thumb|200px|Arms of Killigrew: Argent, an eagle displayed with two heads sable a bordure of the second [[bezantée. The bezantée bordure indicates a connection to the ancient Earls of Cornwall]]
Sir Robert Killigrew (1580–1633) was an English courtier and politician who sat in the House of Commons at various times between 1601 and 1629. He served as Ambassador to the United Provinces.
Life
Killgrew was born at Lothbury, London, the son of William Killigrew and his wife Margery (Mary) Saunders, daughter of Thomas Saunders of Uxbridge, Middlesex. In January 1591, he matriculated at Christ Church, Oxford at the age of 11. He travelled abroad in 1596 and may have become an official of the Privy Chamber in 1601. He was elected MP for St Mawes in 1601. was a mistress of Charles II and bore him a daughter
- Mary Killigrew (1623–1677), later wife of Sir John James, she has been confused in other biographies with Mary Sackville (1645–1679) (formerly Berkeley, née Bagot) — the widowed Countess of Falmouth — who was another mistress
Mary, his widow, married Sir Thomas Stafford after 1633. She was a correspondent of Constantijn Huygens.