Col du Galibier, Mountain pass in Savoie and Hautes-Alpes, France.

Col du Galibier is a mountain pass situated at 2,642 meters (8,668 feet) connecting Saint-Michel-de-Maurienne to Briançon through the southern French Alps. The road crosses the summit through a tunnel carved into the mountainside, with two distinct approach routes on either side.

A first passable road between Maurienne and Briançon opened in 1876, crossing the ridge at 2,658 m, 16 m higher than the present road. The 363-metre summit tunnel was built in 1890 and opened in 1891. Closed in 1975 because stones were coming loose from its vault, it reopened in 2002 as a single lane controlled by traffic lights, after a new road had been built over the summit.

The name is recorded as early as 1183, when the Regeste dauphinois mentions "in collo Galaubiae"; later forms include Custodia collis Galiberii (1516) and Galibier (1754). It appears to derive from a Germanic personal name. At the south portal of the tunnel stands a monument to Henri Desgrange, inaugurated on 19 July 1949, where a wreath is laid whenever the Tour de France crosses the pass.

The road is typically passable from June through October, with closures from November to May due to heavy snow. Travelers should check current conditions before departing and be prepared for rapidly changing weather at this elevation.

The true topographic saddle lies about 400 metres west of the road pass, at 2,593 metres, 49 metres lower and unnamed. The road instead crosses the crest higher up, on the Galibier ridge descending from the Grand Galibier. Gypsum outcrops above the tunnel form decametre-wide dissolution funnels that some visitors mistake for shell craters.