Alberta Provincial Highway No. 55, commonly referred to as Highway 55, is a 263-kilometre (163 mi) long east–west highway in northeast Alberta, Canada. It extends from the Saskatchewan border in the east through the Cold Lake, Lac La Biche, and Athabasca where it ends at Highway 2. In Saskatchewan, it continues as Saskatchewan Highway 55. The entire length of Highway 55 comprises the easternmost segment of Alberta's portion of the Northern Woods and Water Route (NWWR). West of Athabasca, the Northern Woods and Water Route continues westward along Highway 2 and then Highway 49.