The 2018 Thai FA Cup is the 25th season of a Thailand's knockout football competition. It 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. 92 clubs were accepted into the tournament, and it began with the qualification round on 4 April 2018, and concluded with the final on 27 October 2018. The winner would have qualified for the 2019 AFC Champions League preliminary round 2 and the 2019 Thailand Champions Cup.