Lac O'Gallagher is a Lake located in Otter Lake; Pontiac, Quebec.

• Latitude: 45° 55' 10'' North   (decimal: 45.9194444)
• Longitude: 76° 36' 37'' West   (decimal: -76.6102778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Otter Lake; Pontiac
• GPS Coordinate Locator Map: Lac O'Gallagher Lat/Long