John Montagu
John Montagu may refer to:
- John Montagu, 1st Baron Montagu, English nobleman
- John Montagu, 3rd Earl of Salisbury, English nobleman
- John Montagu (Trinity), Master of Trinity College, Cambridge, 1683–1699
- John Montagu, 2nd Duke of Montagu, British peer
- John Montagu, 4th Earl of Sandwich, British statesman, claimed to be the eponymous inventor of the sandwich
- John Montagu (Royal Navy officer), Commodore Governor for Newfoundland and Labrador, 1776–1778
- John Montagu, Marquess of Monthermer, British peer
- John Montagu, 5th Earl of Sandwich, British peer and Tory politician
- John Montagu (colonial secretary), British army officer and Colonial Secretary of Van Diemen's Land and the Cape Colony
- John Montagu, 7th Earl of Sandwich, British peer and Conservative politician
- John Montagu, 11th Earl of Sandwich, British businessman and politician