Idiosoma occidentale is a species of mygalomorph spider in the Idiopidae family.

It was described in 1903 by British arachnologist Henry Roughton Hogg.

[1][2] The species occurs in north-west Western Australia.

The type locality is Roebourne in the Pilbara region, some 1,560 km north of Perth.

[1][2] The spiders are fossorial, terrestrial predators.