HMS Melampus was a 46-gun modified Leda-class fifth-rate frigate built for the Royal Navy during the 1810s. Completed in 1820, she was not commissioned until 1845 for the South America Station and was converted into a store and receiving ship in 1855. The ship was briefly assigned as a coast guard ship before being paid off in 1858. Melampus was converted into a Roman Catholic chapel ship in 1866 and then became a store ship twenty years later. The ship was sold for scrap in 1906.