Cambarellus diminutus is a species of crayfish in the family Cambaridae.

It is native to Mississippi and Alabama,[3][2] and is listed as Data Deficient on the IUCN Red List.

[1] The Cambarellus diminutus, known as the Least Dwarf Crayfish, is in the subgenus Pandicambarus of the genus Cambarellus,[4] this animal is typically 1–2 cm in size[5] and an omnivore that typically feeds on anything but should be fed a diet of sinking pellet.

The Least Dwarf Crayfish is a freshwater animal that can be found from Mississippi, Alabama, and southern Illinois[6] and adaptable to slight changes in water condition, and capable of year-round breeding[5]

A Revision of the Dwarf Crawfishes (Cambaridae, Cambarellinae), J. F. Fitzpatrick Jr.[1]