Bunyawi Thamchaiwat (Thai: บุณยวีร์ ธรรมไชยวัฒน์; born 29 July 1998) is a Thai professional tennis player. She has won four singles titles on the ITF Women's Circuit. On 24 September 2018, she reached her best singles ranking of world No. 410, and at 17 September 2018 No. 631 in the doubles rankings. Playing for Thailand at the Fed Cup, Thamchaiwat has a win–loss record of 3–0.