Arts edit

• Will Foster (fl. 1990–), keyboardist for English rock band The Tears
• William C. Foster (1880–1923), pioneer of cinematography
• William D. Foster (1884–?), African American film producer
• William Gilbert Foster (1855–1906), British painter

Military edit

• William Foster (British Army officer) (1881–1942), British Home Guard officer, awarded the George Cross, 1942
• William Foster (Medal of Honor) (1832–1880), American soldier and Medal of Honor recipient
• William A. Foster (1917–1945), United States Marine, Medal of Honor recipient, killed in action during World War II
• William Foster MacNeece Foster, Royal Air Force officer

Politics edit

• William Foster (New South Wales politician, born 1865) (1865–1936), member of NSW Legislative Assembly (1925–1936)
• William Foster (New South Wales politician, born 1794) (1793/4–1866), member of the NSW Legislative Council (1843–1845)
• William John Foster (1831–1909), member of the NSW Legislative Council & Legislative Council, Attorney-General and Supreme Court judge
• William Foster (New Hampshire politician), New Hampshire politician
• William Foster (New York state senator) (1813–1893), New York politician
• William Foster (British politician) (1887–1947), British Labour Party MP for Wigan, 1942–1947
• William Henry Foster (Lancaster MP) (1848–1908), MP for Lancaster 1895–1900
• William Henry Foster (Bridgnorth MP) (1846–1924), British Member of Parliament (MP) for Bridgnorth 1870–1885
• William Orme Foster (1814–1899), British Whig MP for South Staffordshire, 1857–1868
• William W. Foster (1922–2000), Pennsylvania politician
• William Z. Foster (1881–1961), Chairman of the Communist Party USA

Religion edit

• William Foster (bishop) (1744–1797), Irish bishop
• William Foster (divine) (1591–16??), English divine

Sport edit

• William Foster (English cricketer) (1859–1944), English cricketer
• William Foster (Scottish cricketer) (born 1934), Scottish cricketer
• William Foster (swimmer) (1890–1963), British Olympic freestyle swimmer
• William Foster (footballer), English footballer

Other edit

• William Foster (historiographer) (1863–1951), British historiographer and Superintendent of Records at the India office
• William Foster (Iowa architect) (1842–1909), architect in Iowa, United States
• William Chapman Foster (1897–1984), American businessman and government official
• William Dewey Foster (1890–1958), American architect, designer of post offices and government buildings
• William H. Foster (1847–1886), British-born American labor union leader
• William P. Foster (1919–2010), creator of the Florida A&M University Marching 100 marching band
• William P. Foster (jurist), American jurist from Virginia
• William Trufant Foster (1879–1950), United States educator and economist, first president of Reed College
• William Wasbrough Foster (1875–1954), Canadian mountaineer, politician, business man, and chief constable
• William Foster (British architect) (1876–1940), British architect
• William Alexander Foster (1840–1888), Canadian barrister and essayist
• William Barclay Foster (1779–1855), father of Stephen Foster and businessman
• William E. Foster (1851–1930), American librarian and author
• William Foster, captain of the Clotilda and last person to have imported slaves from Africa to the United States

• William Foster & Co. Ltd, an agricultural machinery company, which built the first tanks (armored vehicles)
• William Foster Elementary School in Garfield Heights, Ohio named for William A. Foster, US. Marine

• William Foster, a character portrayed by Michael Douglas in the 1993 movie Falling Down
• William Foster, a character portrayed by Keanu Reeves in the 2018 movie Replicas

• Bill Foster (disambiguation)
• William Forster (disambiguation)