| Acronym | Definition |
|---|
| ESR | European Society of Radiology (Vienna, Austria) |
| ESR | Earlham School of Religion (Indiana) |
| ESR | Electron Spin Resonance |
| ESR | Eric S. Raymond |
| ESR | Equivalent Series Resistance (electronics) |
| ESR | Erythrocyte Sedimentation Rate (laboratory test) |
| ESR | Environmental Science and Research (New Zealand) |
| ESR | Estrogen Receptor |
| ESR | Employment Screening Resources (Novato, CA) |
| ESR | Educators for Social Responsibility |
| ESR | Early Stage Researcher |
| ESR | Electronic Staff Record (UK) |
| ESR | Enseignement Supérieur et Recherche (French: Higher Education and Research) |
| ESR | El Salvador, Chile (Airport Code) |
| ESR | Experimental Storage Ring (nuclear physics) |
| ESR | Electroslag Remelting |
| ESR | Essential Safety Requirements |
| ESR | Emergency Sun Reacquisition |
| ESR | Electronic Service Request |
| ESR | Errored Second Ratio |
| ESR | Earth Science Research |
| ESR | Electrical Substitution Radiometer |
| ESR | Electric Sun Roof |
| ESR | Electricity Supply Regulations |
| ESR | Edge Service Router |
| ESR | Essential Health and Safety Requirements |
| ESR | Electronic Scanning Radar |
| ESR | Environmental Surveillance Report |
| ESR | Eastern Shore Robotics (Maryland and Virginia) |
| ESR | Equipment Status Report |
| ESR | Early Storage Reserve |
| ESR | Early Site Review |
| ESR | Electrostatic Resistance |
| ESR | Electric Series Resistance |
| ESR | Equipment Status Reporting (US Air Force) |
| ESR | Effective Signal Radiated |
| ESR | Equivalent Service Round |
| EsR | Elite Soul Reapers (Counter-Strike gaming clan) |
| ESR | Expedited Safety Report |
| ESR | Error Source Register |
| ESR | Educational Skill Requirement |
| ESR | Employee Services Representative |
| ESR | Extended Slotted Ring |
| ESR | Event Service Routing (IPX) |
| ESR | Electronic Systems Reliability |
| ESR | Engineering Standard Reference |
| ESR | Engineering/Executive Service Request |
| ESR | Equipment Status & Inventory Reporting |
| ESR | Electronic Systems Review |
| ESR | Establishment Staff Relations |
| ESR | Epidemiology and Surveillance Research (American Cancer Society) |
| ESR | Expeditionary Service Ribbon (US Air Force) |
| ESR | External Satellite Repair |
| ESR | Early Strategy Review (US Army Test & Evaluation) |
| ESR | Einzahlungsschein mit Referenznummer (German: Payment Slip with Reference Number; Switzerland) |
| ESR | Environmental and Social Review |
| ESR | Enter Stage Right (various organizations) |
| ESR | European Street Racing (gaming) |
| ESR | Exposure Scenario Report (European Comission REACH-Directive) |
| ESR | Economic Self-Reliance (various organizations) |
| ESR | Earth and Space Research (Seattle, WA) |
| ESR | Enterprise Service Router (software) |