| Acronym | Definition |
|---|
| ETI | Entreprise de Taille Intermédiaire (French: Medium Size Business) |
| ETI | Ente Tabacchi Italiani (Italian: Italian Tobacco Authority) |
| ETI | Ethical Trading Initiative (UK) |
| ETI | Enzymatic Therapy, Inc. (Green Bay, WI) |
| ETI | Extraterrestrial Intelligence |
| ETI | Ente Teatrale Italiano (Italy) |
| ETI | Employment Trends Index (The Conference Board) |
| ETI | Energy Technologies Institute (UK) |
| ETI | Extraterritorial Income |
| ETI | Ecole de Traduction et d’Interprétation (French: School of Translation and Interpretation, University of Geneva, Switzerland) |
| ETI | Enhance Technology, Inc. (Santa Fe Springs, CA) |
| ETI | Emergent Technologies Inc (Austin, TX) |
| ETI | Easy to Install |
| ETI | Expert Center for Taxonomic Identification |
| ETI | Elasticity of Taxable Income |
| ETI | Expert Technique International (French: International Technical Expert) |
| ETI | Economically Targeted Investment |
| ETI | Engineering Technical Information |
| ETI | Estimated Time of Intercept (US DoD) |
| ETI | Engineers Training Institute (various schools) |
| ETI | European Transport Infrastructure |
| ETI | Evolutionary Technologies International, Inc. |
| ETI | Ensemble Transport Interface |
| ETI | Environmental Technology Initiative |
| ETI | Elapsed Time Indicator |
| ETI | Europees Technologie Instituut (Dutch: European Institute of Technology) |
| ETI | Extrusion Technologies, Inc. (various companies) |
| ETI | Extra-Territorial Intelligence |
| ETI | Equator Technologies, Inc. |
| ETI | Effective Technology Integration (education) |
| ETI | Electrical Training Institute (of Southern California) |
| ETI | Edista Testing Institute (India) |
| ETI | Estimated Time to Invasion (game) |
| ETI | Echo Therapeutics, Inc. |
| ETI | Efficient Technology Inc (Redondo Beach, CA) |
| ETI | Enterprise Theory of Investigation (RICO statute) |
| ETI | Evolutionary Technology Insertion (military) |
| ETI | Earth Trance Interlude (band) |
| ETI | Enhanced Training in Idaho |
| ETI | Economic Trends and Issues |
| ETI | Elektronika Telekomunikacja Informatyka (Polish: Electronics Telecommunications Informatics) |
| ETI | Economical and Technological Intelligence (5th European Framework Programme) |
| ETI | Energy Time Indicator |
| ETI | Economics & Technology Incorporated |
| ETI | Estudiants de Traducció i Interpretació (Translation & Interpreting Students; Students Union) |
| ETI | Eagle Technologies Incorporated |
| ETI | Electro-Therm International (Belgium) |
| ETI | Enterprise Transition & Implementation |
| ETI | Enterprise Telephone Integration (CMA) |
| ETI | Extended Transaction Interface |
| ETI | East Texas Inspections (Grand Saline, TX real estate) |