Charlestown Heights, also known as the Doherty Playground or Doherty Park, is an urban park in Charlestown, a neighborhood of Boston, Massachusetts. It is one of five small urban parks designed by Frederick Law Olmsted for the city. These small parks were designed to provide small greenspaces in densely populated neighborhoods. The Doherty Playground was laid out on the north side of Bunker Hill, sloping down the hill from Bunker Hill Avenue to Medford Street, between St. Martin Street and North Mead Street. The park was listed on the National Register of Historic Places in 1998.