Nancy-sur-Cluses (French pronunciation: [nɑ̃si syʁ klyz], literally Nancy on Cluses; Savoyard: Nanfi) is a commune in the Haute-Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France. In 2022 Nancy-sur-Cluses counted 466 inhabitants.

Romme-sur-Cluses is a 1,292 m (4,239 ft) high resort located at 10 km (6.2 mi) from Cluses. Nancy-sur-Cluses provides also a large choice of familiar hikes around the Aravis massif of mountains.