The blue crayfish is Procambarus alleni, of which an electric blue morph is common in aquaria.
Blue crayfish may also refer to:
- Cherax quadricarinatus - tropical blue crayfish, or blue lobster, also common in aquaria
 - Cambarus monongalensis - Blue or Mononghela crayfish
 - Euastacus sulcatus - Blue or Lamington crayfish, from Australia
 
Also, three North American burrowing crayfish have 'blue' in their common name:
- Cambarus cymatilis - Conasauga blue burrower
 - Cambarus harti - Piedmont blue burrower
 - Cambarus loughmani - Blue Teays mudbug
 
See also
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