William Cullen (1710–1790) was a Scottish physician and chemist.
William Cullen may also refer to:
Law William James Cullen, Lord Cullen (1859–1941), Scottish judge, Senator of the College of Justice from 1909 William Cullen, Baron Cullen of Whitekirk (born 1935), senior member of the Scottish Judiciary William Portus Cullen (1855–1935), chief-justice in New South Wales, Australia
Sports William Cullen (cricketer) (1887–1945), Australian cricketer William John Cullen (1894–1960), Irish rugby international William Goodsir-Cullen (1907–1994), Indian field hockey player
Other Bill Cullen (1920–1990), American television and radio personality Bill Cullen (businessman) (born 1942), Irish businessman, philanthropist, and media personality William Cullen (Illinois politician) (1826–1914), U.S. representative from Illinois William Cullen (Resident) (1785–1862), British Army Officer
See also Will Cullen Hart (born 1971), musician William Cullen Bryant (1794–1878), American writer Lord Cullen (disambiguation)