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