The VIII Corps of the Grande Armée was a French military unit that existed during the Napoleonic Wars. Emperor Napoleon I formed it in 1805 by borrowing divisions from other corps and assigned it to Marshal Édouard 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.

Édouard Adolphe Casimir Joseph Mortier, Duke of Treviso, was a French military commander and Marshal of the Empire under Napoleon I, who served during the French Revolutionary Wars and the Napoleonic Wars. He served as Minister of War and Prime Minister of France from 1834 to 1835. He was one of 18 people killed in 1835 during Giuseppe Marco Fieschi's assassination attempt on King Louis Philippe I.