Cosne-Cours-sur-Loire () is a commune and a subprefecture of the Nièvre department in central France. It was created in 1973 by the merger of two former communes: Cosne-sur-Loire and Cours.
Cosne-Cours-sur-Loire lies on the right bank of the Loire at its confluence with the Nohain, about 50 km northwest of Nevers. Cosne-sur-Loire station has rail connections to Nevers, Montargis and Paris. The A77 autoroute (MontargisâÂÂNevers) passes east of the town.
Cosne is mentioned in the 3rd-century Antonine Itinerary under the name of Condate, but it was not until the Middle Ages that it rose into importance as a military post. In the 12th century the bishop of Auxerre and the Count of Nevers agreed to a division of the supremacy over the town and its territory.
Population data refer to the commune in its geography as of January 2025.
The church of St Aignan is a building of the 12th century, restored in the 16th and 18th centuries. The only portions in the Romanesque style are the apse and the north-west portal. It formerly belonged to a Benedictine priory depending on the abbey of La Charité.
Cosne-Cours-sur-Loire is twinned with: