Montreuil Abbey, or Montreuil-les-Dames, was a Cistercian nunnery in the Diocese of Laon, France, located at first at Montreuil-en-Thiérache (commune of Rocquigny, department of Aisne) until the 17th century and afterwards in Laon, where it was known as Montreuil-sous-Laon.