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 two (C. alvarezi and C. chihuahuae) are already extinct. An orange form of C. patzcuarensis is regularly seen in the freshwater aquarium trade. The genus contains the following species: