Sir Humphrey Gilbert (c. 1539 – 9 September 1583) of Devon in England was a half-brother of Sir Walter Raleigh (they had the same mother, Catherine Champernowne), and cousin of Sir Richard Grenville. Adventurer, explorer, member of parliament, and soldier, he served during the reign of Queen Elizabeth and was a pioneer of the English colonial empire in North America and the Plantations of Ireland.