Cethegus broomi is a species of mygalomorph spider in the Euagridae family. It is endemic to Australia. It was described in 1901 by British arachnologist Henry Roughton Hogg.
The species occurs on the Northern Tablelands of New South Wales in open forest habitats. The type locality is Hillgrove, about 30 km east of Armidale.
The spiders are fossorial, terrestrial predators. They construct silk webs.