| Acronym | Definition |
|---|
| ESS | Electronic Switching System |
| ESS | European Social Survey |
| ESS | Earth and Space Sciences |
| ESS | Essential |
| ESS | Employee Self Service |
| ESS | Energy Storage System |
| ESS | Electronic Switching System (telephone central office exchange) |
| ESS | European Spallation Source |
| ESS | Environmental Stress Screening |
| ESS | Extended Service Set (IEEE 802.11 wireless networking) |
| ESS | Earth System Science |
| ESS | Enterprise Storage Server |
| ESS | Epworth Sleepiness Scale |
| ESS | Emergency Social Services |
| ESS | Etoile Sportive du Sahel (Sousse, Tunisia) |
| ESS | Emacs Speaks Statistics |
| ESS | European Security Strategy (EU) |
| ESS | European Statistical System |
| ESS | Endoscopic Sinus Surgery |
| ESS | Evolutionary Stable Strategy |
| ESS | Educational Support Services |
| ESS | Employee Share Scheme |
| ESS | Executive Support System |
| ESS | Electronic Security System |
| ESS | Ethernet Service Switch (Alcatel) |
| ESS | Endometrial Stromal Sarcoma (uterine cancer) |
| ESS | Eastern Sociological Society |
| ESS | Exercise and Sports Science |
| ESS | Eurest Support Services (Compass Group) |
| ESS | Équipe de Suivi de la Scolarisation (French: School Enrollment Monitoring Team) |
| ESS | Election Systems and Software |
| ESS | Enterprise Storage System |
| ESS | Exonic Splicing Silencer |
| ESS | Engineering Students' Society (various universities) |
| ESS | Engineering Support System |
| ESS | Engineering Systems Solutions |
| ESS | Enterprise Security System |
| ESS | Emergency Support Services |
| ESS | Escrow Encryption Standard |
| ESS | Engine Speed Sensor |
| ESS | Electrostatic Sensitive (devices) |
| ESS | Engagement Simulation System |
| ESS | Education Support Service (educational branch of UNICEF) |
| ESS | Ethiopian Scientific Society |
| ESS | Emergency Stop Switch |
| ESS | Empowered Software Solutions |
| ESS | Electronic Still Store (Ampex) |
| ESS | European Shiatsu School |
| ESS | Environmental Support System |
| ESS | Electronic Security Squadron (USAF) |
| ESS | Engine Synchro Shift |
| ESS | Embedded Security System |
| ESS | External Style Sheet |
| ESS | Economic Self-Sufficiency Services |
| ESS | Environmental Science Services, Inc. |
| ESS | Enforcement Support Services |
| ESS | Electronic Support System (subsystem to AWACS aircraft) |
| ESS | Engine Starting System |
| ESS | Egyptian Study Society (Denver, CO) |
| ESS | Economic Support Specialist |
| ESS | Enterprise Systems Solutions |
| ESS | Education and Science Society |
| ESS | Evaluation Survey Services (ACT, Inc.) |
| ESS | Expeditionary Support Squadron |
| ESS | Environmental Somatization Syndrome |
| ESS | Early Sound Scattering (acoustics) |
| ESS | Electronic Scoring Site |
| ESS | Errored Seconds - Section (Telabs) |
| ESS | Enterasys Security Specialist |
| ESS | External Storage System |
| ESS | Earth Simulator System (NEC supercomputer) |
| ESS | Ernestown Secondary School (Ontario, Canada) |
| ESS | Explosive Safety Standards |
| ESS | Exonic Splicing Suppressor |
| ESS | Experiment Support System |
| ESS | Every Show Sucks (Internet TV channel) |
| ESS | Exploitation Support System |
| ESS | Environmental Survey Satellite |
| ESS | Enlarged Scrotum Syndrome |
| ESS | European Snake Society |
| ESS | Earth and Space Sciences Division |
| ESS | ELINT Support System |
| ESS | Electronic Source Selection |
| ESS | Emergency Service Squad |
| ESS | Estimating System Survey |
| ESS | Ethernet Switch System (Alcatel) |
| ESS | Electrical Standards Set |
| ESS | Employee Satisfaction Score (Sprint) |
| ESS | Electronic/Environmental Stress Screening |
| ESS | Engineering Support Subsystem |
| ESS | Enhanced Sea Sparrow |
| ESS | Exercise Scoring System (US Coast Guard) |
| ESS | Enhanced Storage Solution (i-drive) |
| ESS | European Stars and Stripes |
| ESS | Exhaustive Service Scheduling |
| ESS | Eagles Service Society |
| ESS | Environmental Sampling Supply, Inc. (environmental sample equipment) |
| ESS | Ecologically Sound System |
| ESS | Engineering Equipment Surveillance System |
| ESS | Exact Stochastic Simulation (chemistry) |
| ESS | Exploration System of Systems (NASA) |
| ESS | Expeditionary Support Ship |
| ESS | Electronic Support Section (part of Inertial Upper Stage Solid Rocket, Boeing) |
| ESS | Electromagnetic Silencing System |
| ESS | Environmental Satellite Subpanel |
| ESS | Elanora State School (Gold Coast, Australia) |
| ESS | Electro Slag Surfacing |
| ESS | Electrostatic Sensors |
| ESS | Echo Suppression Subsystem |
| ESS | Early Supply Support |
| ESS | Electronic Support Shelter |
| ESS | Engineered Safeguard System |
| ESS | Emergency Spray System |
| ESS | Événement Significatif pour la Sûreté (French: Significant Event for Safety) |
| ESS | Exploration Support Segment |
| ESS | Extendable Support Structures (structure that supports solar arrays for space-based systems) |
| ESS | Electrical Shutdown System |
| ESS | Elementary Stepwise System (networks) |
| ESS | Entomological Society of Saskatchewan (Canada) |
| ESS | Egyptian Student Society |
| ESS | Enterprise Structure Study |
| ESS | Employment Scheduling System |
| ESS | Enterprise Systems Status |
| ESS | Earth Sensor Scan |
| ESS | Emergency Safing System |
| ESS | Electronics System Sector |
| ESS | Electronic Intelligence Support System |
| ESS | Explosive Safety Survey |
| ESS | Expendable Signal System |
| ESS | Expendable Sound Source |
| ESS | Entity Structure Step |
| ESS | Enhanced Signaling System |
| ESS | Extraction Steam System (nuclear Industry) |
| ESS | Educational Support Staff (various locations) |
| ESS | Electronic Safety and Security (various organizations) |
| ESS | Earth-Sun System (US NASA) |
| ESS | Encyclopedia of the Social Sciences |
| ESS | Enterprise Support Services (various locations) |
| ESS | ESPN (Entertainment and Sports Programming Network) Star Sports |
| ESS | Extra Statement Set |
| ESS | Enterprise Software Solutions (various organizations) |
| ESS | Elementary Science Study (various organizations) |
| ESS | ESET (Executive Security & Engineering Technologies, Inc.) Smart Security (antivirus software) |
| ESS | Epidemiological Surveillance System |
| ESS | Enrollment and Student Services (various schools) |
| ESS | Ekahau Site Survey (software) |
| ESS | Exploring the Solar System (astronomy education) |
| ESS | Engineering Support Service (various organizations) |
| ESS | Enterprise Search Summit (forum) |
| ESS | Executive Seminar Series (various organizations) |
| ESS | Employee Sex Survey |