Portsmouth, England, a city in Hampshire, and Great Britain's chief naval base. The city, occupying Portsea Island and part of the mainland, is on the English Channel, 65 miles (105 km) southwest of London. Portsmouth is made up of four towns, consolidated in 1926: Landport, with residences for dock workers; Southsea, a fashionable residential and resort area; and Portsea and the old town of Portsmouth, the centers of naval activity. Shipbuilding and aircraft engineering are the chief industries. Portsea Island is linked to the mainland by road and railway bridges. Portsmouth's airport handles international flights.

Historic attractions include parts of the original 12th-century church of Saint Thomas of Canterbury, incorporated in the cathedral of Portsmouth; the Victory, Lord Nelson's flagship at the Battle of Trafalgar, 1805; and Charles Dickens's home, now a museum. Portsmouth was one of the starting points for the Allies' D-Day invasion of France in 1944.

Population (district): 186,702.