| Pontchâteau | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Eon (Eudon) de Blain seigneur de Pontchâteau.svg |
| Arrondissement: | Saint-Nazaire |
| Canton: | Pontchâteau |
| Insee: | 44129 |
| Postal Code: | 44160 |
| Mayor: | Danielle Cornet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays de Pontchâteau St-Gildas-des-Bois |
| Coordinates: | 47.43°N -2.083°W |
| Elevation M: | 7 |
| Elevation Min M: | 0 |
| Elevation Max M: | 52 |
| Area Km2: | 55.79 |
Pontchâteau (in French pronounced as /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.