- Source: Orcus (disambiguation)
Orcus was a Roman god of the underworld.
Orcus may also refer to:
Orcus (dwarf planet), a trans-Neptunian dwarf planet
Orcus (beetle), a genus of beetles in the family Coccinellidae
Orcus Patera, a large elongated depression the planet Mars
Orcus (Dungeons & Dragons), a demon prince in the Dungeons & Dragons role-playing game
Orcus, a major villain in the science fiction/fantasy Empire of the East series by Fred Saberhagen