Allondon

Infobox_River
river_name = Allondon


image_size = 288px
caption =
origin =
mouth = Rhône
basin_countries = FRA SUI
length = 22.5km
elevation =
mouth_elevation =
discharge = 2,5 m³.s-1
watershed = pluvial

The Allondon is a river which flows for some 22km between France and Switzerland in the Rhône Alps area. Its source is located in the commune of Échenevex in the Ain department and ends in the river Rhône at the village of Russin in the canton of Geneva of Switzerland.