William, Will, Bill or Billy Young may refer to:

• William Young (composer) (died 1662), English composer and viola da gambist
• William Young (architect) (1843–1900), Scottish architect, designer of Glasgow City Chambers
• William Young (playwright) (1847–1920), American playwright, writer and actor
• William Young (artist) (1875–1944), Australian watercolor painter
• Billy Young (singer) (born 1941), American singer/songwriter
• William Allen Young (born 1954), African American actor
• William P. Young (born 1955), Canadian/American novelist
• Will Young (born 1979), English actor and singer/songwriter
• Bill Young (died 2014), American comedian

• W. J. Young (William John Young, 1827–1896), American industrialist, founder of the W.J. Young Company
• William John Young (pastoralist) (1850–1931), Australian company chief executive and station manager
• Tom Young (trade unionist) (William Thomas Young, 1870–1953), New Zealand seaman and trade unionist
• William T. Young (1918–2004), American businessman
• William H. Young (labor leader) (born 1946), American labor leader, president of National Association of Letter Carriers

• William Young (Royal Navy officer, born 1751) (1751–1821), British Royal Navy officer
• William Young (Royal Navy officer, born 1761) (1761–1847), British Royal Navy officer
• William Young (Medal of Honor) (1835–1878), American Civil War sailor and Medal of Honor recipient
• William Hugh Young (1838–1901), Confederate States Army brigadier general
• William Young (VC) (1876–1916), Scottish recipient of the Victoria Cross
• William Ramsay Young (1894–1965), Australian soldier
• William Young (veteran) (1900–2007), British military veteran, last surviving member of Royal Flying Corps

• William Young (Australian politician) (1852–1915), New South Wales politician
• William Young (Tasmanian politician) (1912–2012), Australian politician
• Bill Young (Tasmanian politician) (1917–2003), Australian politician, member of the Tasmanian House of Assembly
• Bill Young (Western Australian politician) (1918–2012), Western Australian politician

• Bill Young (New Zealand politician) (1913–2009), New Zealand politician
• William Young (New Zealand politician) (fl. 1950), New Zealand politician, member of the Legislative Council
• William Young (judge) (born 1952), Justice of the Supreme Court of New Zealand

• Sir William Young, 1st Baronet, of North Dean (1724–1788), British politician, colonial Governor of Dominica
• Sir William Young, 2nd Baronet (1749–1815), British politician, colonial Governor of Tobago
• Sir William Young, 4th Baronet (1806–1842), British politician
• William Tanner Young (fl. 1838–1845), British diplomat
• Sir William Young, 1st Baronet, of Bailieborough Castle (died 1848), British baronet of County Cavan, Ireland
• William Robert Young (died 1933), Irish linen merchant, politician and philanthropist
• William Young (Scottish politician) (1863–1942), Scottish Member of Parliament for East Perthshire and Perth

• William Singleton Young (1790–1827), US Representative from Kentucky
• William Young (Wisconsin politician) (1821–1890), American politician
• William Henry Young (politician) (1845–?), American politician in Wisconsin
• William Albin Young (1860–1928), US Representative from Virginia
• Bill Young (Florida politician) (1930–2013), United States Representative from Florida
• William G. Young (born 1940), United States District Judge for the District of Massachusetts
• Bill Young (Nevada politician) (born 1956), American politician and sheriff of Clark County, Nevada

• William Young (Nova Scotia politician) (1799–1887), Canadian politician, Premier of Nova Scotia
• William Mackworth Young (1840–1924), member of the Indian Civil Service and Lieutenant-Governor of the Punjab
• William Douglas Young (1859–1943), Governor of the Falkland Islands
• William Alfred Young (1863–1911), President of the Council, and Magistrate of the British Overseas Territory of Pitcairn Island

• William Henry Young (1863–1942), English mathematician
• William John Young (biochemist) (1878–1942), English biochemist
• William Alexander Young (1889–1928), Scottish doctor and surgeon
• William Gould Young (1902–1980), American physical organic chemist, winner of the Priestley Medal
• William D. Young (doctor), Canadian doctor whose work was commemorated with the Dr. William D. Young Memorial fountain in Toronto
• William R. Young (oceanographer) (born 1955), Australian-American oceanographer

• Billy Young (American football) (1901–1971), American football player for the Green Bay Packers
• Bill Young (American football lineman) (1914–1994), American NFL football player for the Washington Redskins
• Bill Young (American football coach) (1946–2021), American college football defensive coordinator

• William Young (footballer, born 1884) (1884–1917), English footballer
• William Young (footballer, born 1892) (1892–1965), English footballer
• Billy Young (association football) (born 1938), Irish soccer player
• Bill Young (soccer) (born 1950), Canadian international soccer player

• William Young (English cricketer) (1861–1933), English cricketer
• William Young (Scottish cricketer) (1896–1966), Scottish cricketer
• Billy Young (cricketer) (born 1970), English cricketer
• Will Young (cricketer) (born 1992), New Zealand cricketer

• Bill Young (footballer, born 1886) (1886–1959), Australian rules footballer for St Kilda
• Bill Young (footballer, born 1931) (1931–2020), Australian rules footballer
• Will Young (Australian footballer) (born 1990), Australian rules footballer

• William J. Young (coach) (1881–1957), American college basketball and football coach
• William Pennington Young (1896–1968), American Negro league baseball player
• Bill Young (cycling) (1905–1994), Australian cycling administrator
• W. B. Young (1916–2013), Scottish rugby union player
• Bill Young (ice hockey) (born 1947), Canadian ice hockey player
• Bill Young (rugby union) (born 1974), Australian rugby union footballer

• William Weston Young (1776–1847), British Quaker entrepreneur, artist, and inventor
• William C. Young, (1842–1896), American minister and educator, eighth president of Centre College
• William Hooper Young (1871–?), convicted American murderer
• William Gordon Young (1904–1974), Australian physical culturist and public servant
• Bill Young (CIA officer) (1934–2011), American CIA officer largely responsible for the Laotian Civil War
• Leslie Isben Rogge (a.k.a. Bill Young, born 1940), American bank robber
• William R. Young (born 1946), Canadian civil servant

• Willie Young (disambiguation)
• William Yonge (disambiguation)