Ferdinand of Castile may refer to:
Fernando Ansúrez I (died 929), count Fernán González of Castile (died 970), count Ferdinand I of León and Castile (died 1056), king Ferdinand of Castile (died 1211), infante Ferdinand III of Castile (died 1252), king Ferdinand of Castile (born 1238), infante Ferdinand de la Cerda (died 1275), infante Ferdinand IV of Castile (died 1312), king Ferdinand II of Aragon and V of Castile (died 1516), king