Col de la Pierre Saint-Martin (elevation 1,766 m (5,794 ft)) is a mountain pass on the France–Spain border in the western Pyrenees in the department of Pyrénées-Atlantiques (France) and Navarra (Spain).

In 2015, on Bastille Day, the tenth leg of the Tour climbed the Col in the other direction, from Arette up to the village of Pierre Saint Martin, which hosted the end of a stage for the first time ever.

The southern side of the climb, starting from Isaba (Navarra, Spain) is 27 km (17 mi) long at an average gradient of 3.6% (height gain – 966 m (3,169 ft)).

Starting from Arette (north east), the climb is 23.5 km (14.6 mi) long gaining 1,301 m (4,268 ft) (an average gradient of 5.5%).

[1] The climb from the south featured in 2007 in the Tour de France for the first time on the 218.5 km (135.8 mi) stage 16 from Orthez to Gourette–Col d'Aubisque.