The IX Corps of the Grande Armée was a French military unit that existed during the Napoleonic Wars.

The corps was first formed in 1806 from German troops allied with the First French Empire, with Emperor Napoleon I appointing his brother Jérôme Bonaparte as commander.

The IX Corps was reformed in 1812 for the French invasion of Russia and Marshal Claude Victor-Perrin was assigned to lead it.

Victor's troops fought in several actions, most notably at the Battle of Berezina in November.

The formation was re-established in 1813 with Marshal Pierre Augereau as its commander and fought at Leipzig.