Wanchai Chaiwut (born 6 March 1989) is a Thai para table tennis player.
Chaiwut represented Thailand at the 2022 Asian Para Games and won gold medals in the men's singles and doubles, and a silver medal in the mixed doubles event.
Chaiwut represented Thailand at the 2024 Summer Paralympics in the men's doubles MD8 event, along with Yuttajak Glinbancheun, and won a bronze medal.