Montmerle Charterhouse (French: Chartreuse Notre-Dame de Montmerle du Val-Saint-Étienne, Latin: Mons Merula) is a former charterhouse, or Carthusian monastery, located in Lescheroux, in the arrondissement of Bourg-en-Bresse and the canton of Saint-Trivier-de-Courtes, in the department of Ain, France.