Look up eso, eső, or eso- in Wiktionary, the free dictionary.

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

• 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

• Esō, also known as Hyechong, a Korean priest who transmitted Buddhism to Japan

This disambiguation page lists articles associated with the title ESO.
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