State Route 10 (abbreviated SR 10) is a part of Maine's system of numbered state highways, located in the extreme northern part of the state near the Canada–US border. It is a secondary highway which runs for 9.3 miles (15.0 km) between U.S. Route 1 (US 1) in Presque Isle and US 1A in Easton. Along with US 1A between Easton and Mars Hill, it comprises a former route of US 1. SR 10 is signed as an east-west highway but follows an odd staircase-shaped alignment.