Euastacus crassus is a species of southern crayfish in the family Parastacidae.

[2][1] It is commonly known as the Alpine spiny crayfish.

[3][4] The IUCN conservation status of Euastacus crassus is "EN", endangered.

The species faces a high risk of extinction in the near future.

The IUCN status was reviewed in 2010.