Botsford Lake is a lake in the Hudson Bay drainage basin in Kenora District in northwestern Ontario, Canada. It is about 15 kilometres (9 mi) long and 2.2 kilometres (1.4 mi) wide, is at an elevation of 357 metres (1,171 ft), and lies between the settlements of Superior Junction and McDougall Mills; Rosnel is on the south shore of the lake. The CN transcontinental rail line travels the along the entire south shore.