Lac Rideau is a Lake located in Lac-Nilgaut; Pontiac, Quebec.

• Latitude: 46° 59' 26'' North   (decimal: 46.9905556)
• Longitude: 77° 17' 11'' West   (decimal: -77.2863889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Rideau
• GPS Coordinate Locator Map: Lac Rideau Lat/Long