John Montagu may refer to:
- John Montagu, 1st Baron Montagu (âÂÂ), English nobleman
- John Montagu, 3rd Earl of Salisbury (âÂÂ1400), English nobleman
- John Montagu (Trinity) (âÂÂ1728), Master of Trinity College, Cambridge, 1683âÂÂ1699
- John Montagu, 2nd Duke of Montagu (1690âÂÂ1749), British peer
- John Montagu, 4th Earl of Sandwich (1718âÂÂ1792), British statesman, claimed to be the eponymous inventor of the sandwich
- John Montagu (Royal Navy officer) (1719âÂÂ1795), Commodore Governor for Newfoundland and Labrador, 1776âÂÂ1778
- John Montagu, Marquess of Monthermer (1735âÂÂ1770), British peer
- John Montagu, 5th Earl of Sandwich (1744âÂÂ1814), British peer and Tory politician
- John Montagu (colonial secretary) (1797âÂÂ1853), British army officer and Colonial Secretary of Van Diemen's Land and the Cape Colony
- John Montagu, 7th Earl of Sandwich (1811âÂÂ1884), British peer and Conservative politician
- John Montagu, 11th Earl of Sandwich (1943âÂÂ2025), British businessman and politician
See also