Castle Junction is a locality where the northern extent of the Banff–Windermere Highway (Highway 93) intersects with the Trans-Canada Highway (Highway 1), the Bow River, and Bow Valley Parkway (Highway 1A) in Banff National Park, Alberta. It is named after the nearby Castle Mountain, clearly visible from the junction. The area is also referred to as Castle Mountain; however, the official location is approximately 1.6 km (1.0 mi) southwest of Castle Junction along the Canadian Pacific Railway.