Krupanj (Serbian Cyrillic: Крупањ, pronounced [krûːpaɲ]) is a town and municipality located in the Mačva District of Serbia. The municipality has a total population of 17,398, while the town has a population of 4,455 (2011 census).
The town lies in western Serbia, at the southern border of the Pannonian plain and Mačva region. It is surrounded by the mountains Jagodnja, Boranja and Sokolska planina, in a picturesque valley intersected by numerous rivers and creeks. In the town itself, the rivers Bogoštica, Čađavica and Kržava conjoin into Likodra, which later empties into Jadar. The town lies at the altitude of 280 m.
The municipality area covers around 242 km2 (93.44 sq mi), and it encompasses 23 villages. It is the center of the region Rađevina, which was named after Rađ, a great knight of Prince Lazar, who defended it from Hungarian and Ottoman conquerors, and who is buried at the monument of Rađev Kamen.
Aside from the town of Krupanj, the municipality includes the following settlements: