Tyrannochthonius billhumphreysi is a species of pseudoscorpion in the Chthoniidae family.

It was described in 2008 by Australian arachnologists Karen Edward and Mark Harvey.

[1][2] The species occurs in the Murchison bioregion of Western Australia.

The type locality is a borehole on Sturt Meadows Station, some 40 km north-west of Leonora.

[1][2] The arachnids are cave-dwelling, terrestrial predators.