William, Bill, Billy, Will, or Willie Nicholson may refer to:
Arts and entertainment William Nicholson (artist, born 1781) (1781–1844), English portrait-painter and etcher William Nicholson (poet) (1782–1849), Scottish poet, known as the Bard of Galloway William Adams Nicholson (1803–1853), English architect Sir William Nicholson (artist, born 1872) (1872–1949), English painter and engraver William Nicholson (sound engineer) (born 1937), American film sound engineer William Nicholson (writer) (born 1948), British screenwriter, playwright and novelist
Military William Nicholson (U.S. Navy officer) (c. 1790–1872), U.S. Navy officer William Nicholson, 1st Baron Nicholson (1845–1918), British field marshal and chief of the Imperial General Staff William Jones Nicholson (1856–1931), U.S. Army general Sir William Nicholson (Royal Navy officer) (1863–1932), British admiral William L. Nicholson (1926–2020), U.S. Air Force general
Politics William Nicholson (Australian politician) (1816–1865), mayor of Melbourne and premier of Victoria William Newzam Nicholson (1816–1899), British MP for Newark William Nicholson (distiller) (1824–1909), British distiller and politician William Graham Nicholson (1862–1942), British Liberal Unionist and later Conservative Party politician Will Nicholson (1900–1975), American politician in Colorado Billy Nicholson (politician) (born 1948), American politician and former insurance agent from Mississippi
Religion William Nicholson (English bishop) (1591–1672), bishop of Gloucester William Nicholson (American bishop) (1822–1901), American bishop of the Reformed Episcopal Church William Nicholson (Quaker) (1826–1899), American Quaker minister and physician
Sports Billy Nicholson (ice hockey) (1878–1947), Canadian ice hockey player and executive Willie Nicholson (fl. 1924–1936), Scottish footballer Bill Nicholson (cricketer) (1909–2001), Scottish cricketer Bill Nicholson (baseball) (1914–1996), American baseball player Bill Nicholson (footballer) (1919–2004), English football player, coach and manager
Others William Nicholson (chemist) (1753–1815), English chemist, publisher, and inventor William H. Nicholson (1869–1911), first African American fireman in the New York City Fire Department William Nicholson (journalist) (1877–1957), New Zealand clerk, local politician, builder, journalist and editor Bill Nicholson (Canadian administrator), Canadian farmer and administrator
See also William Nicolson (1655–1727), English divine and antiquary