Oliana is a municipality in the comarca of the Alt Urgell in Catalonia, Spain. It is situated in the Segre valley immediately below the Oliana reservoir. There is a factory of domestic electrical appliances in the town, and the presence of non-farming employment has meant that Oliana has escaped the depopulation experienced by most municipalities in north-west Catalonia. It is currently the second-largest town (by population) in the Alt Urgell, behind the comarcal capital La Seu d'Urgell. The town is served by the C-14 road between Ponts and La Seu d'Urgell.