Marquess of Castel-Moncayo (Spanish: Marqués de Castel-Moncayo) is a hereditary title in the Peerage of Spain, accompanied by the dignity of Grandee.

It was granted in 1682 by Charles II to Baltasar de Fuenmayor, ambassador in Denmark–Norway, the Spanish Netherlands and the Republic of Venice.

[2] The 12th Marquess, Carlos Falcó, died in Madrid on 20 March 2020 at the age of 83, as a result of COVID-19.

[3][4][5] He was succeeded by his eldest child, Manuel Falcó, who currently holds the title as 13th Marquess.

[6] The heir apparent is the present holder's eldest son, Carlos Falcó y Corsini, who was born in 1999 and educated at Harrow School and at the University of Southern California.