Music
- Frank Foster (jazz musician) (1928–2011), American jazz saxophonist
- Frank Foster (country singer) (born 1982), American country singer-songwriter who has been performing since 2011
Politics
- Frank Foster (Michigan politician) (born 1986), served in the Michigan House of Representatives from 2011 to 2014
- Frank Foster (Australian politician) (lived from 1872 to 1948)
- Francis Foster (Tasmanian politician) (lived from 1888 to 1979)
Sports
Francis Foster (1761–1847) was an English cricketer. Francis Foster (1848–1931) was also an English cricketer. Frank Foster (1889–1958) was an English cricketer. Frank Foster (1940–2019) was an English rugby player and coach.
Others
- Francis Foster, a British comedian known for his work in comedy
- Frank Hugh Foster (1851–1935), an American religious leader who served in the Congregational church
- Frank Keyes Foster (1854–1909), an American leader in labor organizations
- Frank William Foster (1887–1963), a British officer who served in the Royal Air Force
- Frank Foster, a character in the television show Coronation Street
- Frankie Foster, a character in the animated series Foster's Home for Imaginary Friends