Richard Wingfield, 1st Viscount Powerscourt, PC (c.1550 – 9 September 1634) was an English-born army officer and military administrator during the reigns of Elizabeth I and James I. He is notable for his defeat of Sir Cahir O'Doherty's forces at the 1608 Battle of Kilmacrennan during O'Doherty's Rebellion in Ireland.