Otarsis may refer to:
- Otarsis Quadrant, the quadrant where a Cylon listening post is detected by Boomer and Jolly (TOS: "Lost Planet of the Gods, Part I")
- Otarsis Quadrant asteroid, the celestial body where Boomer and Jolly were infected with the unknown ailment (TOS: "Lost Planet of the Gods, Part I")
- Battle of Otarsis Quadrant, the encounter with Cylon forces as an inexperienced female Warriors, forming the replacement Blue Squadron, escorts Doctor Salik and a medical team to the asteroid in order to determine the origins of the unknown ailment (TOS: "Lost Planet of the Gods, Part I")
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