Montigny-Lengrain (French pronunciation: [mɔ̃tiɲi lɑ̃ɡʁɛ̃]) is a commune in the Aisne department in Hauts-de-France in northern France.

Historical population

Year	Pop.	±%
1962	649	—
1968	617	−4.9%
1975	584	−5.3%
1982	574	−1.7%
1990	585	+1.9%
1999	635	+8.5%
2008	663	+4.4%

On Easter day 945, the castle of Montigny-Lengrain, guarded by the faithful of King Louis IV of France, was taken by Herbert III of Vermandois, assisted by the Count of Tours and Blois Thibaud. The latter, vassal of Hugues the Great, participates in it as indirect support of Hugues to the fight against the king. (Y Sassier, Hugues Capet, Paris, Fayard, 2008, p115.)

• Church of Saint-Martin de Montigny-Lengrain, historical monument since 1921.
• The Renaissance cross within the walls of the church, become with the church historical monument
• The monument to the dead.
• Road crosses.

• 
  Église Saint-Martin
• 
  portail de l'ancien cimetière
• 
  Croix Renaissance, MH
• 
  Monument aux morts
• 
  Un croix de chemin

• Communes of the Aisne department