* Spain: Spanish is the official language of Spain and is spoken by the vast majority of the population.
* Andorra: While Catalan is the official language of Andorra, Spanish is widely spoken and understood, especially in business and tourism.
It's worth noting that:
* Portugal is also located on the Iberian Peninsula, but its official language is Portuguese.
* Gibraltar, a British Overseas Territory, also located on the Iberian Peninsula, speaks English.