EO

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

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