Fernando González de Marañón (died April 1219) was the sixth Grand Master of the Order of Santiago from 1206 until 1210.
He resettled the domains owned by his order, granting fueros to Huélamo and Villarrubia de Santiago and new rights to Ocaña.
Between 1207 and 1210, he received five bulls from Innocent III dealing with the rights of the order, its internal discipline and its relations with the secular clergy, among other things.
[1] Since the truces that Alfonso VIII of Castile had signed with the Almohads prevented the order from fulfilling its purpose of fighting them, Fernando received Innocent III's approval to bring his knights into the service of King Peter II of Aragon.
A contrary report is given by Francisco de Rades y Andrada [es], according to which Fernando died shortly after the conquest of Montalbán and was buried in Alarcón.