Coucy-le-Château-Auffrique (French pronunciation: [kusi l(ə) ʃɑto ofʁik]; Picard: Couchi-Catieu-Aufrike) is a commune in the Aisne department in Hauts-de-France in northern France.

Coucy is located west of Laon on the road between Tergnier (north) and Soissons (south) north-northeast of Paris.

The river Ailette forms most of the commune's southern border.

Historical population

Year	Pop.	±% p.a.
1968	1,137	—
1975	1,118	−0.24%
1982	1,120	+0.03%
1990	1,058	−0.71%
1999	995	−0.68%
2009	1,053	+0.57%
2014	1,041	−0.23%
2020	992	−0.80%
Source: INSEE

• Moses ben Jacob of Coucy
• Samson of Coucy
• Louis-Xavier Gargan [fr]
• César de Vendôme, (born 7 June 1594)
• Ferdinand Stanislas Bigot (6 May 1809 – 1890), mayor of Coucy-le-Château in the 1870s
• François Pipelet de Leury, (1722–1809), director of the Royal Academic Surgery, doctor of the royal family, mayor of Coucy-le-Château for thirty years. Lieutenant of the first surgeon for the king.
• Enguerrand VII de Coucy
• Barbin Pierre Philibert (1819-1868) born in Coucy-le-Chateau, grandfather of the actor Rudolph Valentino.

• Ruins of the Château de Coucy. The modern town is squeezed into the space within the medieval walls.
• A medieval garden
• Domaine de la Grangère (a green space for the garden of the governor's house at the time) - landmark classified in 1931
• A church - rebuilt after World War I.
• The forest nearby Coucy is the place where the Paris Gun was located and first used in WWI.

• Communes of the Aisne department
• List of medieval bridges in France

• Official website
• http://www.amvcc.com
• Tourist guide to the town
• Arms of this town
• Collection of old postcards from Coucy