ISI

ISI or Isi may refer to:

Organizations

 * Intercollegiate Studies Institute, a classical conservative organization focusing on college students
 * Ice Skating Institute, a trade association for ice rinks
 * Indian Standards Institute, former name of the national standards body of India, the Bureau of Indian Standards
 * ISI mark, a product certification mark in India
 * Institute for Scientific Information, part of Clarivate Analytics (formerly the Healthcare & Science business of the Thomson Reuters Corporation)
 * Institute for Scientific Interchange, a theoretical scientific research centre based in Turin, Italy
 * Inter-Services Intelligence, an intelligence agency of Pakistan
 * International Statistical Institute, a professional association of statisticians
 * International Systems Institute, a scientific and educational corporation founded by Béla H. Bánáthy
 * Iron and Steel Institute, precedent organization to the Institute of Materials, Minerals and Mining
 * Islamic State of Iraq, an umbrella organization of a number of Iraqi insurgency groups
 * Integral Satcom Initiative, the European Technology Platform on Satellite Communications
 * Independent Schools Inspectorate, responsible for the inspection of independent schools and private further education colleges in England
 * Integrated Systems, Inc., a former developer of real-time operating systems
 * Image Space Incorporated, an independent video game developer
 * ImageSat International, an Israeli satellite imagery company

Schools and educational institutions

 * Indian Statistical Institute, a public research institute and university in Baranagar, Kolkata, India
 * Indonesian Institute of the Arts, a collective name of arts university in Indonesia:
 * Indonesian Institute of the Arts, Denpasar
 * Indonesian Institute of the Arts, Surakarta
 * Indonesian Institute of the Arts, Yogyakarta
 * Information Sciences Institute, a research and development unit of the University of Southern California's Viterbi School of Engineering
 * Institute of Scientific Instrumentation, a subsidiary of the Bangladesh University Grants Commission
 * Intercollegiate Studies Institute, a non-profit educational organization
 * International School Ibadan, a school located on the Campus of the University of Ibadan
 * International School of Iceland, a school located in Garðabær, Iceland, a suburb of the capital city of Reykjavík
 * Islamic School of Irving, in the Dallas-Fort Worth area

Science and technology

 * Information Sharing Index, former name of ContactPoint, a government database that held information on all children in England
 * Infrared Spatial Interferometer, an astronomical interferometer array of three telescopes
 * Interstimulus interval, the temporal interval between the offset of one stimulus to the onset of another
 * Intersymbol interference, a form of distortion of a signal in which one symbol interferes with subsequent symbols
 * Instruction Storage Interrupt, Segmentation fault of a PowerPC
 * In-service inspection

Other uses

 * Isi (name), personal name, sometimes an abbreviation of various other names
 * "Isi" (song), 1975 track by Neu! from the album Neu! '75
 * İsi, a village and municipality in Azerbaijan
 * Import substitution industrialization, a trade and economic policy