ESI or Esi may refer to:
Science and technology
- Earth Similarity Index
 - Electrospray ionization, a technique used in mass spectrometry
 - Environmental Seismic Intensity scale
 - Essential Science Indicators, by Clarivate
 - Electronic supplementary information, in scientific publications; for example see coordination polymerization
 
Computing
- Edge Side Includes, a markup language
 - Electronically stored information (Federal Rules of Civil Procedure)
 - Enclosure Services Interface, a computer protocol used in SCSI enclosures
 - Enterprise Southbridge Interface, a motherboard interface
 - ESI register, in the x86 microprocessor architecture
 
Medicine
- Electromagnetic source imaging
 - Emergency Severity Index, a triage algorithm
 - Epidural steroid injection
 
Organisations
- Electro Scientific Industries, an American high-technology company
 - Employees' State Insurance, in India
 - Ernst Strüngmann Institute, a German research institute
 - Erwin Schrödinger International Institute for Mathematical Physics, in Austria
 - Escadron spécial d'intervention, now the Belgian Federal Police Special Units
 - European Stability Initiative, a think tank
 - ITT Educational Services, owner of the defunct ITT Technical Institute
 
People
- Esi Awuah, Ghanaian academic
 - Esi Benyarku (born 1976), Canadian sprinter
 - Esi Edugyan (born 1978), Canadian novelist
 - Esi Sutherland-Addy, Ghanaian academic
 - Esikeli Tonga (born 1988), Australian rugby league player
 
Other uses
- Enhanced Station Initiative, of the New York City Subway
 - Enlightened self-interest, a philosophy in ethics
 - Environmental Sustainability Index
 - Ethical Sensory Introvert, in socionics
 - Export substitution industrialization
 - Early supplier involvement, an aspect of supplier integration in supply chain management; see Design for X
 - North Alaskan Inupiatun language (ISO 639-3 code)
 
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