Synsphyronus nullarborensis is a species of pseudoscorpion in the Garypidae family.

It was described in 1969 by Austrian arachnologist Max Beier.

[1][2] The species occurs on the Nullarbor Plain of South Australia and Western Australia.

The type locality is Toolinna Rockhole.

[2][1] The pseudoscorpions are terrestrial predators.