HMS Naiad was a Royal Navy fifth-rate frigate that served in the Napoleonic Wars. She was built by Hall and Co. at Limehouse on the Thames, launched in 1797, and commissioned in 1798. She served in the French Revolutionary and Napoleonic Wars, and her last actions occurred in 1824–5. She was paid off in 1826. She then served for many years in Latin America as a coal depot, first for the Royal Navy and then for the Pacific Steam Navigation Company. She was broken up in 1898, 101 years after her launching.

HMS Ethalion was a 38-gun Artois-class fifth-rate frigate of the Royal Navy. She was built by Joseph Graham of Harwich and launched on 14 March 1797. In her brief career before she was wrecked in 1799 on the French coast, she participated in a major battle and in the capture of two privateers and a rich prize.