Mathieu of Boulogne, or Matheolus, was a 13th-century French cleric and poet. He is the author of the Liber lamentationum Matheoluli (The Lamentations of Matheolus) (ca. 1295) a work arguing that marriage makes men's lives miserable. The book was translated from the original Latin into French by Jean Le Fèvre de Ressons [fr] at the end of the 14th century. The Book of the City of Ladies by Christine de Pizan was primarily written in response to the Lamentations.