HMS Umbra (P35) was a Royal Navy U-class submarine built by Vickers-Armstrongs at Barrow-in-Furness. So far she has been the only ship of the Royal Navy to bear the name Umbra.
HMS Tradewind was a British submarine of the third group of the T class. She was built as P329 at Chatham, and launched on 11 December 1942. As of 2021 she is the only ship of the Royal Navy to have been named Tradewind, after the trade winds.
HMS Truculent was a British submarine of the third group of the T-class. She was built as P315 by Vickers Armstrong, Barrow, and launched on 12 September 1942. She sank nine enemy vessels.
HMS Trenchant (P331) was a British T class submarine of the Second World War built at Chatham Dockyard.
HMS Trident was a British T class submarine built by Cammell Laird, Birkenhead. She was laid down on 12 January 1937 and was commissioned on 1 October 1939. HMS Trident was part of the first group of T class submarines.
HMS Strongbow was an S-class submarine of the Royal Navy, and part of the Third Group built of that class. She was built by Scotts, of Greenock and launched on 30 August 1943.
HMS Statesman (P246) was an S-class submarine of the Royal Navy, and part of the Third Group built of that class. She was built by Cammell Laird and launched on 14 September 1943. So far she has been the only ship of the Royal Navy to bear the name Statesman.
HMS Porpoise (N14) was one of the six-ship class of Grampus-class mine-laying submarines of the Royal Navy. She was built at Vickers Armstrong, Barrow and launched 30 August 1932. She served in World War II in most of the naval theatres of the war, in home waters, the Mediterranean and the Far East. She was sunk with all hands by Japanese aircraft on 19 January 1945, and was the last Royal Navy submarine to be lost to enemy action.
HMS Truant (N68) was a T-class submarine of the Royal Navy. She was laid down by Vickers Armstrong, Barrow and launched on 5 May 1939.
HMS Trusty (N45) was a T-class submarine of the Royal Navy. She was laid down by Vickers Armstrong, Barrow and launched in March 1941.
HMS Thorough was a British submarine of the third group of the T class. She was built as P324 by Vickers Armstrong, Barrow, and launched on 30 October 1943. So far she has been the only ship of the Royal Navy to bear the name Thorough.
HMS Trespasser was a British submarine of the third group of the T class. She was built as P312 by Vickers Armstrong, Barrow, and launched on 29 May 1942. So far she has been the only ship of the Royal Navy to bear the name Trespasser.
HMS Tally-Ho was a British submarine of the third group of the T class. She was built as P317 by Vickers Armstrong, Barrow and launched on 23 December 1942. She has been the only ship of the Royal Navy to bear the name, that of the hunting call, "Tally-Ho!".
HMS Templar was a British submarine of the third group of the T class. She was built by Vickers Armstrong at Barrow-in-Furness, and launched on 26 October 1942 with the pennant number P316. So far she has been the only ship of the Royal Navy to bear the name Templar, probably after the crusading order, the Knights Templar.
HMS Tantivy was a British submarine of the third group of the T class. She was built as P319 by Vickers Armstrong, Barrow, and launched on 6 April 1943. So far she is the only ship of the Royal Navy to bear the name Tantivy.
HMS Terrapin was a British submarine of the third group of the T class. She was built as P323 by Vickers Armstrong, Barrow and launched on 31 August 1943. So far she has been the only ship of the Royal Navy to bear the name Terrapin, after the animal of that name. Apart from a brief period in home waters off the Scandinavian coast, Terrapin served in the Far East for much of her wartime career.
HNLMS Zwaardvisch (S814) was the lead ship of the Royal Netherlands Navy's Zwaardvisch-class submarine, which was based on the British T class. The submarine was originally ordered as HMS Talent (P322) and built by Vickers Armstrong, Barrow. It served mainly in the Pacific against the Japanese during the war, operating under both British and US operational command in Ceylon and Australia. In 1950, the vessel was renamed HNLMS Zwaardvis. She was sold and broken up for scrap in 1963.
HMS Taurus was a Second World War T-class submarine, built by Vickers Armstrong, Barrow.
HMS Ultor (P53) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness, launched in 1942, and part of the third group of the class. So far she has been the only ship of the Royal Navy to bear the name Ultor.
Vice-Admiral Sir Hugh Stirling Mackenzie, was a Royal Navy officer who became Flag Officer Submarines and Chief Polaris Executive.
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