- Mulciber is an alternative name of the Roman god Vulcan.
- Mulciber is the name of a character in Paradise Lost. He is the architect of the demon city of Pandemonium. This Mulciber is the same as the Roman god Vulcan above; in John Milton's poem, the pagan gods are all fallen angels.
- Mulciber is a fictional Death Eater in the Harry Potter series; see Minor Dark wizards in Harry Potter.
- Mulciber was the nickname of a prominent pirate in the Internet piracy scene and satellite piracy community, and he was also the only known American member of the infamous "European camp". He is rumoured to have been killed or arrested largely in part to his disappearance during a period of high profiled satellite piracy arrests in early 2006.