“Baby Face” Leroy Foster (February 1, 1923 – May 26, 1958) was an American blues singer, drummer and guitarist, active in Chicago from the mid-1940s until the late 1950s. He was a significant figure in the development of the postwar electric Chicago blues sound, notably as a member of the Muddy Waters band during its formative years.

Foster was born in Algoma, Mississippi. He moved to Chicago in the mid-1940s and by 1946 was working with the pianist Sunnyland Slim and the harmonica player John Lee “Sonny Boy” Williamson. He was introduced to the singer and guitarist Muddy Waters by an acquaintance Waters met at a recording session in 1946. Foster was soon playing guitar and drums in Waters’s band, along with the guitar and harmonica player Jimmy Rogers. The band was later joined by Little Walter on harmonica. Calling themselves the Headhunters, the trio was known for going from club to club and “cutting” (i.e., engaging in musical duels with) other bands.