Castilian is the official Spanish language of the State. However, Castilian is not the only Spanish language. At present, there are other Spanish languages, which make up a singularly rich linguistic patrimony.

The Spanish Constitution recognizes the right of the Autonomous Communities to use their own languages.

The Article 3 of the Constitution reads:

1. Castilian is the official Spanish language of the State. All Spaniards have the duty to know it and the right to use it.
2. The other Spanish languages shall also be official in the respective Autonomous Communities in accordance with their Statutes.
3. The wealth of the different language variations of Spain is a cultural heritage which shall be the object of special respect and protection.

The Spanish languages that are officially recognized by the Statutes of the Autonomous Communities are: Euskera (País Vasco and Navarra), Gallego (Galicia), Catalan (Cataluña and Islas Baleares) and Comunidad Valenciana where, as stated at the Dictionary of the Real Academia, this variety of Catalan is called Valenciano.

Other Statutes give special protection for the following Spanish languages: Bable in Asturias and the linguistic diversity in Aragón.