Rosnay may refer to the following places in France:
Rosnay, Indre, a commune in the Indre department Rosnay, Marne, a commune in the Marne department Rosnay, Vendée, a commune in the Vendée department Rosnay-l'Hôpital, a commune in the Aube department
Family name Joël de Rosnay Tatiana de Rosnay, French writer Xavier de Rosnay, French electro-house musician, see Justice (French band)