HMNB Portsmouth is a Royal Navy operating base situated on the eastern shore of Portsmouth Harbour, north of the Solent and the Isle of Wight. The site has a long history as a major naval dockyard and remains a key military installation in the UK.
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HMNB Portsmouth, officially known as His Majesty’s Naval Base, Portsmouth, is one of three operating bases in the United Kingdom for the Royal Navy. It is part of the city of Portsmouth and is situated on the eastern shore of Portsmouth Harbour, north of the Solent and the Isle of Wight. Historically it was officially known as HM Dockyard, Portsmouth and functioned primarily as a state‑owned facility for building, repairing and maintaining warships. For a time it was the largest industrial site in the world. The base remains a central element of the city’s maritime heritage and continues to serve as a critical naval facility for the UK.