| Acronym | Definition |
|---|
| ECA | Economic Commission for Africa |
| ECA | Europe and Central Asia |
| ECA | Estatuto da Criança E do Adolescente (Brazilian: Child and Adolescent Statute) |
| ECA | Electrical Contractors Association (Ireland) |
| ECA | Entertainment Consumers Association (Wilton, CT, USA) |
| ECA | Educational and Cultural Affairs |
| ECA | Enhanced Capital Allowance |
| ECA | Export Credit Agency |
| ECA | Economic Commission for Latin America |
| ECA | Epidemiologic Catchment Area |
| ECA | Event-Condition-Action |
| ECA | European Court of Auditors |
| ECA | Ephedrine, Caffeine and Aspirin |
| ECA | European Cockpit Association |
| ECA | Economic Cooperation Administration |
| ECA | Enterobacterial Common Antigen |
| ECA | Eastern and Central Africa |
| ECA | External Carotid Artery |
| ECA | Embodied Conversational Agent |
| ECA | Economic Cooperation Agreement |
| ECA | ESCON Channel Adapter (Cisco) |
| ECA | Employment Conditions Abroad |
| ECA | Electronic Commerce Association (United Kingdom) |
| ECA | Emergency Care Attendant (Texas EMS certification level) |
| ECA | Extra-Curricular Activity |
| ECA | European Canoe Association |
| ECA | Emission Control Area (international maritime organization) |
| ECA | Escola de Comunicação E Arte (School of Communications and Arts, University of São Paulo, Brazil) |
| ECA | Electoral Council of Australia |
| ECA | Ecological Society of America |
| ECA | External Certification Authority |
| ECA | Escuela Campo Alegre |
| ECA | European Chemical Agency |
| ECA | Enforceable Consent Agreement |
| ECA | European Cocoa Association |
| ECA | Event Correlation and Analysis |
| ECA | Electrical Contractor's Association (United Kingdom) |
| ECA | Earth-Crossing Asteroids |
| ECA | Electrically Conductive Adhesive |
| ECA | Energy Conversion Agreement |
| ECA | Economic Community for Africa |
| ECA | Equivalent Clearcut Area (forest industry) |
| ECA | Eastern Contractors Association |
| ECA | Edgewood Chemical Activity (US Army; Aberdeen Proving Ground, Maryland) |
| ECA | Edmonton Construction Association |
| ECA | Electronics Control Assembly |
| ECA | Exchange Carrier Association |
| ECA | Environmental Compliance Assessment |
| ECA | Electronic Component Assembly |
| ECA | Early Comparability Analysis |
| ECA | Emergency Changeover Acknowledgement Signal (CCS #7 & ITU-T) |
| ECA | Electric Car Association |
| ECA | Electronic Components, Assemblies, Equipment and Supplies Association |
| ECA | Engineering Change Analysis |
| ECA | Electronic Control Amplifier |
| ECA | Earth Central Angle |
| ECA | Epilepsy, Childhood Absence |
| ECA | Engineering Criticality Assessment |
| ECA | Elliptic Curve Factoring Algorithm (cryptography) |
| ECA | Engine Control Amplifier |
| ECA | Eastern Cashmere Association (Upper Marlboro, Maryland) |
| ECA | Engineering Change Authorization |
| ECA | Emergency Controlling Authority |
| ECA | Earth Coverage Antenna |
| ECA | Equipment Condition Analysis |
| ECA | Early Compatibility Analysis |
| ECA | Electronic Cutover Advice (number portability in Australia) |
| ECA | Employment Counsellor's Assistant |
| ECA | Enemy Capability Assessment |
| ECA | Exponentially Correlated Acceleration |
| ECA | Ephedra, Caffeine and Acetylsalicylic Acid |
| ECA | Embroidery Council of America |
| ECA | Electrical Component Assembly |
| ECA | Entertainment Coaches of America Inc. |
| ECA | Examination, Certification and Analysis (performed during IQT) |
| ECA | European Communications Area |
| ECA | Earth Coverage Area |
| ECA | Electronic Clutch Actuator |
| ECA | Environmentally controlled Air |
| ECA | Evaluative & Corrective Action (US Army) |
| ECA | Ensayos Clinicos Aleatoreos (Spanish) |
| ECA | Exploration Consulting Associates, Ltd |
| ECA | Extended Central Area |
| ECA | Expected Cost of Attendance (college) |