Lightning Lake is a lake located in E. C. Manning Provincial Park, British Columbia, Canada. The lake is freshwater and is located within the Similkameen-Okanogan forest district. The lake is unusual as it drains in two directions, into Flash Lake in the south and the Similkameen River to the north. The current lake is not a naturally occurring lake, as at the north end, near the day-use area, there is an earthen dam.