William Walling (June 2, 1872 – March 5, 1932) was an American actor of the silent era. He appeared in 60 films between 1921 and 1932. He is known for his role as the railroad president in the 1926 film The Great K & A Train Robbery, which starred Tom Mix. He died in California, aged 59. He was the father of actor and photographer Richard Walling. Before he acted in films, Walling traveled the United States performing with stock theater companies.