Lassy

Lassy is the name of three communes in France:
 Lassy, Calvados, in the Calvados department
 Lassy, Ille-et-Vilaine, in the Ille-et-Vilaine department
 Lassy, Val-d'Oise, in the Val-d'Oise department

 Other 
 Lassi (disambiguation)
 Lassie