Pseudotyrannochthonius hamiltonsmithi is a species of pseudoscorpion in the Pseudotyrannochthoniidae family. It is endemic to Australia. It was described in 1968 by Austrian arachnologist Max Beier.
The body length is 1.7âÂÂ2 mm. The colour is mainly olive-brown, with the chelicerae and pedipalps pale reddish-brown.
The species occurs in the Western District of Victoria. The type locality is Mount Widderin Cave, Skipton, 166 km west of Melbourne.
The pseudoscorpions are cave-dwelling, terrestrial predators.