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 (soldier), (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) (born 1934), UK consultant and author on leadership
- John Frederick Adair (1852–1913), Irish physicist
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