Juan Manuel Fernández Pacheco y Zúñiga, Duke of Escalona and Marquess of Villena (Marcilla, Navarre, 7 September 1650 – Madrid, 29 June 1725), was a Spanish aristocrat, politician, and academician who founded the Royal Spanish Academy.

Duke Juan Manuel Fernández, Duke of Escalona, Marquess of Villena, 12th Count of San Esteban de Gormaz, 8th Count of Xiquena was the son of Diego López Pacheco, 7th Duke of Escalona (1599–1653) and his second wife Juana María Francisca de Zuñiga (died 1652).

[1] He served as Mayordomo mayor to the king, viceroy, and captain-general of the Kingdoms of Navarre, Aragon, Catalonia, Sicily and Naples, and, on 9 October 1687, was awarded the title of Knight of the Order of the Golden Fleece.

In 1694 he lost the Battle of Torroella against the invading French and, during the War of the Spanish Succession, was imprisoned in Gaeta, Naples, by the Austrian empire, after losing the Siege of Gaeta (1707).

Upon his release and return to Spain, he founded—under orders of King Philip V—the Royal Spanish Academy (Real Academia Española (RAE)).