Francisco Castillo Fajardo, 2nd Marquis of Villadarias (es: Francisco Castillo Fajardo, segundo marqués de Villadarias) (Málaga, December 17, 1642 – 1716), was a Spanish general.
1693: defended Charleroi unsuccessfully against the French.
1698: defended Oran successfully against the Ottomans.
1702 : captain-general of Andalucia.
1702: defended Cadiz successfully against a British-Dutch fleet under the command of George Rooke in what was called the Battle of Cádiz (1702) .
1704, June-July : invaded Portugal and conquered Castelo de Vide and Marvão.
1704-1705 : tried to recapture Gibraltar from the British, until he was replaced on February 8, 1705 by the French Marshal de Tessé, who gave up the siege and retired.
1710 : commander of the Bourbon army in Cataluña, where he lost the Battle of Almenar. After this battle he was replaced by the Marquis de Bay.
1713 : captain-general of Valencia.