HMS Cossack(F03/G03/L03) was a Tribal-class destroyer of the British Royal Navy. The ship was known for its role in the so-called Altmark incident.

The keel of the ship was on 9 June 1936 on the High Walker Yard of Vickers-Armstrongs in Newcastle-upon-Tyne, on 8 June 1937, followed by the launching on 7 Commissioned in June 1938, and the 14 1938.

On 16 February 1940, it boarded one of the prize crew commanded by Philip S. Vian, the German supply ship Altmark in Norwegian Jøssingfjord. It freed 303 prisoners trading sailors whose ships had been applied by Admiral Graf Spee in the South Atlantic. While seven of the Altmark crew were shot.

A few weeks later, on 13 April 1940, it belonged to the British HMS Cossack Association; under the leadership of the battleship HMS Warspite, penetrated the Ofotfjord up to Narvik and then in the second naval battle of Narvik, the remaining eight German destroyers sunk or forced to scuttle.

After that, the destroyer in the North Atlantic was primarily used for the detection of suspected German Seehandelsstörer. In May 1941, as part of the bodyguard of the convoy WS-8B, the ship belonged to the forces to locate the German battleship Bismarck and should pocket.

Five destroyers, including HMS Cossack, were on 26 May be deducted from the convoy to drive during the night torpedo attack on the Bismarck. These attacks were unsuccessful; however, forced the crew of the German battleship that night to stay in full combat readiness. After the sinking of the Bismarck, the next day, the staff of the destroyer of the legend took over after the cat aboard the Bismarck.

On 24 October 1941, the ship was accompanying a convoy from Gibraltar, severely damaged by a torpedo from U 563rd tug tried on 25 October to tow the boat back to Gibraltar. Still, the line had in increasingly bad weather the next day will be capped. The destroyer sank on 27 West of Gibraltar in October 1941 with 159 members of the crew.