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

• Latitude: 46° 51' 51'' North   (decimal: 46.8641667)
• Longitude: 77° 45' 23'' West   (decimal: -77.7563889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Diane
• GPS Coordinate Locator Map: Lac Diane Lat/Long