| Upper Rideau Lake | |
|---|---|
 Upper Rideau Lake seen from Westport Harbour | |
  Upper Rideau Lake | |
| Location | Ontario |
| Coordinates | 44°40′55″N 76°20′10″W / 44.682°N 76.336°W |
| Primary inflows | Westport Sand Lake |
| Primary outflows | Big Rideau Lake |
| Catchment area | 61 km2 (24 sq mi) |
| Basin countries | Canada |
| Max. depth | 23 m (75 ft) |
| Surface elevation | 124.65 m (409.0 ft) |
| Settlements | Village of Westport, Village of Newboro |
Upper Rideau Lake is a freshwater lake located in the municipality of Rideau Lakes, United Counties of Leeds and Grenville in Eastern Ontario, Canada. A part of the Saint Lawrence River drainage basin, the lake has the highest altitude of any body of water within the Rideau Canal system.