William Collier, Jr. (February 12, 1902–February 5, 1987) was an American film and stage actor who appeared in 89 films.
Collier was born as Charles F. Gal, Jr. in New York City. When his parents divorced, his mother married actor, William Collier, Sr., who adopted Charles and gave the boy the new name William Collier Jr. (he was nicknamed "Buster").
Collier's stage experience helped him to get his first movie role in 1916, The Bugle Call, at the age of 14. Collier became a popular leading man. Collier's career spanned past his childhood and the advent of the sound film. In 1935, Collier retired. He died in San Francisco, California. Collier received a star on the Hollywood Walk of Fame.