Marquess of Castel-Moncayo () is a hereditary title in the Peerage of Spain accompanied by the dignity of Grandee, granted in 1682 by Charles II to Baltasar de Fuenmayor, ambassador in Denmark–Norway, the Spanish Netherlands and the Republic of Venice.
The 12th Marquess, Carlos Falcó, died in Madrid 20 March 2020 at the age of 83, as a result of COVID-19.
Marquesses of Castel-Moncayo (1682)
Baltasar de Fuenmayor y Camporredondo, 1st Marquess of Castel-Moncayo
Manuela de Fuenmayor y Dávila, 2nd Marchioness of Castel-Moncayo
Gaspara de Saavedra y Fuenmayor, 3rd Marchioness of Castel-Moncayo
Diego María Sarmiento de Saavedra y Fuenmayor, 4th Marquess of Castel-Moncayo
María de la Esclavitud Sarmiento De Silva y Sotomayor, 5th Marchioness of Castel-Moncayo Carlos José Gutiérrez de los Ríos y Sarmiento de Sotomayor, 6th Marquess of Castel-Moncayo Francisca de Asís Gutiérrez de los Ríos y Solís, 7th Marchioness of Castel-Moncayo María del Pilar Osorio y Gutiérrez de los Ríos, 8th Marchioness of Castel-Moncayo Felipe Falcó y Osorio, 9th Marquess of Castel-Moncayo Paloma Falcó y Escandón, 10th Marchioness of Castel-Moncayo Manuel Falcó y Escandón, 11th Marquess of Castel-Moncayo Carlos Falcó y Fernández de Córdoba, 12th Marquess of Castel-Moncayo Manuel Falcó y Girod, 13th Marquess of Castel-Moncayo
The heir apparent is the present holder's eldest son Carlos, born in 1999 and educated at Harrow School and at the University of Southern California.