
Rachen Srichai
Worapong Prasertsri
Fourth official:
Natee Chusuwan
Assistant VAR:
Torpong Somsing
Rachan Dawangpa
Match Commissioner:
Khajorn Treesophanakorn
Referee Assessor:
Preecha Kangram
General Coordinator:
Narubet Kietprasert