Admiral Mark Edward Frederic Kerr, was a Royal Navy and Royal Air Force officer during the First World War. Kerr was the Commander-in-Chief of the Royal Hellenic Navy in the early part of the First World War, Commander-in-Chief of the British Adriatic Squadron in 1916 and 1917 and was involved in the work to create the Royal Air Force in late 1917 and early 1918.

HMS Mermaid was a Hawthorn Leslie three-funnel, 30 knot destroyer ordered by the Royal Navy under the 1896 – 1897 Naval Estimates. She was launched in 1898, served during World War I and was sold for breaking in 1919.