John Curtin (1885–1945) was an Australian prime minister.
John Curtin may also refer to:
- John I. Curtin (1837–1911), American Civil War general
- John Curtin (American politician) (1865–1925), California state senator
- John Thomas Curtin (1921–2017), U.S. federal judge
- John Curtin (footballer) (1924–2019), Australian rules footballer for St Kilda