HMS "Tonnant () was an 80-gun ship of the line of the Royal Navy. She had previously been Tonnant" of the French Navy and the lead ship of the . The British captured her in August 1793 during the Siege of Toulon but the French recaptured her when the siege was broken in December. Rear-Admiral Horatio Nelson captured her at Aboukir Bay off the coast of Egypt at the Battle of the Nile on 1 August 1798. She was taken into British service as HMS "Tonnant". She went on to fight at the Battle of Trafalgar in 1805, during the Napoleonic Wars.