Spain has many dialects. Dialects can be so specific that a particular village can be identified. A Spaniard in Madrid identified me as being from Rota, Spain. His statement was "I'm from Jerez, and I recognize the accent". I learned a lot of my pronunciation, up to that time, in Rota. Jerez is a city about 20 miles away. Neither of those locations speak Castilian Spanish.
If you are asking about languages then it has one official language Castilian Spanish. It also has three other regional languages, Galician, Catalan, and Basque. These are completely stand alone languages that are not Spanish based.
Astur-Leonese dialects are spoken in Spain, in the regions of León, Zamora, and Salamanca
Galician is spoken in the region of Galicia, which is an autonomous community in northwest Spain.
With the exception of Basque, all of Spain's languages developed as different dialects of Hispanic Latin (which developed in Spain due to the Roman Empire's arrival). These dialects changed over time due to pronunciation differences between regions. Basque is believed to be a language that pre-dated the arrival of Indo-European languages to Europe.
Dialects are a variation of the same language. In Spain the basic language is Spanish. Andalucia is one basic dialect but believe it or not there are dialects within Andalucia so distinct that a specific village can be identified. Castillian is a dialect also. It just happens to be the dialect recognized by the Spanish Royal Academy as the correct way to speak Spanish. There are other dialects in the same areas where regional languages are spoken. Regional languages spoken in Spain are not Spanish languages, they are differant languages. They are Catalonia (around Barcelona), Galician (around Bilbao), and Basque which is spoken in the area between the other two languages.
Castellano, another name for Spanish, is primarily spoken in Spain and in many countries in Latin America. It is also the official language of many international organizations, including the United Nations.
Mexican Spanish and European Spanish are dialects of each other, just as British English and North American English are dialects of each other.
... Spanish. Other languages spoken in Spain are the two primary dialects of Spanish, Castellano and Aragonese. Catalan is also spoken in Spain as is Occitan.
There are many Spanish dialects, with variations in accent, vocabulary, and pronunciation. Generally, Spanish is categorized into five main regional dialects: Peninsular Spanish (Spain), Latin American Spanish (Central and South America), Caribbean Spanish, Mexican Spanish, and Equatoguinean Spanish.
They speak the same language, but with different dialects. They both like siestas and fiestas. They love tapas and other Spanish stuff!
In Castilla-La Mancha, Spain, the main languages spoken are Spanish (Castilian) and various regional dialects of Spanish such as Extremaduran and Castilian-Manchego. Some regions may also have speakers of other languages or dialects like Aragonese or Galician due to historical influences.
The Mexican Spanish language originates from Spain, as a result of the Spanish colonization of Mexico in the 16th century. Over time, Spanish mixed with indigenous languages to create various regional dialects of Spanish in Mexico.
The official language of Portugal is Portuguese, which is spoken by nearly everyone there. There are some local dialects (variations of the language) used in the Azore Islands or in parts of Portugal near the border with Spain, especially in the northern parts, but even people who speak these dialects use Portuguese to outsiders.