The Cians is a mountain river that flows through the Alpes-Maritimes department of southeastern France. It is long. Its drainage basin is . Its source is in the mountains north of Beuil, and it flows into the Var in Touët-sur-Var.
The Cians flows through the following communes:
This river runs through a canyon of red shale, named "Gorges du Cians", with formations of eroded rock.