Indomptable ("Indomitable") was a Tonnant-class 80-gun ship of the line in the French Navy, laid down in 1788 and in active service from 1791. Engaged against the Royal Navy after 1794, she was damaged in the Battle of Trafalgar and wrecked near the Spanish city of Cadiz on 25/26 October 1805.

The Tonnant class was a series of eight 80-gun ships of the line designed in 1787 by Jacques-Noël Sané, whose plans for the prototype were approved on 29 September 1787. With sixteen gunports on the lower deck on each side these were the most effective two-deckers of their era. Their broadside of 1,102 livres equated to 1,190 British pounds weight, over 50% more than the standard British 74-gun ship, and even greater than that of a British 100-gun three-decker.