ESO (disambiguation)
The European Southern Observatory is an astronomical research organisation.
ESO may also refer to:
- Employee stock option (also: executive stock option)
- Ether Saga Odyssey, a fantasy massively multiplayer online role-playing game
- The Elder Scrolls Online, a fantasy massively multiplayer online role-playing game
- Existential second-order logic
- ESO (motorcycles)
- Eso (town), Orhionmwon, Edo State, Nigeria