Pedro III Fajardo de Zúñiga y Requesens (1602 – Palermo, Sicily, 3 November 1647) was a Spanish soldier and aristocrat notable for his command of Spanish forces during the Catalan Revolt after 1640. He was Viceroy of Valencia, 1631–1635, Viceroy of Navarre, 1638–1640, Viceroy of Catalonia, 1640–1642, Spanish Ambassador to Rome, and Viceroy of Sicily, 1644-1647.