Mérens-les-Vals (; Languedocien: Merens las Vals) is a commune in the Ariège department in southwestern France.
Mérens-les-Vals, as its name implies, has several valleys. The village is at the confluence of three valleys: Ariège, Nabre and Morgoulliou. The village has a train station (Mérens-les-Vals station) on the Portet-Saint-SimonâÂÂPuigcerdàrailway. The night train from Gare d'Austerlitz, Paris to Latour-de-Carol stops here. The journey taking about nine hours. There are six local trains a day to Toulouse, this journey takes 2 hours and 15 minutes.
Inhabitants are called Mérengois in French.