Buire-le-Sec (French pronunciation: [bɥiʁ lə sɛk]; Picard: Buire-l'Sé) is a commune in the Pas-de-Calais department in the Hauts-de-France region in northern France.

[3] Buire-le-Sec is a village situated some 5 miles (8 km) southeast of Montreuil-sur-Mer on the D139 road.

The church is one of the most beautiful and oldest in the arrondissement of Montreuil.

It is in the form of a Latin cross and built from chalk.

The dimensions are: 32 meters long, including 19m for the nave and 7m for the choir.