Bunyawi Thamchaiwat (; born 29 July 1998) is a Thai tennis player.
She has won four singles and five doubles titles on the ITF Women's Circuit. On 24 September 2018, she reached her best singles ranking of world No. 410, and on 21 April 2025 No. 449 in the doubles rankings.
Playing for Thailand Fed Cup team, Thamchaiwat has a winâÂÂloss record of 3âÂÂ0.
Thamchaiwat made her WTA Tour main-draw debut at the 2024 Thailand Open 2, in the doubles event, partnering Thasaporn Naklo. In the First round, Belgian Lara Salden and Kimberley Zimmermann were defeated in both sets.