Portsmouth Olde Towne Historic District, is a national historic district located at Portsmouth, Virginia. It encompasses 89 buildings. It is located in the primarily residential section of Portsmouth and includes a notable collection of Federal and Greek Revival style townhouses, known as "basement houses." Other notable buildings include the Watts House, Grice-Neeley House, Ball-Nivison House, Emanuel African Methodist Episcopal Church, St. John's Episcopal Church, Court Street Baptist Church, and Union Machinist Home.