The flag of the Northwest Territories is the subnational flag of the Northwest Territories of Canada. It was adopted in 1969 by the Legislative Assembly of the Northwest Territories.

Hudson's Bay Company flag

thumb|left|Hudson's Bay Company Flag

The NWT had no flag of its own during its early history, but the flag of the Hudson's Bay Company continued to be used at that company's forts, stores and other establishments. The Legislative Assembly of the NWT was created in 1951.

Current flag

The Northwest Territories' first official flag was chosen by a special committee of the Legislative Assembly of the Northwest Territories in 1969. The committee reviewed entries from a Canada wide contest. The winner of the contest was Robert Bessant from Margaret, Manitoba.

thumb|NT flag at the [[2017 Canada Games]]

The flag features a blue field, on which is a Canadian pale (a white stripe taking up half the width of the flag), with at the centre, the shield from the coat of arms of the Northwest Territories. The blue represents the abundant waters of the territory, whereas the white represents snow and ice.