French ship Jean-Jacques Rousseau (1795)

Jean-Jacques Rousseau was a 74-gun ship of the line of the French Navy.

In October 1796, under Captain Racord, she was part of the Villeneuve's squadron that sailed from Toulon to Brest. On 2 December 1802, she was renamed to Marengo (reflecting the political change from the Revolutionary Republic inspired by Jean-Jacques Rousseau to the advent of General (soon to be Emperor) Napoleon).

In 1803 she sailed to the Indian Ocean as Linois' flagship, notably taking part in the Battle of Pulo Aura and the Battle of Vizagapatam.

At the Action of 13 March 1806 Linois met with the division of Vice-Admiral Sir John Warren, with seven ships of the line (including the 108-gun HMS London (1766), the 82-gun HMS Ramillies (1785) and HMS Repulse (1803), and the 80-gun HMS Foudroyant (1798)), two frigates (including the 48-gun HMS Amazon (1799)) and one corvette. After a fierce duel with London, Marengo struck her colours; FRENCH SHIP Belle Poule battled against Amazon and later against Ramilles, and had to surrender as well.

Marengo was taken into British service as HMS Marengo. She was used as a prison hulk from 1809 until she was broken up in 1816.