HMS James Watt
 HMS James Watt was a 91-gun steam and sail-powered second rate ship of the line. She had originally been ordered as one of a two ship class with her sister HMS Cressy under the name HMS Audacious. She was renamed on 18 November 1847 in honour of James Watt the inventor of the steam engine. She was the only Royal Navy ship to bear this name. Both ships were reordered as screw propelled ships James Watt in 1849 and Cressy in 1852.