Vielha e Mijaran (Occitan pronunciation: [ˈbjeʎa e miʒaˈɾan]) is a municipality in central Aran, Catalonia, Spain. It is the capital and largest municipality of the region, with a population of 5,865 (register office, 2025) 
. It is part of the terçons of Castièro and Marcatosa.
It was created in 1970 by the merger of the municipalities of Arròs e Vila, Betlan, Escunhau, Gausac, Vielha and Vilac as Viella – Mitg-Aran: some of the former municipalities retain some privileges as "decentralised municipal entities" (entitats municipals descentralitzades, EMD), as does the village of Betren. Mijaran literally means "Middle Aran" in Aranese, as the inhabited part of the municipality is situated in the valley of the Garonne (Garona). The Noguera Ribagorçana has its source on the territory of the municipality, on the opposite side of the watershed. The ajuntament (town hall) is in Vielha, spelled Vielha in Occitan and Viella in Catalan and Spanish, which is also the capital of Aran and also the seat of the Conselh Generau d'Aran.