John Davidson may refer to:
John Davidson (antiquarian) (c.1725–1797), Scottish lawyer, publisher and antiquarian
John Andrew Davidson (1852–1903), Canadian politician
John Davidson (actor) (1886–1968), American actor
John Davidson (botanist) (1878–1970), British Columbia's first Provincial Botanist
John Davidson (cricketer) (1804–1898), English cricketer
John Davidson (entertainer) (born 1941), American television actor and game show host
John Davidson (general) (1824–1881), US Army major general
John Davidson (ice hockey) (born 1953), Canadian NHL hockey player and executive
John Davidson (minister) (1834–1881), Presbyterian minister and academic
John Davidson (poet) (1857–1909), Scottish poet and playwright
John Davidson (politician) (1924–2012), American politician
John Davidson (traveller) (1797–1836), English traveler in Africa
John Frank Davidson (born 1926), chemical engineer awarded a Royal Medal in 1999
John Humphrey Davidson (1876–1954), British major general and politician
John James Davidson, British MP, 1935–1945
J. C. C. Davidson, 1st Viscount Davidson (1889–1970), British politician
John Ogilvie Davidson (1892–1972), Canadian surveyor
John Davidson, sufferer of Tourette's Syndrome and the subject of a BBC documentary John's Not Mad