Duke of Aliaga () is a hereditary title in the Peerage of Spain, accompanied by the dignity of Grandee and granted in 1487 by Ferdinand II to Juan Fernández de Híjar, Count of Aliaga, Duke of Híjar and later also Duke of Lécera.Real Asociación de Hidalgos de España, Elenco de Grandezas y Títulos Nobiliarios Españoles, Ediciones Hidalguía, Vol. 50 (Madrid, 2018), pp. 61-62Search of title "Aliaga, duque de"
