Eo or EO may refer to:
Businesses and organizations
- Education Otherwise, a home education organization
 - Elevorganisasjonen, a Norwegian student organization
 - Entrepreneurs' Organization, a nonprofit network
 - Evangelische Omroep, a public broadcaster in the Netherlands
 - Executive Outcomes, a South African military company
 - Express One International, an airline
 - Hewa Bora Airways (IATA code EO), a defunct airline in the Democratic Republic of the Congo
 
Language
- Eo (constructed language)
 - Esperanto (ISO code EO), a constructed language
 - eo (digraph), represents a single or two vowels in some languages
 - Eo (hangul) vowel in Korean Hangul
 
Science and technology
Computing
- EO Personal Communicator, an early tablet computer produced by AT&T subsidiary EO, Inc.
 - Eight Ones, a character code
 - A line of tablet computers made by TabletKiosk
 
Other uses in science and technology
- "eo-" (derived from "Eos", meaning "dawn"), used to describe many early animals in the fossil record
- Eoarchean, the first era of the Archean Eon
 
 - Earth observation
 - Electro-optics
 - Eosinophilic oesophagitis, or Eosinophilic esophagitis, an allergic inflammatory condition of the esophagus
 - Ethylene oxide, a chemical compound
 - Extremal optimization, a type of optimization heuristic inspired by self-organized criticality
 
Other uses
- Eastern Orthodoxy, a major Christian branch.
 - EO (film), a 2022 film
 - EO (rapper), a rapper from London
 - Eo (river), a river in Spain
 - Eo (instrument), a Korean percussion instrument
 - East Otago, part of New Zealand's South Island
 - Captain EO, a 3D film
 - Equal opportunity, a term related to civil rights
 - Equipment Operator (US Navy), a Seabee occupational rating in the U.S. Navy
 - Executive Officer, a person responsible for the running of an organization
 - Executive order (United States), a directive issued by the President of the United States
 
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