Sir Richard Grenville (15 June 1542 – 10 September 1591), also spelt Greynvile, Greeneville, and Greenfield, was an English privateer and explorer. Grenville was lord of the manors of Stowe, Cornwall and Bideford, Devon. He subsequently participated in the plantations of Ireland, the English colonisation of the Americas and the repulse of the Spanish Armada.