HMS Sulphur was a 10-gun Hecla-class bomb vessel of the British Royal Navy, famous as one of the ships in which Edward Belcher explored the Pacific coast of the Americas.

The Hecla class was a class of bomb vessels of the Royal Navy of the early 19th century. They were designed for use as bomb or mortar ships and were very heavily built. Eight ships were launched; all were converted for use as exploration or survey ships. Four ships of the class are known for the role they played in Arctic and Antarctic exploration.