Jack Barnett

Jack Barnett may refer to:


 * Jack Barnett (baseball) (1879–1923), American baseball player
 * Jack Barnett (footballer) (1899–1979), Australian rules footballer
 * Jack Barnett (politician) (1869–1945), full name John "Jack" Septimus Barnett, deputy mayor of Christchurch from 1938 to 1941
 * John Barnett (rugby) (1881–1918), known as Jack, Australian rugby union and rugby league player