Lady Evelyn-Smoothwater Provincial Park is a remote wilderness park in northeastern Ontario, Canada, north of Lake Temagami. It is one of five provincial parks located in the Temagami area. This park encompasses Smoothwater Lake, , the Ishpatina Ridge (highest point in Ontario), Maple Mountain (highest vertical rise in Ontario), and most of the Lady Evelyn River. The park also includes many waterfalls, such as Helen Falls, the highest waterfall on the Lady Evelyn River.