Cabangus regius is a species of sea slug, a dendronotid nudibranch, a shell-less marine gastropod mollusc in the family Dendronotidae.

[2] This species was described from Bunaken Island, Manado, Celebes Sea, Sulawesi, Indonesia.

[3] This is a small species of dendronotid, growing to a maximum size of 30 mm.

The tips of the dorsal appendages and rhinophore sheath processes are dark brown and there are rounded spots of the same colour scattered over the back and sides of the body.

A similar animal with raised, pointed tubercles on the body and dark brown rhinophore clubs is probably a distinct species.