Col du Lautaret is a high mountain pass in the department of Hautes-Alpes in France. It marks the boundary between the valleys of the Romanche and the Guisane, a tributary of the Durance which has its source at the col. The valleys are linked by the route départementale 1091. The Lautaret is one of the lowest points on the ridge line which separates the "north" and "south" geographic areas of the French Alps.