|Primary inflows||Restoule River|
|Primary outflows||Restoule River|
|Max. length||9 miles (14 km)|
|Surface area||3,057 acres (12.37 km2)|
|Max. depth||30 m (98 ft)|
|Surface elevation||211 m (692 ft)|
|Islands||7 (Porter Island, Horseshoe Island, Miller's Island, Brownell Island, Maw's Island, Green Island, Dry Island)|
Restoule Lake is a lake found in the Almaguin Highlands region of the Parry Sound District in the province of Ontario, Canada. It is one of the larger lakes in the area and contains many islands. It was discovered by fur traders. The lake is named after native chief Joseph Restoule. The Grawbrager family were the first to settle there in 1840. Restoule Provincial Park is located on the north shore of the lake.