Fort Saint-Jean, Military fort in 1st arrondissement of Lyon, France

Fort Saint-Jean is a fortified structure that rises steeply above the Saône River on the city's high ground. The fort features fortified walls, an open parade ground, and stone buildings arranged within its defensive perimeter.

Construction of the fort began in 1834, replacing an earlier 16th-century fortification on the same site. It was built as part of Lyon's first major defensive system to protect the city as it expanded.

The National School of Public Finance now occupies the fort, maintaining educational traditions while preserving the structure's military architectural heritage.

The fort is not open to the public: since 2004 it has housed the National School of Public Finance, which trains public finance controllers, and only occasionally hosts cultural events. Its walls rise 40 m above the Saône, and the Halincourt gate, built in 1639, blocks the quay at the fort's corner. The building can be seen from the riverside and the street below.

On 2 September 1944, while Lyon was under German occupation, volunteers gathered inside the fort to stop the occupiers from blowing up the bridges over the Saône. The fort had held the regional pharmacy of the military health service since 1932, and in 1984 it passed to the veterinary service of the armed forces.