| Acronym | Definition |
|---|
| ETR | Estimated Time of Return/Repair |
| ETR | ETSI (European Telecommunications Standards Institute) Technical Report |
| ETR | Entreprise de Travaux Routiers (French: Company of Road Works) |
| ETR | Équipe Technique Régionale (French: Regional Technical Team) |
| ETR | Expected to Be Ready (shipping) |
| ETR | Études Théologiques & Religieuses (French: Religious & Theological Studies) |
| ETR | Events to Remember (various locations) |
| ETR | Education, Training and Research (California) |
| ETR | Early to Rise (health e-zine) |
| ETR | Early Token Release |
| ETR | External Throughput Rate |
| ETR | Electronically Tuned Radio |
| ETR | External Time Reference |
| ETR | End of Term |
| ETR | Easy to Read |
| ETR | Eat the Rich |
| ETR | Etruscan (linguistics) |
| ETR | Effective Tax Rate |
| ETR | Estimated Time of Readiness (shipping) |
| ETR | Express Toll Route |
| ETR | Electron Transport Rate (biochemistry) |
| ETR | Education Training and Rehabilitation |
| ETR | Evaluation Team Report (Ohio educational system) |
| ETR | Eastern Test Range |
| ETR | Education and Training Resources (various locations) |
| ETR | Electronic Toll Road |
| ETR | Ecological Tax Reform |
| ETR | Estimated Time of Resolution (software repairs) |
| ETR | Energize to Run (solenoids) |
| ETR | Entreprendre en Territoire Rural (French: Business in Rural Territory) |
| ETR | Entreprise Téléphone Robini (French phone company) |
| ETR | Early Token Release (FDDI) |
| ETR | Engineering Test Reactor |
| ETR | Escape to Reality (various organizations) |
| ETR | Expected Treatment Response (psychotherapy model) |
| ETR | Electronic Time Recorder (clock) |
| ETR | Employer Trip Reduction (commuting cost cut) |
| ETR | Essex Terminal Railway |
| ETR | Electronics Technician Radar (US Navy) |
| ETR | Enjoy the Ride (travel agency) |
| ETR | Édition Téléphone Rouge (French: Red Phone Edition) |
| ETR | Everything That Rocks |
| ETR | Estimated Time of Restoration |
| ETR | Enabler Test Requirements (Open Mobile Alliance) |
| ETR | Electronically Tuned Receiver |
| ETR | Easy-To-Reach (ITU-T) |
| ETR | Emergency Trauma Response |
| ETR | Educator's Travel Resource |
| ETR | Export Traffic Release |
| ETR | Electronic Tax Register |
| ETR | Employment & Training Resources |
| ETR | Experimental Type Rating (US FAA) |
| ETR | External Timer Reference |
| ETR | Estimated Time Remaining |
| ETR | Electronic Target Range (UK) |
| ETR | Evaporator Temperature Regulator (air conditioning) |
| ETR | Experimental Test Reactor |
| ETR | Existing to Remain (architectural/design) |
| ETR | Engine Transaction Report |
| ETR | Energy Transfer Ratio |
| ETR | Embedded Training Requirements |
| ETR | Estimated Total Return |
| ETR | External Transfer Rate (Seagate) |
| ETR | Expanded Test Report |
| ETR | Engineering Technical Review |
| ETR | Expected to Realize |
| ETR | Energie-Transport-Reaktionsmodell (German: Energy Transport Reaction model) |
| ETR | Extra Testing Rule (reliability testing) |
| ETR | Engineering Test Requirements |
| ETR | Energy Trading & Risk |
| ETR | Extended Target Region |
| ETR | Equipamento Terminal de Rede (Portuguese) |
| ETR | End of Tour Report |
| ETR | Electronically Transmitted Return (US IRS) |
| ETR | Enhanced Toll Restriction (Teltronics Vision PBX) |