ELSA
- ELSA Technology, a manufacturer of computer hardware
- European Law Students' Association
- European League of Stuttering Associations
- Experimental light-sport aircraft (E-LSA)
- European Land and Soil Alliance
- ELectronic Service Manual for all Volkswagen AG group cars, including Volkswagen, SEAT and Audi
- Enzyme Linked Sorbent Assay
- English Longitudinal Study of Ageing
- Extremely Large Synthesis Array, a proposed terrestrial optical/infrared interferometerical telescope
- ELSA Moot Court Competition
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