Sir Richard Grenville (15 June 1542 – 10 September 1591), also spelt Greynvile, Greeneville, and Greenfield, was an English sailor who, as captain of , died at the Battle of Flores (1591), fighting against overwhelming odds, and refusing to surrender his ship to the far more numerous Spanish. His ship, "Revenge", met 53 Spanish warships near Flores in the Azores. He and his crew fought the fifty three in a three-day running battle. Many Spanish ships were sunk or so badly damaged that they had to retire from the battle. "Revenge" was boarded three times and each time the boarders were seen off.