The Strait of Belle Isle (French: détroit de Belle Isle (Beautiful Island)) is a waterway in eastern Canada that separates the Labrador Peninsula from the island of Newfoundland, in the province of Newfoundland and Labrador.
The strait is the northern outlet for the Gulf of Saint Lawrence, the other two being the Cabot Strait and Strait of Canso. As such, it is also considered part of the Great Lakes-St. Lawrence Seaway system. The strait is approximately 125 kilometres long and ranges from a maximum width of 60 km to just 15 km at it narrowest, the average width being 18 km.
The name is derived from Belle Isle (Beautiful Island), located at the extreme eastern end of the strait and roughly equidistant between Table Head, Labrador, and Cape Bauld, Newfoundland.
Navigation in the strait can be extremely hazardous with strong tidal currents interacting with the Labrador Current, depths reaching several hundred metres in places, sea ice for 8–10 months of the year, and variable weather conditions including gales and fog. While sea ice prevents year-round shipping, the Canadian Coast Guard maintains a vessel traffic service (VTS) to ensure collisions do not occur. The VTS is voluntary currently.
A ferry service operates at the western part of strait between St. Barbe, Newfoundland, and Blanc Sablon, Quebec. New road construction for the Trans-Labrador Highway resulted in the removal of ferry services to outports in the northeastern part of the strait in 2002.