John Adair (1757–1840) was a U.S. soldier, statesman and governor of Kentucky.
John Adair may also refer to:
John Adair (surveyor) (1660–1718), Scottish surveyor and mapmaker John Adair (1732–1837), American pioneer and soldier, early settler of the Knoxville, Tennessee area John A. M. Adair (1864–1938), U.S. congressman from Indiana John Adair (anthropologist) (1913–1997), American anthropologist John George Adair (1823–1885), Scots-Irish businessman and landowner, financier of JA Ranch in the Texas Panhandle Johnny Adair (born 1963), Northern Irish paramilitary leader John Adair (author) (1934–2025), British consultant and author on leadership John Frederick Adair (1852–1913), Irish physicist John G. Adair, Canadian psychologist John Ronald Shafto Adair (1893–1960), Australian aviator, army officer and businessman