The Royal Navy was the navy of Great Britain.
The Royal Navy possessed Dreadnought warships. (PROSE: Just War) These were developed in 1906 and launched in February of that year. They were used at sea during the First World War. (AUDIO: Peace in Our Time)
In the 20th century, the Master stole electronic spares from HMS Seaspite, disguising himself as a naval officer, in order to create a device to make contact with the Sea Devils. Later, the Royal Navy was ordered by Private Secretary Walker to attack the hostile Sea Devil base. The Sea Devils captured the HMS Seaspite, but additional naval reinforcements called in by Captain Hart took it back. (TV: The Sea Devils)
In March 2006, Mickey Smith hacked into the Royal Navy through the internet with the Ninth Doctor's help to launch harpoon missile UGM-84A from HMS Taurean at 10 Downing Street, defeating the Slitheen. (TV: World War Three)
Members of the Navy included Admiral Charles Fisher, (AUDIO: Eye of the Storm) Radar Plot Third Class Ben Jackson, (TV: The War Machines) Surgeon-Lieutenant Harry Sullivan, (TV: Robot) Captain John Hart, 3rd Officer Jane Blythe, Commander Ridgeway, Lt. Commander Mitchell, (TV: The Sea Devils) Captain Fenton, (PROSE: The Thing from Outer Space) Commander Millington, Bates (TV: The Curse of Fenric) and Stapleton Petherbridge. (AUDIO: The Wrong Doctors)