Mary Montagu
Mary Montagu may refer to:
- Lady Mary Faith Montagu, daughter of the 9th Earl of Sandwich
- Lady Mary Wortley Montagu, English writer
- Mary Montagu Douglas Scott, Duchess of Buccleuch, British duchess
- Mary Montagu, Duchess of Montagu (1689–1751), formerly Lady Mary Churchill, wife of John Montagu, 2nd Duke of Montagu
- Mary Montagu, Duchess of Montagu (1711–1775), daughter of the above, wife of George Brudenelllater Montagu, 4th Earl of Cardigan, and later Duchess of Montagu
- Mary Stuart, Countess of Bute, wife of John Stuart, 3rd Earl Stuart