The lieutenant governor of Nova Scotia is the representative in Nova Scotia 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 Nova Scotia 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 present, and 33rd lieutenant governor of Nova Scotia is Arthur Joseph LeBlanc, who has served in the role since 28 June 2017.

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