John Fortescue may refer to:
- John Fortescue (judge) (c. 1394–1476), English lawyer and judge
- John Fortescue (died 1479), MP for Tavistock (UK Parliament constituency), Totnes, Plympton Erle and Wiltshire
- John Fortescue of Salden (1531/1533–1607), third Chancellor of the Exchequer of England
- John Fortescue Aland, 1st Baron Fortescue of Credan (1670–1746), English jurist
- John Fortescue (MP) (1819-1859), British MP
- John Fortescue (military historian) (1859–1938), British statesman and military historian