Cethegus multispinosus is a species of mygalomorph spider in the Euagridae family. It is endemic to Australia. It was described in 1984 by Australian arachnologist Robert Raven.
The species occurs in Far North Queensland in open forest habitats on the Cape York Peninsula. The type locality is 80 km north of Musgrave.
The spiders are fossorial, terrestrial predators. They construct curtain-like silk webs.