Allan is a Scottish surname derived from the given name of the same spelling.
Notable people with the surname Allan include
- Charlie Allan (musician) (born 1963), Scottish actor and musician
- Davie Allan, American guitarist
- Deborah Allan "Debbie" (born 1975), British judoka
- Denis Allan (born 1944), Canadian chess master
- Elkan Allan born Elkan Philip Cohan (1922–2006), British TV and radio producer and print journalist
- Frank Allan (1849–1917), Victorian, Australian, cricketer
- Frank Kellogg Allan (1935–2019), bishop of Atlanta
- Freya Allan (born 2001), English actress
- Gary Allan (born 1967), American country music singer and songwriter
- George Allan (disambiguation) several people, including
- George Allan (antiquary) (1736–1800), English antiquary and attorney
- George Allan (barrister) (1767–1828), English politician, son of the antiquary
- George Allan (composer) (1864–1930), composer and arranger of music for brass bands
- George Allan (cricketer) (1887–1932), Australian cricketer
- George Allan (footballer, born 1875) (1875–1899), Scottish footballer (Liverpool FC, Celtic, national team)
- George Allan (footballer, born 1885) (1885–1916), Scottish footballer (Partick Thistle, Ayr United)
- George Allan (footballer, born unknown) (fl. 1890s), Scottish footballer
- George William Allan (1822–1901), Canadian politician
- George William Allan (Manitoba politician) (1860–1940), Canadian politician
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- James Allan (Australian footballer) (born 1985), Australian rules footballer
- James Allan (cricketer) (born 1972), New Zealand cricketer
- James Allan (footballer, born 1857) (1857–1911), Scottish schoolmaster and footballer, founder of Sunderland A.F.C.
- James Allan (footballer, born 1866) (1866–1945), Scottish international footballer (also known as John Allan)
- James Allan (rugby union) (1860–1934), New Zealand rugby union player
- James Alexander Allan (1879–1967), Australian poet
- James Allan (diplomat) (1932–2018), British diplomat
- James Allan (musician) (born 1979), lead singer and guitarist and former footballer
- James Allan (Canadian politician) (1894–1992), Ontario politician
- James Allan (bishop) (1928–2013), Canadian Anglican
- James Allan (computer scientist), University of Massachusetts Amherst professor
- James Allan (law professor) (born 1960), Canadian-Australian law professor
- James Allan (Queensland politician) (1856–1938), Queensland draper and state politician
- James Allan Jr. (1845–1932), Wisconsin politician
- James McGrigor Allan (1827–1916), British anthropologist and writer
- John Allan (Australian politician) (1866–1936), Premier of Victoria, 1924–1927
- John Allan (Australian footballer) (1882–1933), Australian rules footballer for Collingwood
- John Allan (antiquarian) (1777–1863), Scottish-born American antiquarian
- John Allan (businessman) (born 1948), former chairman of Tesco
- John Allan (Canadian naval officer) (1928–2014), Canadian admiral
- John Allan (Canadian politician) (1856–1922), Canadian politician, member for Hamilton West
- John Allan (colonel) (1746–1805), in the Massachusetts Militia, American Revolutionary War
- John Allan (fighter) (born 1993), Brazilian mixed martial artist
- John Allan (footballer, born 1872) (1872–?), footballer for Derby County, Notts County
- John Allan (footballer, born 1890) (1890–?), footballer for Everton, Leeds City, Coventry City
- John Allan (footballer, born 1931) (1931–2003), Scottish footballer for Dunfermline Athletic, Aberdeen
- John Allan (footballer, fl. 1932–33), Scottish footballer for Hamilton Academical
- John Allan (golfer) (1847–1897), Scottish golfer
- John Allan (minister) (1897–1979), New Zealand Presbyterian minister and professor of theology
- John Allan (numismatist) (1884–1955), British numismatist
- John Allan (rugby union) (born 1963), Scottish and South African rugby union player
- John Allan (Salvation Army officer) (1887–1949), 8th Chief of the Staff of the Salvation Army and U.S. Army colonel
- John Allan (Victorian MLC), colonial Victorian politician
- John Anthony Allan (1937–2021), British geographer
- John Beresford Allan (1841–1927), politician in Manitoba, Canada
- John R. Allan, Scottish journalist, broadcaster, author, and farmer
- Robert Allan, Baron Allan of Kilmahew (1914–1979), Conservative politician
- Robert Allan (businessman) (1847–1927), manufacturer in Christchurch, New Zealand
- Robert Allan (footballer), goalkeeper for Sunderland A.F.C. (1907–08)
- Robert Allan (mineralogist) (1806–1863), Fellow of the Royal Society of Edinburgh, Fellow of the Geological Society
- Robert Allan (poet) (1774–1841), Scottish poet
- Robert Allan (trade unionist), leader of the Scottish Trades Union Congress
- Robert Allan Ltd., Canadian naval architectural firm
- Robert George Allan (1879–1972), agricultural administrator in India
- Robert M. Allan (1880–?), member of the City Council in Los Angeles, 1921–1927
- George William Allan (1822–1901), Canadian politician
- George William Allan (Manitoba politician) (1860–1940), Canadian politician
- William Allan (banker) (c. 1770–1853), Canadian banker, businessman and politician
- William Allan (British Army officer) (1832–1918)
- William Allan (classicist) (born 1970), Scottish classicist
- William Allan (English politician) (1837–1903), Liberal Party politician in the United Kingdom
- William Allan (footballer, born 1880) (1880–1965), Scottish goalkeeper for Falkirk, Rangers and Hibernian
- William Allan (footballer, born 1904) (1904–1969), Scottish defender for Hamilton and Motherwell
- William Allan (geneticist) (1881–1943), American physician and geneticist
- William Allan (painter) (1782–1850), Scottish historical painter
- William Allan (Queensland politician) (1840–1901), Australian pastoralist and politician
- William Allan (trade unionist) (1813–1874), British trade unionist
- William Evan Allan (1899–2005), Australian military figure, seeing service in WWI and WWII
- William Allan of Glen (1788–1868), Lord Provost of Edinburgh
- Willie Allan (born 1942), Scottish forward for Aberdeen, St Mirren, Falkirk, Morton and Alloa