Sathrochthonius crassidens is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 1966 by Austrian arachnologist Max Beier.
The species occurs in eastern New South Wales. The type locality is Edith, 11 km south-east of Oberon.
The pseudoscorpions are terrestrial predators that inhabit plant litter.