Ambleny (French pronunciation: [ɑ̃bləni]) is a commune in the department of Aisne in the Hauts-de-France region of northern France.

Route National N31 passes through the northern part of the commune between those two cities with an exit to the D943 road which runs south to the town.

[3] The Ru de Retz waterway forms part of the south-western boundary of the commune before flowing north through the town and continuing to the river Aisne just north of the commune as it flows west to join the Oise at Compiègne.

The Quenneton stream joins the Ru de Retz south of the town at the commune boundary from the west.

[3] [3] The former hamlets of Fosse-en-Haut and Fosse-en-Bas served as the starting point for several French units (including the 418th Infantry Regimanet) during the Second Battle of the Marne on 18 July 1918.