Rodrigo (died 873) is the first count of Castile, reigning from about 850 to his death.

Some Iberian Muslim writers refer to a brother or brother-in-law of Ordoño I, while others assign the same role to a Ruderick without stating a relationship, and the references have been interpreted as referring to the same man.

This has been used by authors such as Fernández de Béthencourt, writing in 1897, to suggest that count Rodrigo was a son of Ramiro I of Asturias and his supposed second wife, 'Urraca Paterna' (actually just Paterna, Urraca being the wife of a later prince Ramiro) and half-brother of Ordoño, but Barrau-Dihago dismissed this interpretation for want of evidence.