Cottus petiti, also called the Chabot du Lez, is a species of freshwater sculpin, a fish in the Cottidae family. It is endemic to France, found only in a small 3 km stretch of the Lez River in Southern France near Montpellier. The natural habitat is fed by karstic springs which may have enabled the isolated survival or the population through geoglogical history. Now the species may be threatened by habitat loss. The males of this species are typically 56 mm in length. It is part of the Cottus gobio complex, and genetically very close to C. gobio.