The Port de Lers (or Port de l'Hers or Port de Massat) (elevation ) is a mountain pass in the French Pyrenees in the department of Ariège, between the communities of Aulus-les-Bains (west), Massat (north) and Vicdessos (east).
Starting from Vicdessos, the climb is long. Over this distance, the climb is (an average of 7.0%), with the steepest section being at 10.9%.
Starting from Massat, the climb is long. Over this distance, the climb is (an average of 5.2%), with the steepest sections being at 8.9%.
The Port de Lers was first used in the Tour de France in 1995, since when it has featured seven times, most recently in 2024.