Tyrannochthonius cavicola is a species of pseudoscorpion in the Chthoniidae family. It is endemic to Australia. It was described in 1967 by Austrian arachnologist Max Beier.
The species occurs in eastern New South Wales. The type locality is The Grill Cave, Bungonia, some 125 km south-west of Sydney.
The arachnids are cave-dwelling, terrestrial predators.