The Fort de la Croix-de-Bretagne is a fortification in the vicinity of Briançon in the Dauphiné region of southeastern France. It was built as part of the Séré de Rivières system of fortifications in 1876-79 to defend France against invasion from Italy, at a cost of 1,416,642 francs. It overlooks the valley of the Durance from an altitude of and monitors the Cervière road to Italy. The position was used by the French Army in the defense of Briançon until 1940, when it was part of the Fortified Sector of the Dauphiné.