Holà / Salut !
The principal languages in the Principality of Andorra / Andorre is Catalan (Català), followed by the French language. So, most sites will be in these languages, although some have English and fewer Castilian (Castellano) « Spanish ».
The first two I list below are for genealogie societies. The others are for the best genealogy research in Andorra:
La Socetat Catalana de Genealogia SCGHSVN (Català):
http://www.scgenealogia.org/Association Catalane de Généalogie (Français & Català)
(with info about more than 680,000 record extractions online available through Genealogie.com - pay subscription site below)
http://actes.acg66.org/actes/index.php-- and --
http://www.genealogy.tm.fr/minitel/m-66.htmGenealogie.com (record extractions for Andorra - direct) (Français)
http://www.genealogie.com/ (I am a member)
Arxiu Nacional d'Andorra (Català & English):
http://www.arxius.ad/Biblioteca Nacional - Govern d'Andorra (Català & Français)
http://www.bibliotecanacional.ad/also see:
Yahoo Groupes - GenAndorra (Français & Català)
http://fr.groups.yahoo.com/group/genandorre/Una bona investigació ! / Bonne quête !