Castilian or Castillian may refer to:
Castile, a historic region of the Iberian peninsula Castilian people, an ethnic group from Castile Castilian languages, a branch of the West Iberian languages consisting of all linguistic varieties descended from Old Latin Spanish language, a Romance language that originated in Castile Castilian Spanish, a variety of Peninsular Spanish spoken in Spain Crown of Castile, a former state on the Iberian Peninsula Kingdom of Castile, a former kingdom on the Iberian Peninsula Castile and León, an autonomous community of Spain Castile–La Mancha, an autonomous community of Spain SS Castilian, steamer ships The Castilian, a 1963 film Castilian War, a war between several sultanates and the Spanish Empire.
See also Castile (disambiguation) Nationalities of Spain (disambiguation)