O. A. K. Thevar (c. 1924 – c. 1973) was an Indian actor. He acted in over 200 films and stage plays. He is known for his antagonistic roles. In 1955 he acted his debut movie Maman Magal. His notable movies are Mahadhevi, Thaikkupin Tharam, Uthama Puthiran, Veerapandiya Kattabomman, and Karnan.