Vailly-sur-Aisne () is a commune in the Aisne department in Hauts-de-France in northern France.
The Commonwealth War Graves Commission maintains a cemetery, Vailly British Cemetery, at Vailly-sur-Aisne.
The town, derives its name from the Aisne, which flows just south of downtown. It is located around 13 kilometers from Soissons and 100 kilometers from Paris.