William Clemens was an American film director. Born in Saginaw, Michigan, Clemens began his Hollywood career as a film editor in 1931. His first directing project was Man Hunt in 1936. His major credits include On Dress Parade with the Dead End Kids, two Perry Mason mysteries, three films featuring detective Tom Lawrence, a.k.a. "The Falcon," four films based on the Nancy Drew series, and Calling Philo Vance in 1940. Clemens' final project was The Thirteenth Hour in 1947.