Armand Louis de Gontaut (French pronunciation: ​[aʁmɑ̃ lwi də ɡɔ̃to]), duc de Lauzun, later duc de Biron, and usually referred to by historians of the French Revolution simply as Biron (13 April 1747 – 31 December 1793) was a French soldier and politician, known for the part he played in the American War of Independence and the French Revolutionary Wars. In 1773, he was Grand second warden of Grand Orient de France.