|Builder:||Vickers Armstrong, Barrow|
|Laid down:||24 March 1938|
|Launched:||5 May 1939|
|Commissioned:||31 October 1939|
|Identification:||Pennant number: N68|
|Fate:||Sold for breaking up, wrecked under tow December 1946|
|Class & type:||T-class submarine|
|Displacement:||1,090 tons surfaced
1,575 tons submerged
|Length:||275 ft (84 m)|
|Beam:||26 ft 6 in (8.08 m)|
|Draught:||16.3 ft (5.0 m)|
15.25 knots (28.7 km/h) surfaced
|Range:||4,500 nautical miles at 11 knots (8,330 km at 20 km/h) surfaced|
|Test depth:||300 ft (91 m) max|
Truant had a relatively active career serving in the main naval theatres of war - Home waters, the Mediterranean and the Pacific Far East.
Truant 's first major victory came when she torpedoed and damaged the German light cruiser Karlsruhe off Kristiansand, Norway, which disabled both engines and power stations. Karlsruhe had to be scuttled with two torpedoes by the German torpedo boat Greif. Truant later attacked the British merchant Alster, unaware that it had been recently captured from the Germans, but her torpedoes missed. She also intercepted the German merchant Tropic Sea. Tropic Sea had formerly been in Norwegian service, but had been captured by the German armed merchant cruiser Orion in the South Pacific. The Tropic Sea was scuttled by the German prize crew in the Bay of Biscay.
Assigned to the Mediterranean in mid 1940, Truant went on to sink a number of enemy ships, including the Italian merchant vessels Providenza, Sebastiano Bianchi and Multedo, the Italian tankers Bonzo and Meteor, the Italian auxiliary submarine chaser Vanna, the Italian passenger/cargo ship Bengasi and the German merchantman Virginia S. Truant also damaged the small Italian tanker Prometeo and the Italian torpedo boat Alcione, which was later declared a total loss. She also unsuccessfully attacked the Italian merchant vessels Utilitas, Silvia Tripcovich, Bainsizza and Arborea, the small Italian tanker Labor and the German merchantman Bellona.
Truant was assigned to operate in the Far East, against Japanese shipping in 1942. She torpedoed and sank the Japanese merchant cargo ships Yae Maru and Shunsei Maru and the Japanese army cargo ship Tamon Maru No.1. She also attacked the Japanese light cruiser Nagara, but the torpedoes missed their target. She was also prominent at the Battle of Badung Strait.
Truant survived the war and was sold to be broken up for scrap on 19 December 1945. She was wrecked in December 1946 whilst en route to the shipbreakers.
- Innes McCartney (2002). Lost Patrols: Submarine Wrecks of the English Channel.
- HMS Truant, Uboot.net
- Colledge, J. J.; Warlow, Ben (2006) . Ships of the Royal Navy: The Complete Record of all Fighting Ships of the Royal Navy (Rev. ed.). London: Chatham Publishing. ISBN 978-1-86176-281-8. OCLC 67375475.
- Hutchinson, Robert (2001). Jane's Submarines: War Beneath the Waves from 1776 to the Present Day. London: HarperCollins. ISBN 978-0-00-710558-8. OCLC 53783010.