Six ships of the Royal Navy have borne the name HMS Cossack, after the Cossack people of Eastern Europe, whilst another was begun but was cancelled while building: was a 22-gun sixth-rate post-ship, begun under the name Pandour in 1805, but renamed before being launched in 1806. She was broken up in 1816. HMS Cossack was to have been a steam gunvessel, laid down at Portsmouth Dockyard in 1846, but cancelled in May 1849. was ordered as the Russian ship Witjas, a wood screw corvette building on the Thames at Northfleet, but the British government seized her while she was under construction in 1854; she was sold in 1875. was an launched in 1886 and sold in 1905. was a destroyer launched in 1907 and sold in 1919. was a destroyer launched in 1937 and sunk four days after being torpedoed by the in 1941, when attempts to tow her to safety failed. was a destroyer launched in 1944 and broken up in 1961. See also Royal Navy ship names