The VIII Corps of the Grande Armée was the name of a French military unit that existed during the Napoleonic Wars. Emperor Napoleon formed it in 1805 by borrowing divisions from other corps and assigned it to Marshal Édouard Adolphe Casimir Joseph Mortier. Marshal André Masséna's Army of Italy was also reorganized as the VIII Corps at the end of the 1805 campaign. The corps was reformed for the 1806 campaign under Mortier and spent the rest of the year mopping up Prussian garrisons in western Germany.