Àger is a municipality in the comarca of the Noguera in Catalonia, Spain. It is situated in the north-west of the comarca, and the territory of the municipality stretches between the Noguera Ribagorçana and Noguera Pallaresa rivers. The Terradets reservoir on the Noguera Pallaresa is situated within the municipality. The village is linked to Balaguer and Tremp by the L-904 road.