EO

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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

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

"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

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
Hyundai EO, as a Hyundai Elexio short name for the Chinese EV market