Charles Williams (September 27, 1898 – January 3, 1958) was an American actor and writer. He appeared in over 260 film and television productions between 1922 and 1956. He also worked as a writer on 30 films between 1932 and 1954.

He started his film career in the early 1920s in Paramount's New York studios, where he made his film debut in The Old Homestead, but also worked behind the camera as a writer and assistant director. With the arrival of sound film, he went to Hollywood and became a supporting actor there. The actor with the short stature and high-pitched voice was often uncredited for his appearances, although he had larger roles in a number of B movies.

Williams was known as a "B-movie regular", who often portrayed quirky, somewhat nerdy, bespectacled clerks, photographers and especially reporters. He is perhaps-best remembered today for appearing in It's a Wonderful Life as Eustace, George Bailey's cousin and co-worker at the Building and Loan. Near the end of his life and career, Williams also played in a number of television series.