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I’ll name only a number of the clubs from selected regions of official languages. The four main languages in Spain; 1. Castilian (Spanish spoken in all of Spain) All clubs communicate in Castilian (Spanish) in Spain. 2. Basque (Basque region) Athletic Bilbao, Real Sociedad, Eibar, Osasuna (even though they’re not in the Basque region and in Navarra), Alavés, Real Unión de Irún, Arenas Club, Sestao SC. 3. Catalan (Catalonia) FC Barcelona, RCD Espanyol, Sabadell, Girona, Badalona, Cornellà, Gimnastic de Tarragona, L’Hospitalet, Lleida, Reus, Sant Andreu. 4. Galician (Galicia) Deportivo La Coruña, Celta Vigo, Ourense, CD Lugo, Pontevedra CF, Racing Ferrol, RCD Fabril, SD Compostela. Then you have other regions with their own dialects that I won’t go into because in general Castilian is spoken there. But in the region of Valencia they speak a dialect of Catalan called Valencià so you can add clubs like Valencia CF, Levante, Villarreal and Elche to the list above.

Off topic, but do yourselves a favour and watch this incredible Monaco GP 1962 footage: It's stunning