Marengo was a 74-gun built for the French Navy during the first decade of the 19th century. Completed in 1811, she played a minor role in the Napoleonic Wars.
Designed by Jacques-Noël Sané, the Téméraire-class ships had a length of , a beam of and a depth of hold of . The ships displaced 3,069 tonneaux and had a mean draught of . They had a tonnage of 1,537 port tonneaux. Their crew numbered 705 officers and ratings during wartime. They were fitted with three masts and ship rigged.
The muzzle-loading, smoothbore armament of the Téméraire class consisted of twenty-eight 36-pounder long guns on the lower gun deck and thirty 18-pounder long guns on the upper gun deck. After about 1807, the armament on the quarterdeck and forecastle varied widely between ships with differing numbers of 8-pounder long guns and 36-pounder carronades. The total number of guns varied between sixteen and twenty-eight. The 36-pounder obusiers formerly mounted on the poop deck () in older ships were removed as obsolete.
Marengo was ordered on 11 August 1806 and named on 19 July. The ship was laid down on 19 September 1809 at the Arsenal de Lorient and launched on 12 October 1810. The ship was completed in April 1811 and commissioned on 25 April. On 5 January 1813, she collided with the off Brest. In November 1814, under René Lemarant de Kerdaniel, she took part in the French repossession of Guadeloupe and Martinique.
She took part in the Invasion of Algiers in 1830, and in the Battle of the Tagus under Captain Maillard Liscourt the next year. In 1854, she took part in the Crimean War. She was struck on 21 July 1858 and was used as a prison hulk from 1860 to 1865. In 1866, she was renamed Pluton.