Lagny (disambiguation)
Lagny is the name or part of the name of the following French municipalities:
- Lagny in the Oise department
- Lagny-le-Sec in the Oise department
- Lagny-sur-Marne in the Seine-et-Marne department
See also: Lagny Abbey in Lagny-sur-Marne
Lagny is the family name of the following people:
- Thomas Fantet de Lagny (1660–1734), French mathematician
