John Davidson may refer to:

Arts and entertainment

• John Davidson (poet) (1857–1909), Scottish poet and playwright
• John Davidson (actor) (1886–1968), American actor
• John Davidson (entertainer) (born 1941), American television actor and game show host

Military

• John Davidson (Royal Navy officer) (c. 1818–1881), English naval surgeon
• John Wynn Davidson (1825–1881), U.S. Army major general
• John F. Davidson (1908–1989), U.S. Navy admiral

Politics and law

• John Davidson (Lower Canada politician) (died 1838), Canadian merchant, civil servant and politician
• John S. Davidson (1846–1894), American politician, member of the Georgia State Senate
• John Andrew Davidson (1852–1903), Canadian politician
• John Davidson (British Army officer) (1876–1954), British major general and politician
• J. C. C. Davidson (1889–1970), British politician
• John James Davidson (1898–1976), British MP, 1935–1945
• John Davidson (Illinois politician) (1924–2012), American politician
• John Andrew Davidson, 2nd Viscount Davidson (1928–2012), British politician

Religion

• John Davidson (reformer) (1549–1603) Scottish Presbyterian minister during the Scottish Reformation
• John Davidson (minister) (1834–1881), Scottish Presbyterian minister and academic
• John Davidson (British writer) (born 1944), English writer on mysticism and Christian origins
• John Davidson (priest), Canadian Anglican priest

Sports

• John Davidson (cricketer, born 1804) (1804–1898), English cricketer
• John Davidson (rugby union) (1851–1919), Scottish rugby union player
• Gordon Davidson (ice hockey) (John Gordon Davidson, 1918–2004), Canadian ice hockey player
• John Davidson (ice hockey) (born 1953), Canadian NHL hockey player and executive
• John Davidson (rugby league) (born 1961), Australian rugby player
• John Davidson (cricketer, born 1964), Welsh cricketer

Others

• John Davidson (antiquarian) (1725–1797), Scottish lawyer, publisher and antiquarian
• John Davidson (traveller) (1797–1836), English traveler in Africa
• John Ewen Davidson (1841–1923), English pioneer sugar planter and miller in Queensland
• John Davidson (botanist) (1878–1970), Scottish-Canadian botanist
• John Ogilvie Davidson (1892–1972), Canadian surveyor
• John Davidson (chemical engineer) (1926–2019), British chemical engineer awarded a Royal Medal in 1999
• John Davidson (Tourette syndrome campaigner) (born 1972/1973), Scottish subject of a BBC documentary John's Not Mad