ESI

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
 * ESI Hospital metro station, Delhi
 * ESI Hospital metro station (Hyderabad)
 * 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 Buobasa, Ghanaian activist
 * Esi Edugyan (born 1978), Canadian novelist
 * Esi Lufo (born 2001), Albanian footballer
 * 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)