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| Her Majesty's Naval Base Portsmouth | |
|---|---|
| Name | Her Majesty's Naval Base Portsmouth |
| Location | Portsmouth, Hampshire, England |
| Coordinates | 50.7993°N 1.1070°W |
| Operator | Royal Navy |
| Controlledby | Ministry of Defence (United Kingdom) |
| Used | 1194–present |
| Battles | Second World War, Battle of Britain, Napoleonic Wars |
Her Majesty's Naval Base Portsmouth Her Majesty's Naval Base Portsmouth is a principal Royal Navy facility on the south coast of England, forming one of the United Kingdom's principal deep-water naval bases alongside HMNB Devonport and HMNB Clyde. The base has hosted flagship vessels, historic dockyards and shore establishments associated with figures such as Horatio Nelson, institutions like the Admiralty (Royal Navy), and events including the Dunkirk evacuation and the D-Day landings. Its waterfront fronts the Portsmouth Harbour and adjoins the historic Old Portsmouth district, the Spinnaker Tower and the Isle of Wight approaches.
Portsmouth Dockyard traces origins to the medieval reign of King Henry II and was significantly expanded under King Charles II and King William IV during periods that included the Anglo-Dutch Wars and the Napoleonic Wars. The dockyard and base played central roles for admirals such as Horatio Nelson and John Jervis, 1st Earl of St Vincent during the age of sail; later industrialisation linked the site with firms like John Penn and Sons and the Royal Dockyards. In the 19th century the Industrial Revolution and innovations by inventors such as Isambard Kingdom Brunel and engineers tied Portsmouth into networks including the Great Western Railway and the London and South Western Railway. During the First World War and the Second World War the base supported fleets involved in the Battle of Jutland, the Battle of the Atlantic and the Normandy landings, while surviving aerial bombardment during the Blitz. Postwar reorganisation under the Defence Review frameworks and the creation of the Ministry of Defence (United Kingdom) reshaped functions, accommodating modern classes like the Type 45 destroyer and later Queen Elizabeth-class aircraft carrier.
The base encompasses historic dry docks, modern floating dock facilities, alongside specialized berths such as Admiral's Jetty and the Camber Dock. Important shore establishments include HM Naval Base Portsmouth (shore establishment), training units linked to Royal Naval Reserve elements, and administrative centres connected with the Navy Command. Heritage assets within the complex include the Mary Rose Museum exhibits, the HMS Victory preservation site linked to the National Museum of the Royal Navy, and conservation projects run with partners like Historic England and the National Historic Ships UK. Transport links integrate with Portsmouth Harbour railway station, the A3(M), and ferry services to Rodney Jetty and the Isle of Wight via operators such as Red Funnel and Wightlink.
Operational command coordinates Fleet Headquarters tasking, basing frontline units drawn from the Surface Fleet and auxiliaries such as RFA Fort Victoria-type vessels. Home units have included HMS Queen Elizabeth (R08), HMS Prince of Wales (R09), and legacy ships including HMS Ark Royal (R07) during its service life. Support elements comprise Royal Marines detachments, Fleet Air Arm liaison, and logistics groups connected to Defence Equipment and Support. The base also hosts ceremonial and visitor-facing units associated with The Queen's Harbour Master, Portsmouth and state occasions involving the Monarchy of the United Kingdom.
Naval aviation operations linked to Portsmouth interface with HMS Seahawk and the Royal Naval Air Station Yeovilton network, supporting rotary assets like the AgustaWestland Merlin HM2 and the Wildcat HMA2. Historic aviation connections include linkages to Battle of Britain aircrew movements and to aircraft carriers such as HMS Ark Royal (91) and HMS Illustrious (R06). Carrier integration exercises bring squadrons from Fleet Air Arm units and collaborate with allied air arms including Royal Air Force squadrons, United States Navy carrier strike groups and NATO partners during deployments such as Operation Shader deployments.
Portsmouth's dockyard complex specialises in refit, repair and preservation work executed by public–private partnerships involving Babcock International and subcontractors with historic ties to Vickers-Armstrongs. Dry dock infrastructure historically included the No. 1 Dry Dock and No. 2 Dock with modernisation programmes enabling maintenance for capital ships such as Queen Elizabeth-class aircraft carrier. Conservation and restoration of vessels like HMS Victory and the Mary Rose involve museum bodies including the National Museum of the Royal Navy and contractors accredited by Historic England. The base has hosted steelwork, marine engineering and systems integration projects supporting classes such as Type 23 frigate and Type 45 destroyer.
Portsmouth security functions coordinate with Ministry of Defence Police, Royal Navy Police and UK Border Force elements for force protection, anti-terror measures and maritime security operations. Training is delivered through establishments linked to Britannia Royal Naval College at Dartmouth, shore schools for seamanship and leadership, and specialist instruction provided by units associated with Defence Academy of the United Kingdom and Defence Training Estate. Exercises draw on wider NATO training programmes, inter-service drills with the British Army and Royal Air Force, and multinational events such as Exercise Joint Warrior.
The base is a major employer in Portsmouth and the wider Hampshire labour market, interlinked with supply chains including defence contractors like BAE Systems, Rolls-Royce marine divisions and local SMEs. Civic and cultural relationships involve Portsmouth City Council, heritage tourism centred on the Historic Dockyard, and events such as naval open days and the International Festival of the Sea. Economic impacts extend to housing, skills development with institutions such as the University of Portsmouth, and regeneration projects coordinated with agencies like Homes England and regional development bodies.