Fort Saint-André, Military fort in Salins-les-Bains, France.

Fort Saint-André is a fortification positioned above Salins-les-Bains with strong defensive walls and observation points overlooking the surrounding valleys. The site now contains several buildings within its walls, including accommodation spaces and a former chapel.

A tower built in 1255 by Jean de Chalon to guard the saltworks was destroyed in a siege and rebuilt in 1347, then reinforced with a rampart and barracks between 1638 and 1645. After the French conquest of 1668, Vauban rebuilt the fort from 1674 to 1679 for Louis XIV; the first stone was laid on 18 October 1674. It resisted the Duke of La Feuillade for 16 days in June 1674.

The fort's name changed during the French Revolution, when it was provisionally called Fort-Égalité. In 1682 Louvois had two rooms fitted out here for about a dozen people linked to the Affair of the Poisons, including Robert de Lamiré de Bachimont and his wife Marie de La Haye de Saint Hilaire. Since 2006 the site has housed 40 holiday cottages, and it opened to guided tours by reservation in December 2022.

The fort sits on a hilltop and requires climbing to explore, though it offers views across the surrounding landscape. Visitors should wear sturdy footwear and allow time to explore the various areas of the site.

In 1682 Louvois ordered two rooms fitted out in the fort for about a dozen people caught up in the Affair of the Poisons, among them Robert de Lamiré de Bachimont and his wife Marie de La Haye de Saint Hilaire. The head front was restored in 1818, and between 1833 and 1841 its bastion was turned into a demi-lune while the north gate was walled up.