John Fortescue may refer to:

• Sir John Fortescue (c. 1394 - c. 1476), English lawyer
• Sir John Fortescue of Salden (1531 or 1533 – 1607) third Chancellor of the Exchequer of England, serving from 1589 until 1603.
• Sir John William Fortescue (1859 – 1938) was a British statesman and military historian

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