Châteauneuf-d'Entraunes (French: [ʃɑtonœf dɑ̃tʁon]; Occitan: Chasternòu d'Entraunas; Italian: Castelnuovo d'Entraunes) is a commune in the Alpes-Maritimes department in southeastern France. It is situated in the Val d'Entraunes, the upper valley of the river Var. It lies partly within the Mercantour National Park. The church of Saint-Nicolas houses a 16th-century altarpiece, attributed to François Bréa.