Chézy-sur-Marne (French pronunciation: [ʃezi syʁ maʁn], literally Chézy on Marne) is a commune in the Aisne department in Hauts-de-France in northern France.

The town was hit by a flash flood and mudslide on 14 June 2009 after a violent localised storm.

Cars were floated downstream, cellars and ground-floor rooms in low-lying houses were flooded.

Adjacent localities were also affected.

This Château-Thierry arrondissement geographical article is a stub.