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 Eastern Orthodox Church 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 Hyundai EO, as a Hyundai Elexio short name for the Chinese EV market National roads in Greece, whose road numbers begin with "EO" ()