The commander-in-chief of the Canadian Armed Forces exercises supreme command and control over Canada's military, the Canadian Armed Forces. Constitutionally, command-in-chief is vested in the Canadian monarch, presently King Charles III. Since the Letters Patent, 1947, were signed by King George VI, the governor general of Canada—presently Mary Simon—executes most of the duties of the sovereign, including in his role as commander-in-chief. Consequently, the governor general also uses the title Commander-in-Chief of the Canadian Forces. By protocol, the title used within international contexts is Commander-in-Chief of Canada.

The Canadian Armed Forces are the unified military forces of Canada, including land, sea, and air commands referred to as the Canadian Army, Royal Canadian Navy, and the Royal Canadian Air Force. The CAF also operates several other commands, including the Canadian Forces Intelligence Command, the Canadian Joint Operations Command, and the Canadian Special Operations Forces Command. Personnel may belong to either the Regular Force or the Reserve Force, which has four sub-components: the Primary Reserve, Supplementary Reserve, Cadet Organizations Administration and Training Service, and the Canadian Rangers. Under the National Defence Act, the Canadian Armed Forces are an entity separate and distinct from the Department of National Defence, which also exists as the civilian support system for the forces.