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The Diocese of Urgell (Latin: Diœcesis Urgellensis) is a Latin Church diocese of the Catholic Church in Catalonia (Spain) and Andorra in the historical County of Urgell, with origins in the fifth century AD or possibly earlier. It is based in the region of the historical Catalan County of Urgell, though it has different borders. The seat and Cathedral of the bishop are situated in la Seu d'Urgell town. The state of Andorra is a part of this diocese.
Among its most notable events are Bishop Felix's adoptionist revolt, the coup of Bishop Esclua and the overthrowing of the bishop by members of aristocratic families (namely Salla i Ermengol del Conflent, Eribau i Folcs dels Cardona, Guillem Guifré de Cerdanya and Ot de Pallars) between the years 981 and 1122.
Also important is the diocese's patronage of Andorra, with the bishop holding the role of ex officio Co-Prince of Andorra jointly with the President of France (and formerly, the King of France or King/Emperor of the French). Andorra was ceded to the Bishop of Urgell by the Count Ermengol VI of Urgell in 1133.Up to 1802, the ecclesiastical border corresponded with the royal one established under the Treaty of the Pyrenees in 1659. As such the 33 towns of the northern Cerdanya (now in France) came under the diocese's control.