HMS Glatton was a 56-gun fourth rate of the Royal Navy. Wells & Co. of Blackwell launched her on 29 November 1792 for the British East India Company (EIC) as the East Indiaman Glatton. The Royal Navy bought her in 1795 and converted her into a warship. Glatton was unusual in that for a time she was the only ship-of-the-line that the Royal Navy had armed exclusively with carronades. (Eventually she returned to a more conventional armament of guns and carronades.) She served in the North Sea and the Baltic, and as a transport for convicts to Australia. She then returned to naval service in the Mediterranean. After the end of the Napoleonic Wars the Admiralty converted her to a water depot at Sheerness. In 1830 the Admiralty converted Glatton to a breakwater and sank her at Harwich.