Withius piger is a species of pseudoscorpion in the Withiidae family.

It was described in 1878 by French arachnologist Eugène Simon.

[1][2] The species has a cosmopolitan distribution, often in human-dominated environments, and has been widely introduced.

The type locality is Bou Saâda, Algeria.

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