Ange René Armand, Baron de Mackau (17 February 1788 – 13 May 1855) was a French naval officer and politician. In 1825, he led 14 brigs of war to Haiti in one of the earliest instances of gunboat diplomacy, forcing the recently emancipated people of Haiti to pay 150 million francs to their former enslavers. The Mackau Law that he later instigated as Minister of the Navy and of Colonies paved the way for the abolition of slavery.