Oulchy-le-Château is a commune in the Aisne department in Hauts-de-France in northern France.

The town is located about 106 km (66 mi) from Paris, between Soissons to the north and Château-Thierry to the south. It is directly accessible by highway.

• Cugny-lès-Crouttes, located to the east

On the night of 2/3 March 1814, the area was taken by imperial troops commanded by Captain Parquin. In 1976, the commune of Cugny-lès-Crouttes was absorbed.

Historical population

Year	Pop.	±%
1962	679	—
1968	721	+6.2%
1975	759	+5.3%
1982	788	+3.8%
1990	856	+8.6%
1999	849	−0.8%
2008	848	−0.1%

• War memorial, on which 41 names are inscribed
• War memorial of Cugny-lès-Crouttes, on which 5 names are inscribed
• Monument in memory of Captain Parquin
• Many public baths
• The Ghosts of Landowski - 1919-1935 by Paul Landowski. This group consists of 7 stone soldiers, 8 meters (26 ft) high, each reflecting a weapon and erected on Chalmont hill at the site of the Second battle of the Marne.

• Gérard Titus-Carmel, painter and poet, lived and worked in the commune for more than thirty years

The village contains a bakery, supermarket, butcher shops, pharmacy, doctor, nightclub, police, garage and gasoline. The town contains a football stadium and two tennis courts.

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