William Egan may refer to:
William Egan (footballer) (1872–1946), Welsh international footballer William Egan (gangster) (1884–1921), St. Louis politician and organized crime figure William Egan (hurler) (born 1990), Irish hurler William A. Egan (1914–1984), American Democratic politician; Governor of Alaska, 1959–1966 and 1970–1974 William B. Giles Egan (1824–1878), Justice of the Louisiana Supreme Court William Bradshaw Egan (1808–1860), Irish American physician and politician William F. Egan (1936–2012), American electrical engineer William Henry Egan, member of parliament for Birkenhead West, 1923–1924 and 1929–1931 William P. Egan, American businessman and investor