John Barnett (disambiguation)

John Barnett (1802–1890) was an English composer.

John Barnett may also refer to:


 * John Barnett (Australian rules footballer) (born 1975), former Australian rules footballer
 * John Barnett (rugby) (1880–1918), Australian rugby union and rugby league player
 * John Francis Barnett (1837–1916), English music composer and teacher
 * John Davis Barnett (1848–1926), early Canadian curator-librarian
 * Jack Barnett (baseball) (1879–1923), baseball player
 * John Maughan Barnett (1867–1938), New Zealand organist, choirmaster and conductor
 * John W. Barnett (1800–1876), Texas farmer, merchant and community leader
 * John Manley Barnett (1917–2013), American conductor
 * John Barnett (whistleblower) (1962–2024), Boeing whistleblower