William C. Foster (December 28, 1880 – January 18, 1923) was a pioneer of cinematography.

Foster left Selig in May 1911 to join Carl Laemmle’s Independent Moving Pictures Company (IMP).

In 1915, he signed with the Equitable Motion Picture Corporation, working in New York and Florida.

Foster was lead cinematographer on the first five two-reelers Charlie Chaplin made for Mutual Film Corporation in 1916: The Floorwalker, The Fireman, One A.M., The Count, and The Vagabond.

He later shot a number of pictures for director Frank Lloyd, including A Tale of Two Cities (Fox, 1917) and The Silver Horde (Goldwyn, 1920), and also worked with director Lois Weber.