Château-d'Œx (French pronunciation: [ʃɑto dɛ]) is a municipality in the canton of Vaud in Switzerland. It is in the district of Riviera-Pays-d'Enhaut.

Château-d'Œx is first mentioned in 1115 as Oit, Oyz, Oix and Oyez.

During the late Paleolithic and Mesolithic (9500 BC to at least 6000 BC) caves around Château-d'Œx served as a seasonal settlement. Bronze Age knives indicate that there was a settlement during that era as well. Many of the local names (combe = valley, joeur = forest, man = rock) and the local dialect are the only traces of a Celtic settlement in the area.