Ain (river)
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![Salins-les-Bains in the glaciated landscape of the upper Ain.](/Images/godic/202412/20/Salins_les_Bains_24226.JPG")
![Source of the Ain](/Images/godic/202412/20/Ain_source4226.jpg")
![The Jura ridges. A view from Colomby de Gex on the highest of them, across the progressively lower ones to the Ain valley in the middle distance, 26 km (16 mi) away. The Pays de Bresse is beyond the furthest ridge. The people are looking towards the Lac de Vouglans. Geneva, at the southern end of the Swiss plateau, is below and behind us.](/Images/godic/202412/20/Jura_6_by_andy2054226.jpg")
- This article is for the river in France. For the river in the Haida Gwaii archipelago in Canada, see Ain River (Haida Gwaii)
The Ain (French: [ɛ̃]) is a river in eastern France. It gave its name to the Ain departements. In the Franco-Provençal language it is known as the En.