In the practice of international law, command responsibility (also superior responsibility) is the legal doctrine of hierarchical accountability for war crimes, whereby a commanding officer (military) and a superior officer (civil) are legally responsible for the war crimes and the crimes against humanity committed by their subordinates; thus, a commanding officer always is accountable for the acts of commission and the acts of omission of their soldiers.
In the late 19th century, the legal doctrine of command responsibility was codified in the Hague Conventions of 1899 and 1907, which are partly based upon the Lieber Code (General Orders No. 100, 24 April 1863), military law that legally allowed the Union Army to fight in the regular and the irregular modes of warfare deployed by the Confederacy during the American Civil War (1861–1865). As international law, the legal doctrine and the term command responsibility were applied and used in the Leipzig war crimes trials (1921) that included the trial of Captain Emil Müller for prisoner abuse committed by his soldiers during the First World War (1914–1918).