HMS Lassoo was a Laforey-class destroyer of the Royal Navy. She was built during the First World War as part of an emergency program of naval construction, to an Admiralty design by William Beardmore & Company, Dalmuir. She was originally to have been named HMS Magic but she was renamed HMS Lassoo on 15 February 1915 before being launched on 24 August 1915. She was sunk by the German U-boat SM UB-10 on 13 August 1916 off the Maas lightship in the North Sea.