HMS Cassandra was a C-classdestroyer of the Royal Navy, ordered in February 1942 from Yarrow Shipbuilders. She was originally to be named HMS Tourmaline but this was changed to Cassandra in November 1942 to fit her revised class name. She was laid down on 30 January 1943 and launched on 29 November 1943.
After the war, Cassandra 's repairs were completed and she was placed in reserve in 1946. She then served in the Mediterranean Sea and Indian Ocean. Cassandra was modernised by Yarrow and Company. This involved her being fitted with an enclosed bridge and Squid anti-submarine mortars. One set of torpedo tubes and 'X' gun turret were removed at this time. She re-entered service in April 1960 and was allocated for service in the Far East as part of the 8th Destroyer Squadron. She covered 50,00 miles during a commission in 1962-3 which took her from the Far East and returning to Portsmouth. In February 1963 the ship became part of the 21st Destroyer Squadron in the Mediterranean. In 1964 and 1965 she served in the Mediterranean and the Far East, including service in the Indonesian Confrontation.