The Lake Simcoe Region Conservation Authority is a conservation authority established in 1951, and is among the oldest in the Canadian province of Ontario. The LSRCA is responsible for the waters, wildlife, and plants within the Lake Simcoe watershed, and has expanded and upgraded its reach and conservation areas several times in the past, gradually assuming control of the Lake Simcoe Watershed in neighbouring regions, such as York RM, Durham RM, Simcoe County, and the City of Kawartha Lakes.