Lac Théo is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 49° 26' 14'' North   (decimal: 49.4372222)
• Longitude: 79° 7' 52'' West   (decimal: -79.1311110)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Théo
• GPS Coordinate Locator Map: Lac Théo Lat/Long