William Hendrick "Bill" Foster (June 12, 1904 – September 16, 1978) was an American left-handed pitcher in baseball's Negro Leagues in the 1920s and 1930s, and the half-brother of Negro league pioneer Rube Foster.

Foster was born in Calvert, Texas in 1904.

From 1960 to 1977 he was a dean and baseball coach at his alma mater, Alcorn Agricultural and Mechanical College.