(sometimes "Diego Morcillo Rubio de Suñón de Robledo") (January 3, 1642, Villarrobledo, Albacete, Spain – 1730, Lima, Peru) was a Spanish bishop in Peru and twice viceroy of the colony, from August 15, 1716 to October 5, 1716 (interim) and from January 26, 1720 to May 14, 1724.