William C. Kavanaugh (May 26, 1914 in East Chicago, Indiana – March 8, 1991 in Sun City West, Arizona), was a member of the Wisconsin State Assembly. Kavanaugh was born on May 26, 1914. He would graduate from Oglethorpe University. During World War II, Kavanaugh served in the United States Army. He died on March 14, 1991.