The Col de Crête Sèche (French: dry ridge pass) or Colle di Crête Sèche (Italian) is a mountain pass in the Alps, located between Switzerland and Italy. It lies at a height of above sea level, between the massifs of Mont Gelé and Bec d'Epicoune, in the Pennine Alps. It connects Fionnay in the Swiss canton of Valais on its northern side to Bionaz in the Italian region of the Aosta Valley on its southern side. The Col de Crête Sèche is the second-lowest pass between the valleys of Bagnes and Valpelline, after the Fenêtre de Durand which lies about one hundred metres lower west of Mont Gelé.