Grandfathers River is a River located in St. Mary's-The Capes, Newfoundland and Labrador.

• Latitude: 46° 58' 2'' North   (decimal: 46.9672222)
• Longitude: 53° 37' 30'' West   (decimal: -53.6250000)
• Topography Feature Category: River
• Geographical Feature: River
• Canadian Province/Territory: Newfoundland and Labrador
• Location: St. Mary's-The Capes
• Atlas of Canada Locator Map: Grandfathers River
• GPS Coordinate Locator Map: Grandfathers River Lat/Long