Cubiceps caeruleus, the blue fathead or cubehead, is a species of driftfish native to the Pacific and Atlantic oceans.

It is a pelagic fish that can be found at depths of from 20 to 250 metres (66 to 820 ft).

It mostly feeds on salps.

This species can reach a length of 25.6 centimetres (10.1 in) TL.

This Scombriformes-related article is a stub.