| Acronym | Definition |
|---|
| EWI | Elliott Wave International |
| EWI | EastWest Institute |
| EWI | Edison Welding Institute |
| EWI | Executive Women International |
| EWI | Electronic Wind Instrument (music) |
| EWI | Europäisches Währungsinstitut |
| EWI | Equal Width Increment |
| EWI | Electric Wind Instrument |
| EWI | Expert Witness Institute (UK) |
| EWI | Entered Without Inspection |
| EWI | Econet Wireless International |
| EWI | Environmental Waste International |
| EWI | Energiewirtschaftlichen Instituts |
| EWI | Education Wellington International (New Zealand) |
| EWI | Education With Industry (USAF) |
| EWI | Equal Weight Index |
| EWI | Energiewerke Isernhagen |
| EWI | Einführung in die Wirtschaftsinformatik |
| EWI | Encountering the World of Islam (Littleton, CO) |
| EWI | Environmental Writing Institute |
| EWI | East-West International (now EWI Resinsurance Intermediaries & Consultants) |
| EWI | Electronic Work Instruction |
| EWI | Explosive Waste Incinerator |
| EWI | Eijkman-Winkler Institute |
| EWI | European Web Index |
| EWI | Electro World, Inc. (Oviedo, Florida) |
| EWI | Early Warning Indicator |
| EWI | E-mail Waiting Indication (Seimens) |
| EWI | Enhanced Waveform Interpolative |
| EWI | Emailing While Intoxicated |
| EWI | Earth Weather Inc. |
| EWI | EasyWeb Inc. |
| EWI | Enterprise Wide Initiatives (MIT) |
| EWI | Est West Informatique |
| EWI | European Wireless Institute |
| EWI | Engineering Work Instructions |
| EWI | Electronic Warfare Intelligence |
| EWI | East West Infiniti Pvt Ltd (Pakistan) |
| EWI | EarthWatch Incorporated |
| EWI | Equipment World India |
| EWI | Educational Weather Information |
| EWI | Ecumenical Women's Initiative (gender equality movement) |