ESO

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