Mulciber is the surname of a wizarding family that is most likely pure-blood. Its members have traditionally attended Hogwarts School of Witchcraft and Wizardry and recent members have been Death Eaters.
Two members of different ages are mentioned, but their first names are unknown.
- One was a friend of Tom Marvolo Riddle
- The other was a friend of Severus Snape, of whom Lily Evans greatly disapproved.
Mulciber, meaning "smelter", is an alternate name for the Roman god of fire and metalurgy, Vulcan. It is also the name of a character from John Milton's Paradise Lost, who is the architect of a demon city and a fallen angel.