Portsmouth referere ofte til byen Portsmouth i Hampshire, England. Øvrige betydninger:
Stednavne Dominica Portsmouth, Dominica
Storbritannien Portsmouth, West Yorkshire
USA Portsmouth, Iowa Portsmouth, New Hampshire Portsmouth Naval Shipyard Portsmouth, North Carolina Portsmouth Island, North Carolina Portsmouth, Ohio Portsmouth, Portland, Oregon Portsmouth, Rhode Island Portsmouth, Virginia Portsmouth Township, Michigan Portsmouth Square i San Francisco
Sport Portsmouth F.C., engelsk fodboldklub Portsmouth Spartans, nuværende Detroit Lions
Se også Portsmouth-traktaten HMNB Portsmouth