The Lively class were a successful class of sixteen British Royal Navy 38-gun sailing frigates.

HMS Lively was a 38-gun fifth rate frigate of the Royal Navy, launched on 23 July 1804 at Woolwich Dockyard, and commissioned later that month. She was the prototype of the Lively class of 18-pounder frigates, designed by the Surveyor of the Navy, Sir William Rule. It was probably the most successful British frigate design of the Napoleonic Wars, to which fifteen more sister ships would be ordered between 1803 and 1812.