Grassy Island is a Island located in Mackenzie, Northwest Territories.

• Latitude: 63° 46' 1'' North   (decimal: 63.7669699)
• Longitude: 104° 22' 3'' West   (decimal: -104.3673937)
• Topography Feature Category: Island
• Geographical Feature: Island
• Canadian Province/Territory: Northwest Territories
• Location: Mackenzie
• Atlas of Canada Locator Map: Grassy Island
• GPS Coordinate Locator Map: Grassy Island Lat/Long