John Mordaunt may refer to:
- John Mordaunt (speaker) (d. 1504), Tudor politician and Speaker of the House of Commons
- John Mordaunt, 1st Baron Mordaunt (d. 1562)
- John Mordaunt, 2nd Baron Mordaunt (1508âÂÂ1571)
- John Mordaunt, 1st Earl of Peterborough (1600âÂÂ1643)
- John Mordaunt, 1st Viscount Mordaunt (1626âÂÂ1675), Royalist conspirator
- Sir John Mordaunt, 5th Baronet (bef. 1649âÂÂ1721)
- John Mordaunt, Viscount Mordaunt (c. 1681âÂÂ1710)
- John Mordaunt (British Army officer) (1697âÂÂ1780), English general and Member of Parliament
- John Mordaunt (MP) (c. 1709âÂÂ1767), British soldier and Member of Parliament
- Sir John Mordaunt, 7th Baronet (1734âÂÂ1806)
- Sir John Mordaunt, 9th Baronet (1808âÂÂ1845)
- Colonel John Mordaunt, in Lucknow and the subject of Colonel Mordaunt's Cock Match