This is a list of the queens consort and kings consort of the Kingdom of Castile, and later, Crown of Castile.
It is, in part, a continuation of the list of Asturian royal consorts and the list of Leonese royal consorts.
At 1556, the union of the Spanish kingdoms is generally called Spain and Mary I of England (second wife of Philip II) is listed as the first Queen consort of Spain.