William T. Corbett (1902 – April 17, 1971) was an American attorney, who served as Secretary of Guam under Ford Quint Elvidge, and later became as the interim Governor of Guam from May 19, 1956, to October 2, 1956. Graduating from the University of Pittsburgh College of Arts and Sciences in 1924 and the University of Pittsburgh School of Law in 1927, Corbett opened a private workers' compensation law firm before joining the United States Department of the Interior. Corbett was the brother of Representative Robert J. Corbett. He died on April 17, 1971, at the Northern Virginia Doctors Hospital at the age of 69.