The Chaos de Montpellier-le-Vieux is a 120-hectare (297-acre) blockfield at the southern edge of the Causse Noir, above the Gorges de la Dourbie, north-east of Millau and its famous viaduct, in the commune of La Roque-Sainte-Marguerite, Aveyron, France.

The rocks consist of dolomite.

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  View from le Douminial
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  Arc de triomphe du chaos de Montpellier-le-Vieux
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  Le Douminial, highest point of the blockfield, on the right