Robert Montagu may refer to:
Robert Montagu, 3rd Earl of Manchester (1634–1683), English politician and courtier Robert Montagu, 3rd Duke of Manchester (c. 1710–1762), MP Robert Montagu (politician) (died 1693) Robert Montagu (Royal Navy officer) (1763–1830), British admiral Lord Robert Montagu (1825–1902), British Conservative politician
See also Robert Montague (disambiguation)