John Plunket or Plunkett may refer to:
John Plunket (judge) (c. 1497–1582), Irish politician and judge, Lord Chief Justice of Ireland John Plunket (Jacobite) (1664–1738), Irish Jacobite John Plunket, 3rd Baron Plunket (1793–1871), Irish peer and Queen's Counsel John Plunkett (1802–1869), Attorney-General of New South Wales John Plunkett, 17th Baron of Dunsany (1853–1899), Anglo-Irish politician and peer John Plunkett, 3rd Baron of Dunsany (died 1500), Anglo-Irish nobleman