Sion-sur-l'Océan (French pronunciation: [sjɔ̃ syʁ lɔseɑ̃], literally Sion on the Ocean) is a village and seaside resort in the Vendée department in western France.

The main beach is made of fine sand and stretches over 10 km (continuing by the "plages des demoiselles " in Saint Jean de Monts).

The area of the village is in full redesign with the development of a major infrastructure project on the scale of the town: thalassotherapy.

In 1871, Jean-Marie Baranger (a seafarer from the Hamlet Orouet) takes possession of the piece of land on the coast, which today includes the center and its shops.

Later, he will give up to the city space to build roads (rue de l'Yser, promenade and Sea Street Estivants).

150 years later, it is still his great-grandchildren who take certain businesses from the town (Hotel of Tourists, grocery store, restaurant le carré, hairdressing Baranger).