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

Organisations

European Standardisation Organisations: CEN (European Committee for Standardization), CENELEC (European Committee for Electrotechnical Standardisation) and ETSI (European Telecommunications Standards Institute)
Ensemble Studios Online
Edmonton Symphony Orchestra
Energijos skirstymo operatorius (ESO), Lithuanian electricity transmission network operator
Evergreen Symphony Orchestra, an orchestra in Taiwan
Eteläsuomalainen osakunta, a student nation at the University of Helsinki
Libyan External Security Organisation
External Security Organisation, the Ugandan external secret service
École secondaire d'Oka, a public high school in Oka, Quebec, Canada
National Grid Electricity System Operator (ESO), British electricity transmission network operator

English Symphony Orchestra and English String Orchestra, two related classical orchestral ensembles
Eso-Charis, Christian metal band (and self-titled album)
Bliss n Eso, Australian hip hop group