Calvert Hills Historic District is a national historic district in College Park, Prince George's County, Maryland. It is roughly bounded on the north by Calvert Road, on the east by the Green Line metrorail corridor (the former Baltimore and Ohio Railroad right-of-way), on the south by the northern boundary of Riverdale Park, and on the west by Baltimore Avenue (US Route 1). It does not include Calvert Park on the southeast corner. Primarily a middle-class single-family residential neighborhood, it also includes some apartment houses as well as the College Park Post Office, a contributing property at 4815 Calvert Road.