12th Army Corps (French: 12^e Corps d'Armée) was an army corps in the French Army. Commanded by Général Lebrun in the Franco-Prussian War then by General Galliffet from 1882 to 1886.

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On the outbreak of the First World War it was subordinated to Fourth Army.

It became part of the Tenth Army and was deployed in Italy from November 1917. It was later in action at the Second Battle of the Piave River and the Battle of Vittorio Veneto.

Its commanders in World War I were :

• 18 August 1913 : Pierre Auguste Roques
• 5 January 1915 : Henri Jean Descoings [fr]
• 12 May 1916 : Charles Nollet
• 25 October 1916 : Pierre Jean Charles Antoine Nourrisson
• 29 March 1918 : Jean César Graziani, also commander of all French forces in Italy.

• Achille Pierre Deffontaines