Ouroux-en-Morvan (; ; Burgundian: Orrou) or simply Ouroux is a rural commune in the Nièvre department in the Bourgogne-Franche-Comté region in central France. As of 2023, the population of the commune was 599.
Ouroux-en-Morvan covers an area of 60.56 km<sup>2</sup> (23.38 sq mi). It is part of Morvan Regional Natural Park.
Ouroux-en-Morvan played a central role in World War II in the Morvan. It was the headquarters of the French Resistance in Nièvre; as such it became the "clandestine prefecture" of Nièvre in the summer of 1944.
Ouroux-en-Morvan has been twinned with Cullera, Spain since 1979.