HMS Marmion was a Admiralty M-class destroyer which served with the Royal Navy during World War I. The M class were an improvement on the previous L class, capable of higher speed. Launched in May 1915, the ship served as part of the Grand Fleet on exercises and escort duty. For much of the war, it was commanded by William Leveson-Gower, the future uncle to Elizabeth II. While involved in convoy escort duty off the Shetland Islands on 21 October 1917, the vessel was accidentally struck by Tirade in bad weather and sank. There were no survivors.