ESO may 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 Southern Observatory, an astronomical research organisation
 - 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
 - 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
 
Music
- 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
 
See also
- Esō, also known as Hyechong, a Korean priest who transmitted Buddhism to Japan
 
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