The Cerusa is a 10.7-kilometre (6.6 mi) stream of Liguria (Italy).

The river then flows through the Valle Cerusa and crosses the villages of Fiorino, Fabbriche di Voltri e Fullo.

Heading south reaches Voltri and ends its course in the Ligurian Sea, after being crossed by Autostrada A10, Genoa–Ventimiglia railway and Aurelia national road.

Cerusa basin (24 km2) is totally included in the Province of Genova.

[3] The Département de la Ceruse or Dipartimento della Cerusa of Ligurian Republic took its name at the end of the 18th century from the stream.