Which Romance language is the only official language of Andorra? Catalan.
Catalan is Andorra’s sole official language, a status set out in the country’s constitution. Andorra is unusual because it is the only sovereign state where Catalan is the official language across the entire country. The local variety is generally classified as Northwestern Catalan.
The language reflects Andorra’s historical ties to Catalonia and the wider Pyrenean region. It is used in government, national broadcasting, education, public signage, and many official services. Catalan is also related to Occitan and shares features with other Western Romance languages.
Spanish, Portuguese, and French are widely heard in Andorra because of immigration, tourism, and the country’s location between Spain and France. Their everyday visibility can make the official-language question seem less obvious, but widespread use does not give those languages official status. Catalan is therefore the single canonical answer, not Spanish or French.