The Douvenant Viaduct (viaduc de Douvenant) is a circular railway viaduct built between 1903 and 1905 for the Chemin de Fer des Côtes-du-Nord, between the French communes of Saint-Brieuc and Langueux.

It was designed by Louis Auguste Harel de La Noë and is the grandest in a series of thirteen "grognet" type viaducts.

The Association des Chemins de Fer des Côtes-du-Nord is constructing a heritage railway line that will use the viaduct.

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