Witthaya Thongyooyong (nickname: Ball) is a director born in Saraburi, Thailand. He is graduated at Bachelor of Communication Arts specialed Film and Photography from Chulalongkorn University.

One of his works more know is "My Girl" (2003), film that was the most popular and the highest grossing movie of the year in Thailand. In fact, for that film he won The Best Director in "The Asian New Talent Award" (2004) and "The Thailand National Film Association Award" (2004) together with the others five directors.