Eustache Charles Joseph d'Aoust (27 February 1763, Douai – 2 July 1794, Paris) was a general officer during the French Revolutionary Wars. He started his military career in the Old Regime army and served on the staffs of three of the early army commanders and later fought in the War of the Pyrenees against the Kingdom of Spain. On three separate occasions he commanded the Army of the eastern Pyrenees, but he shared the fate of two previous commanders when he was arrested and guillotined by the Committee of Public Safety.