The official language of Spain is Spanish, known within the country as Castilian (castellano), and it is spoken by virtually all of the nation's roughly 47 million residents. Alongside Spanish, the constitution grants co-official status to several regional languages in their respective territories: Catalan, Basque, Galician, and Aranese. This mix of one national tongue and a handful of deeply rooted regional ones makes Spain one of Europe's most linguistically layered countries.
Spanish (Castilian): The National Language
Castilian Spanish is official across all of Spain and serves as the common language that ties the country's diverse regions together. It belongs to the Romance family, descended from the Vulgar Latin spoken by Roman settlers in Hispania, which makes it a close cousin of Portuguese, Italian, French, and Romanian. The language first took shape in the medieval Kingdom of Castile in north-central Spain and spread southward during the centuries-long Reconquista.
Globally, Spanish is enormous. With more than 580 million speakers, it ranks as the fourth most spoken language in the world overall and the second most spoken by native speakers, trailing only Mandarin Chinese. Most of those speakers live not in Spain but in Latin America, a legacy of the colonial expansion that carried the language across the Atlantic from the late 15th century onward. The Royal Spanish Academy (Real Academia Española, or RAE), founded in 1713, remains the authority that standardizes spelling, grammar, and vocabulary.
Co-Official Regional Languages
Spain's 1978 constitution recognizes that Spanish is not the only language Spaniards speak. In several autonomous communities, regional languages share official status with Castilian and are used in schools, government, media, and daily life:
- Catalan — spoken by around 10 million people across Catalonia, Valencia (where the local variety is called Valencian), and the Balearic Islands. It is a Romance language in its own right, not a dialect of Spanish, and has more speakers than several EU national languages such as Danish or Finnish.
- Galician (galego) — spoken by roughly 2.4 million people in Galicia, in the northwest. It is closely related to Portuguese, with which it shares medieval roots.
- Basque (Euskara) — spoken by about 750,000 people in the Basque Country and parts of Navarre.
- Aranese — a variety of Occitan spoken by a few thousand people in the small Pyrenean valley of Val d'Aran in Catalonia.
Basque: Europe's Great Mystery
Basque deserves special attention because it is a true language isolate, meaning it has no known relatives anywhere in the world. While Spanish, Catalan, and Galician all trace back to Latin, and Latin itself belongs to the vast Indo-European family, Basque does not. Linguists believe it predates the arrival of Indo-European languages in Europe by thousands of years, making it a surviving fragment of a far older linguistic landscape. Spoken on both sides of the western Pyrenees in Spain and France, Euskara is often described as the oldest living language in Europe, and it remains a powerful symbol of Basque cultural identity.
Dialects and Regional Accents
Even within Castilian Spanish, pronunciation varies notably from region to region. The clearest divide is between the Castilian Spanish of the center and north and the Andalusian Spanish of the south. Andalusian speakers often drop final consonants, soften or merge sounds, and use distinctive vocabulary, giving the southern accent a quite different feel. The Spanish of the Canary Islands sounds closer to Latin American Spanish, a result of centuries of migration between the islands and the Americas. One feature that distinguishes Spain from most of Latin America is the everyday use of vosotros, the informal plural form of "you," which has largely disappeared overseas.
Language, Politics, and Travel
Language in Spain is closely tied to regional identity and politics, especially in Catalonia and the Basque Country, where it features prominently in debates over autonomy. For visitors, however, the picture is simpler: Spanish works everywhere, and learning a few phrases goes a long way. Useful basics include hola (hello), gracias (thank you), sí and no, ¿cuánto cuesta? (how much does it cost?), ¿habla inglés? (do you speak English?), and ¡socorro! (help!). For more on the country's regions, culture, and geography, see our spain country guide.
Frequently Asked Questions
What is the main language of Spain?
The main and only nationwide official language is Spanish, called Castilian (castellano) within Spain. It is spoken by nearly the entire population and used in national government, education, and media.
How many languages are spoken in Spain?
Spanish is the national language, and four regional languages have co-official status in their territories: Catalan, Galician, Basque, and Aranese. Several of these have their own dialects and local varieties as well.
Is Catalan a dialect of Spanish?
No. Catalan is a distinct Romance language, not a dialect of Spanish. It evolved separately from Latin and is spoken by around 10 million people, with co-official status in Catalonia, Valencia, and the Balearic Islands.
Why is Basque so different from Spanish?
Basque is a language isolate with no known relatives. Unlike Spanish, which descends from Latin and the Indo-European family, Basque predates Indo-European languages in Europe, which is why it shares almost nothing with the languages around it.