The 9th Army Corps (French: 9e Corps d'Armée) was a large military formation (military) of the French Army, constituted during the First and the Second French Empire, and during the First and the Second World War.
The 9e corps d'armée was founded in 1809 under Marshal Bernadotte, regrouping Saxon troops allied with France. The 9e Corps notably saw action during the Battle of Wagram.
At the mobilisation, the 9e Army Corps was constituted near Tours as a subunit of the Second Army. The 9e Corps comprised two infantry divisions, the 17th and 52nd, and the Division Marocaine, a colonial infantry division.
In early September 1939, the 9e Corps was re-created in Tours, under general Émile Laure, from elements of the 9th military region. It was a part of the Fourth Army, under General Edouard Réquin, itself a part of the French 2nd Army Group which charged with the defence of the Maginot Line.
From late 1939 to May 1940, the 9e Corps was deployed around the Saint-Avold - Faulquemont sector, in Moselle, with the general staff in Landroff. Two infantry divisions defended the fortified sector.