Joncourt is a commune located in the Aisne department in the Hauts-de-France region of northern France.
Geographically, Joncourt is situated approximately 10 kilometers (6 miles) north of Saint-Quentin. It is part of the historical region of Picardy and lies within the arrondissement of Saint-Quentin and the canton of Bohain-en-Vermandois. The village itself is typically characterized by its rural setting, with an economy primarily based on agriculture.
Historically, Joncourt holds significance due to its proximity to major front lines during World War I. The area around Joncourt was part of the Hindenburg Line (Siegfriedstellung), a vast defensive system constructed by the German forces. The village and its surroundings saw intense fighting, particularly during the Allied offensives in 1917 and 1918, including the Battle of Joncourt (September 1918) which was part of the wider Battle of Cambrai–Saint-Quentin. As a result, the village suffered extensive damage during the conflict. Like many communes in the region, Joncourt has various war memorials and cemeteries, including the Joncourt Communal Cemetery Extension, which contains the graves of Commonwealth soldiers.