William Long may refer to:
Politicians William Long (MP for Barnstaple, 1388) William Long (died c.1426), MP and Mayor for Rye William Long (mayor) (1781–1851), mayor of Columbus, Ohio William Long (antiquary) (1817–1886), English antiquarian William Long (New South Wales politician) (1839–1915), race-horse owner and Colonial Treasurer of New South Wales William Long (Australian politician) (1885–1957), member of the Australian Parliament for Lang William Long (Northern Ireland politician) (1922–2008), Unionist politician in Northern Ireland William Houston Long (1843–1912), member of the Queensland Legislative Council Brock Long (born 1975), full name William Brockmann Long, Administrator of the U.S. Federal Emergency Management Agency Billy Long (born 1955), American politician
Others William J. Long (1867–1952), American nature writer William Ivey Long (born 1947), American costume designer William Long (rowing) (1935–2010), American Olympic athlete William Long (surgeon) (1747–1818), English surgeon Private William Long, murdered in the 2009 Little Rock recruiting office shooting William Long (priest) (died 1835), Canon of Windsor William Henry Long (1867–1947), American mycologist Will West Long (c. 1869–1947), Cherokee mask maker, a translator, and a Cherokee cultural historian
See also Bill Long (disambiguation)