The Kru Muaythai Association (K.M.A) is the head organization officially certifying and issuing Muaythai Khan grading for teachers and students. The KMA is the only registered Kru organization by Thailand’s Ministry of Culture, recognized Worldwide.

The Kru Muaythai Association is the parent association for the World Muay Boran Federation (WMBF) and the World Muaythai Organization (WMO).