| Acronym | Definition |
|---|
| EFR | Early Failure Rate (reliability) |
| EFR | Emergency First Response/Responder |
| EFR | Enhanced Full Rate |
| EFR | External Fault Relay |
| EFR | End Function Review |
| EFR | Exchange for Risk (sales) |
| EFR | Experimental Forests and Ranges (USDA) |
| EFR | Explorations Fonctionnelles Respiratoires (French: Pulmonary Function Testing) |
| EFR | Envelope Following Response |
| EFR | École Française de Rome (French: French School of Rome; Rome, Italy) |
| EFR | Emerging Flux Region |
| EFR | Eastern Frontier Rifles (India) |
| EFR | Environmental Flow Requirement |
| EFR | Efficient Foodservice Response (initiative) |
| EFR | Eosinophilic Fungal Rhinosinusitis |
| EFR | École de Formation Routière (French: Road Training School) |
| EFR | Employee & Family Resources |
| EFR | Engineering Factual Report |
| EFR | Early Ford Registry (1903-1909) |
| EFR | Emergency Fire Response (gaming) |
| EFR | European Fast Reactor (reprocessing of spent nuclear fuels) |
| EFR | Entreprise de Filetage Roulé (French: Thread Wrap Company) |
| EFR | Environmental Field Report (Canada) |
| EFR | European Furnace Ropion (French furnace company) |
| EFR | Emergency Food Ration |
| EFR | Educational Foundations and Research (University of North Dakota) |
| EFR | Eastside Fire Rescue (Washington) |
| EFR | Ecole Familiale Rurale (French: Rural Family School) |
| EFR | Exhaust Fuel Ratio |
| EFR | Extended Focus Range (Leupold rifle scope) |
| EFR | Expiratory Flow Rate (pulmonary function testing) |
| EFR | Electronic Food Records (initiative) |
| EFR | Effective Resolution |
| EFR | Extended Flight Rules |
| EFR | Extended Frequency Range |
| EFR | Equity Fund Raising |
| EFR | European Financial Roundtable |
| EFR | Eagle First Responder |
| EFR | Equipment Facility Requirement |
| EFR | Elite Fighting Revolution (Northern Ireland, UK) |
| EFR | Equipment Failure Report |
| EFR | Engine Firing Rate |
| EFR | Electronic Failure Report |
| EFR | External Function Request |
| EFR | Expect Further Routing |
| EFR | Engineering Facility Requirement |
| EFR | Expatriate Failure Rate |
| EFR | Environment Flow Releases |
| EFR | Extracorporeal Flow Rate |