HMS Spenser was a Thornycroft type flotilla leader of the British Royal Navy. She was built by J I Thornycroft from 1916 to 1917 as the lead ship of her class, launching in September 1917 and completing in December that year. Spenser served in the Harwich Force during the rest of the First World War and in the Baltic during the British intervention in the Russian Civil War in 1919. After service at home and in the Mediterranean, she went into reserve in 1925 and was sold for scrap in 1936.