In Canada, a lieutenant governor is the representative of the King of Canada in the government of each province. The Governor General of Canada appoints the lieutenant governors on the advice of the Prime Minister of Canada to carry out most of the monarch's constitutional and ceremonial duties for an unfixed period of time—known as serving "His Excellency’s pleasure"—though five years is the normal convention. Similar positions in Canada's three territories are termed "Commissioners" and are representatives of the federal government, not the monarch directly.

The monarchy of Canada is Canada's form of government embodied by the Canadian sovereign and head of state. It is one of the key components of Canadian sovereignty and sits at the core of Canada's constitutional federal structure and Westminster-style parliamentary democracy. The monarchy is the foundation of the executive (King-in-Council), legislative (King-in-Parliament), and judicial (King-on-the-Bench) branches of both federal and provincial jurisdictions. The current monarch is King Charles III, who has reigned since 8 September 2022.