Cambarellus is a genus of small freshwater crayfish in the family Cambaridae. The 17 species are found in Mexico and the Gulf States of the United States. Among the Mexican species, three (C. areolatus, C. patzcuarensis and C. prolixus) are considered seriously threatened by the IUCN and C. alvarezi is already extinct. C. chihuahuae was also believed to be extinct until rediscovered in 2012. An orange form of C. patzcuarensis is regularly seen in the freshwater aquarium trade. The genus contains the following species: