The Stygian Bull, or Ophiotaurus, is a Greek creature.
The Stygian Bull has the foreparts of a black bull and a serpent's tail. It was killed by an ally of the Titans in the Titanomachy. It was said that if the bull was killed and its entrails were burned, it could bring the downfall of the gods. However, the Eagle of Zeus retrieved the entrails before they could be burned.
- Mother: Gaea