The lieutenant governor of Newfoundland and Labrador is the representative in Newfoundland and Labrador of the monarch, who operates distinctly within the province but is also shared equally with the ten other jurisdictions of Canada, as well as the other Commonwealth realms and any subdivisions thereof, and resides predominantly in his oldest realm, the United Kingdom. The lieutenant governor of Newfoundland and Labrador is appointed in the same manner as the other provincial viceroys in Canada and is similarly tasked with carrying out most of the monarch's constitutional and ceremonial duties. The current, and 15th lieutenant governor of Newfoundland and Labrador is Joan Marie Aylward, who has served in the role since 14 November 2023.

By the arrangements of the Canadian federation, the Canadian monarchy operates in Newfoundland and Labrador as the core of the province's Westminster-style parliamentary democracy. As such, the Crown within Newfoundland and Labrador's jurisdiction is referred to as the Crown in Right of Newfoundland and Labrador, His Majesty in Right of Newfoundland and Labrador, or the King in Right of Newfoundland and Labrador. The Constitution Act, 1867, however, leaves many royal duties in the province specifically assigned to the sovereign's viceroy, the lieutenant governor of Newfoundland and Labrador, whose direct participation in governance is limited by the conventional stipulations of constitutional monarchy.