Tatla Lake is a small unincorporated community in the west Chilcotin area of British Columbia, Canada, located at the west end of its eponymous lake. Situated 220 km west of Williams Lake along Highway 20, Tatla Lake's 123 people live approximately halfway between the two ends of the highway; Williams Lake to the east and the coastal community of Bella Coola to the west. The community is the service centre for three major mountain valleys of West Branch, Chilko and Tatlayoko. These valleys extend southward via secondary roads.