How to Say "castilian" in Spanish
The most common Spanish word for “castilian” is “español” — use 'español' as the most general and widely accepted term for the Spanish language when speaking with native speakers from any region..
español
Examples
¿Estás estudiando español?
Are you studying Spanish?
castellano
/kas-te-YA-no//kasteˈʝano/

Examples
En Argentina, la gente suele decir que habla castellano.
In Argentina, people usually say they speak Spanish.
Prefiero estudiar castellano porque me gusta el acento de Madrid.
I prefer to study Castilian because I like the Madrid accent.
El castellano es uno de los idiomas más hablados del mundo.
Spanish is one of the most spoken languages in the world.
El queso castellano es famoso por su sabor fuerte.
Castilian cheese is famous for its strong flavor.
Castellano vs. Español
In most contexts, these words are identical. 'Castellano' specifically refers to the region of Castile, where the language originated.
Capitalization Rules
Unlike in English, names of languages like 'castellano' are not capitalized in Spanish unless they start a sentence.
Matching the Noun
Remember that the ending changes based on what you are describing: 'un hombre castellano' but 'una mujer castellana'.
Capitalization error
Mistake: “Hablo Castellano.”
Correction: Hablo castellano. (Languages are not capitalized in Spanish).
Gender agreement
Mistake: “La cultura castellano.”
Correction: La cultura castellana. (Adjectives must match the gender of the object they describe).
castellano
/kas-te-YA-no//kasteˈʝano/

Examples
El queso castellano es famoso por su sabor fuerte.
Castilian cheese is famous for its strong flavor.
En Argentina, la gente suele decir que habla castellano.
In Argentina, people usually say they speak Spanish.
Prefiero estudiar castellano porque me gusta el acento de Madrid.
I prefer to study Castilian because I like the Madrid accent.
El castellano es uno de los idiomas más hablados del mundo.
Spanish is one of the most spoken languages in the world.
Castellano vs. Español
In most contexts, these words are identical. 'Castellano' specifically refers to the region of Castile, where the language originated.
Capitalization Rules
Unlike in English, names of languages like 'castellano' are not capitalized in Spanish unless they start a sentence.
Matching the Noun
Remember that the ending changes based on what you are describing: 'un hombre castellano' but 'una mujer castellana'.
Capitalization error
Mistake: “Hablo Castellano.”
Correction: Hablo castellano. (Languages are not capitalized in Spanish).
Gender agreement
Mistake: “La cultura castellano.”
Correction: La cultura castellana. (Adjectives must match the gender of the object they describe).
General vs. Specific Language Terms
Related Translations
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