Jon or John Sheffield may refer to:
English peers and politicians John Sheffield, 2nd Baron Sheffield (c. 1538–1568) John Sheffield (MP) (died 1614), MP for Lincolnshire (UK Parliament constituency)#MPs 1290-1640, 1601–1614 John Sheffield, 1st Duke of Buckingham and Normanby (1648–1721), poet and politician
Sportspeople John Sheffield (British Army officer) (1910–1987), British Army officer and Olympic hurdler Jon Sheffield (born 1969), English football goalkeeper
Others John Sheffield (physicist) (1936–2026), British physicist Johnny Sheffield (1931–2010), American child actor