The Rance (French pronunciation: [ʁɑ̃s] ⓘ; Breton: Renk, [ˈrẽŋk]) is a river of northwestern France.

Before reaching the Channel, its waters are barred by a 750 metre long dam forming the Rance tidal power plant.

Départements and towns along the river: Tributaries of the Rance include: This river has moderate turbidity and its brownish water is somewhat low in velocity due to the slight gradient of the watercourse; pH levels have been measured at 8.13[2] within the city of Dinan and electrical conductivity of the waters have tested at 33 micro-siemens per centimetre.

At this reference location, summer flows are typically in the range of 14 cubic metres per second (500 cu ft/s).

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