Stanwellia pexa is a species of mygalomorph spider in the Pycnothelidae family.

It was described in 1930 by Australian arachnologist Vernon Victor Hickman.

[1][2] The species occurs in Tasmania, including Bass Strait islands, along coastlines in supralittoral habitats.

The type locality is Prince of Wales Bay, Derwent Park, Hobart.

[2] The spiders are fossorial, terrestrial predators.