What is constitutional monarchy in Canada?

Constitutional monarchy is the Canadian system of government in which the King is the head of state and the source of executive authority, but real political power is exercised by the elected Prime Minister and Cabinet, who must maintain the confidence of the House of Commons. Canada is one of 15 Commonwealth realms that share the same monarch (Charles III since September 8, 2022) but operate as independent constitutional monarchies. The system combines monarchy (a single head of state who is not elected) with parliamentary democracy (an elected legislature and an executive that is accountable to it).

The Canadian constitutional monarchy operates by both written rules and unwritten conventions. The Constitution Acts of 1867 and 1982 are the principal written sources, establishing the Crown's authority (section 9 of the Constitution Act, 1867), the office of the Governor General, the Senate, the House of Commons, the courts, the Charter of Rights and Freedoms, the amending formula, and the federal-provincial division of powers. The Letters Patent of 1947 govern the office of the Governor General. Constitutional conventions (unwritten rules) govern the Crown's role in practice, including the rule that the Governor General acts on the advice of the Prime Minister in nearly all matters.

Three principles distinguish Canadian constitutional monarchy from absolute monarchy or republicanism. First, the rule of law: the King is bound by the Constitution and statute, not above them. Second, parliamentary sovereignty within the constitutional framework: Parliament can change most laws by ordinary majority, subject to constitutional limits including the Charter and the federal-provincial division of powers. Third, responsible government: the Prime Minister and Cabinet must maintain the confidence of the elected House of Commons. Together these principles ensure that constitutional monarchy operates as a democratic system.

Canada's constitutional monarchy is among the more decentralised in the world. The provincial Crown system gives each province its own constitutional personality, with provincial Lieutenant Governors performing functions parallel to those of the federal Governor General. Section 41(a) of the Constitution Act, 1982 (the unanimity amending formula) requires unanimous consent of Parliament and all 10 provincial legislatures to alter the office of the Queen, the Governor General, or the Lieutenant Governor of a province. Reference re Senate Reform (2014) confirmed the high bar for monarchical reform. Public opinion in Canada has shifted gradually toward republican views since the 1990s, but the constitutional difficulty of change has kept the monarchy intact.