The Fort de Cindey (Swiss designation A155) is a component of Fortress Saint-Maurice, which is in turn one of the three principal fortified regions of the National Redoubt of Switzerland.

With the Fort du Scex, it comprises a fortress complex encased in rock high above the strategic Saint-Maurice valley.

The Château Saint-Maurice remains extant, while extensive fortifications on either side of the Rhône, constructed between 1831 and 1860 by General Guillaume Henri Dufour have disappeared.

Lateral branches to the interior of the mountain lead to troop accommodations, the command post, ammunition magazines and utility areas.

The fort was planned as a mixed artillery and infantry position that could provide supporting fire to the anti-tank barrier across the Rhône valley at Lavey.