Berrias-et-Casteljau (French pronunciation: [bɛʁjas e kastɛlʒo]; Occitan: Berriàs e Castèljau) is a commune in the Ardèche department in southern France.

The Chassezac flows southeast through the northern part of the commune, then forms part of its eastern border.

The Berriasian Age of the Cretaceous Period of geological time is named for the village of Berrias in the commune.

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