The Royal Navy (RN) is the United Kingdom’s naval warfare force. Although warships were used by English and Scottish kings from the early medieval period, the first major maritime engagements were fought in the Hundred Years’ War against the Kingdom of France. The modern Royal Navy traces its origins to the early 16th century; the oldest of the UK’s armed services, it is known as the Senior Service.

From the middle decades of the 17th century, and through the 18th century, the Royal Navy vied with the Dutch Navy and later with the French Navy for maritime supremacy. From the mid 18th century, it was the world’s most powerful navy until the Second World War. The Royal Navy played a key part in establishing the British Empire as the unmatched world power during the 19th and first part of the 20th centuries. Due to this historical prominence, it is common, even among non-Britons, to refer to it as “the Royal Navy” without qualification.

Following World War I, the Royal Navy was significantly reduced in size, although at the onset of World War II it was still the world’s largest. During the Cold War, the Royal Navy transformed into a primarily anti-submarine force, hunting for Soviet submarines and mostly active in the GIUK gap. Following the collapse of the Soviet Union, its focus has returned to expeditionary operations around the world and it remains one of the world’s foremost blue-water navies. However, 21st-century reductions in naval spending have led to a personnel shortage and a reduction in the number of warships.

The Royal Navy maintains a fleet of technologically sophisticated ships, submarines, and aircraft, including two aircraft carriers, two amphibious transport docks, four ballistic missile submarines (which maintain the UK’s nuclear deterrent), seven nuclear fleet submarines, six guided missile destroyers, 13 frigates, 13 mine-countermeasure vessels and 23 patrol vessels. As of November 2020, there are 78 operational commissioned ships (including submarines as well as one historic ship, HMS Victory) in the Royal Navy, plus 13 ships of the Royal Fleet Auxiliary (RFA); there are also five Merchant Navy ships available to the RFA under a private finance initiative. The RFA replenishes Royal Navy warships at sea, and augments the Royal Navy’s amphibious warfare capabilities through its three Bay-class landing ship vessels. It also works as a force multiplier for the Royal Navy, often doing patrols that frigates used to do. The total displacement of the Royal Navy is approximately 443,200 tonnes (819,200 tonnes including the Royal Fleet Auxiliary).

The Royal Navy is part of Her Majesty’s Naval Service, which also includes the Royal Marines. The professional head of the Naval Service is the First Sea Lord who is an admiral and member of the Defence Council of the United Kingdom. The Defence Council delegates management of the Naval Service to the Admiralty Board, chaired by the Secretary of State for Defence. The Royal Navy operates from three bases in the United Kingdom where commissioned ships and submarines are based: Portsmouth, Clyde and Devonport, the last being the largest operational naval base in Western Europe, as well as two naval air stations, RNAS Yeovilton and RNAS Culdrose where maritime aircraft are based.