Overlea is an unincorporated community and census-designated place in Baltimore County, Maryland, United States. The population was 12,275 at the 2010 census. Students attend Overlea High School. Area roads include Belair Road and Kenwood Avenue.

U.S. Route 1 (US 1) is the easternmost and longest of the major north–south routes of the older 1920s era United States Numbered Highway System, running from Key West, Florida, to Fort Kent, Maine. In the U.S. state of Maryland, it runs 81 miles (130 km) from the Washington, D.C. line to the Pennsylvania state line near the town of Rising Sun.