Lachy may refer to:
Lachy, Marne, a commune in the Marne department in north-eastern France Lachy or Lendians, an ancient Polish tribe Lachy Sądeckie, the Lachy culture of the Sądeckie region of Poland Lachy, Podlaskie Voivodeship, a village in north-eastern Poland
See also Lachlan (name), Lachy is a pet form of the name Lachlan