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

• Latitude: 54° 47' 44'' North   (decimal: 54.7955556)
• Longitude: 71° 2' 47'' West   (decimal: -71.0463888)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Lajannière
• GPS Coordinate Locator Map: Lac Lajannière Lat/Long