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P. K. Mookiah Thevar (1923–1979) was an Indian politician.

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He was born to Kattamuthu Ocha Thevar and Sevenamal on 4 April 1923 in Pappapatti village, near Usilampatti, Madurai district, India. He participated in many activities as a student leader. Later, he formed the Kallar educational trust and took several steps designed for the upliftment of all backward classes community in southern Tamil Nadu.He worked for the upliftment of downtrodden people and the vulnerable groups

Later, he joined Forward Bloc, an Indian National Political Party, formed by Subhas Chandra Bose, under the guidance of Pasumpon Muthuramalinga Thevar.^{[citation needed]}

He was elected for the Periakulam Assembly constituency in 1952–57 as a Forward Bloc candidate. He also served as a Member of the Legislative Assembly in Usilampatti for four terms (1957–62, 1962–67, 1967–71, 1977–79).

In 1971 he matched the achievement of U. Muthuramalinga Thevar in winning both Assembly^[1] and Parliament^[2] elections simultaneously. His parliamentary constituency was that of Ramanathapuram district and his period of office as an MP ran from 1971 to 1977.

He was elected to the Tamil Nadu legislative assembly from Usilampatti constituency as an Independent candidate in 1957 election, and as a Forward Bloc candidate in 1962, 1967, 1971 and 1977 elections.^{[3][4][5][6][7]}