Fort du Mont Bart is located to the south of Montbéliard, France.

It was built between November 1874 and July 1877 as part of the Séré de Rivières system of fortifications.

The fort overlooks the valleys of the Doubs and the Allan at an elevation of 497 metres (1,631 ft), standing to the south and rear of the fortified region of Belfort and in control of the road to Besançon.

The most striking feature of the Fort du Mont Bart is its "interior street", originally constructed in the open air as a sunken court, then covered before World War I with reinforced concrete.

The central barracks is sunken into the earth and encircled by firing positions on the surface of the fort.