Protogarypinus giganteus is a species of pseudoscorpion in the Garypinidae family. It is endemic to Australia. It was described in 1954 by Austrian arachnologist Max Beier.
The species occurs in south-west Western Australia. The type locality is near the mouth of the Denmark River, Denmark, where the female holotype was found under tree bark.
The pseudoscorpions are terrestrial predators.