The Colagne (French: la Colagne) is a 58.5-kilometre (36.4 mi) long river in the Lozère département, southeastern France. Its source is in Arzenc-de-Randon. It flows generally southwest. It is a right tributary of the Lot into which it flows between Saint-Bonnet-de-Chirac and Le Monastier-Pin-Moriès.