O'Brien Bay is a Bay located in Renfrew, Ontario and has an elevation of 102 meters.

• Latitude: 45° 51' 34'' North   (decimal: 45.8594444)
• Longitude: 76° 54' 11'' West   (decimal: -76.9030555)
• Topography Feature Category: Bay
• Geographical Feature: Bay
• Canadian Province/Territory: Ontario
• Elevation: 102 meters
• Location: Renfrew
• Atlas of Canada Locator Map: O'Brien Bay
• GPS Coordinate Locator Map: O'Brien Bay Lat/Long