Marie Eugène Debeney (5 May 1864 – 6 November 1943) was a French Army general. He commanded a corps at the Battle of the Somme then, in the second half of 1917, served as chief of staff to the French Commander-in-Chief Philippe Pétain. He then commanded the First Army which, fighting alongside British Empire forces, played an important role in the mobile fighting of 1918, including at the Battle of Amiens and the Storming of the Hindenburg Line. He later served an important term as Chief of the General Staff of the French army in the 1920s.