Fort Saint-Louis, Coastal fortification in Le Mourillon, Toulon, France

Fort Saint-Louis, also called fort des Vignettes, is a cannon tower built in 1534 by the engineer Saint-Rémy at the request of François I. Two joined stone masses stand at the water's edge: a taller block with a low parapet and three squared openings above a projecting wall pierced by an arched window, and a lower rounded bastion of paler stone with reddish brickwork and a barred window.

François I had the fort built in 1534 by the engineer Saint-Rémy, four years after Barbary pirates sacked Toulon and carried off captives; it was first called fort des Vignettes, after the roadstead it guarded. From 1692 to 1699 Antoine Niquet, with Pierre Puget and Vauban, rebuilt and enlarged it as part of the fortification of Toulon and the expansion of the arsenal. Partly destroyed during the siege of Toulon in 1707, it was rebuilt to the same design and took its present name.

The fort's name changed after its identical reconstruction following the 1707 siege of Toulon: it had been the fort des Vignettes, after the rade des Vignettes whose entrance it guarded. Since 2010 it has served as a restaurant reserved for military personnel, notably the Marine nationale, and opens to the public only during the Journées du patrimoine.

Since 2010 the fort has been a restaurant reserved for military personnel, notably the French Navy, and is no longer open to the public except on European Heritage Days. It stands at the water's edge in Le Mourillon, and the quay railing in front gives a close view of the two joined blocks and the small arched opening at water level.

The fort was partly destroyed during the 1707 siege of Toulon and then rebuilt to the same design, which is when it took the name Saint-Louis. It has been listed as a monument historique since 29 November 1948. Since 2010 it has opened to the public only during the Journées du patrimoine, as it now serves as a restaurant for military personnel, notably the Marine nationale.