The Miss Universe Thailand is a beauty pageant that has been held annually since 2000 to select Thailand's representative to the Miss Universe pageant. The competition is a continuation of the Miss Thailand pageant which had selected Thailand's representative to the Miss Universe pageant from 1954 up until 1999.

Miss Thailand, is a beauty pageant held in Thailand for Thai women, first held on December 10, 1934, in Phra Nakhon District of Bangkok, under the name of Miss Siam. Since 2023, the winner of the pageant represents Thailand at Miss Global.