Lac à Thomas is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 49° 8' 54'' North   (decimal: 49.1483789)
• Longitude: 69° 3' 18'' West   (decimal: -69.0550520)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac à Thomas
• GPS Coordinate Locator Map: Lac à Thomas Lat/Long