Pontchâteau (French pronunciation: [pɔ̃ʃato] ⓘ; Breton: Pontkastell-Keren) is a commune in the Loire-Atlantique department in western France.

Pontchâteau is located at a major crossroads, at the junction of the RN 165, the Nantes-Vannes-Brest expressway, and the D 773, the Saint-Nazaire-Redon road.

Pontchâteau also lies on the Savenay–Landerneau railway line, and is served by a station.

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