Theodosia Arm is a Unincorporated area located in New Westminster Land District, British Columbia.

• Latitude: 50° 4' North   (decimal: 50.0666999)
• Longitude: 124° 42' West   (decimal: -124.6999999)
• Topography Feature Category: Unincorporated area
• Geographical Feature: Locality
• Canadian Province/Territory: British Columbia
• Location: New Westminster Land District
• Atlas of Canada Locator Map: Theodosia Arm
• GPS Coordinate Locator Map: Theodosia Arm Lat/Long