The X Corps of the Grande Armée was a French military formation active during the Napoleonic Wars.

Originally established in 1807 under the command of Marshal François Joseph Lefebvre, it was reconstituted in 1812 during the French invasion of Russia, with Marshal Jacques MacDonald assuming command.

[1][2] After the retreat from Russia, the X Corps was tasked with defending Danzig, under the leadership of General Jean Rapp.

The Siege of Danzig lasted from January 1813 to January 1814, ending with the surrender of the garrison.

Notably, the X Corps included a Prussian contingent that later became the foundation of the reformed Prussian Army in 1813.