Pseudotyrannochthonius gigas is a species of pseudoscorpion in the Pseudotyrannochthoniidae family.

It was described in 1969 by Austrian arachnologist Max Beier.

[1] [2] The species occurs in the Western District of Victoria.

The type locality is Harman One Cave, Byaduk.

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