Pornichet (French pronunciation: [pɔʁniʃɛ]; Breton: Pornizhan) is a commune in the Loire-Atlantique department in western France.

Pornichet is a coastal town of the Côte d'Amour, located ten kilometers west of the centre of Saint-Nazaire.

The dune behind the beach of the Libraires reaches 9 m. The cliffs of Bonne Source and Sainte-Marguerite can reach 12 m. Going inland, altitudes progressively increase up to 44 m. The highest point is located in the hamlet called Ville ès Blais.

Pornichet has three beaches: in the West, the Beach of the Libraires (plage des Libraires), of 2 km length, is part of the Bay of Pouliguen (baie du Pouliguen), shared with La Baule; the border is marked by the Mazy creek (currently underground).

[4] Situated on the shores of the Atlantic Ocean, the area that will become Pornichet developed in the middle of the 19th century with seaside tourism, as evidenced by its original villas, some of which have escaped the destruction caused by urbanization.