ISI

ISI or Isi may refer to:

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

Intercollegiate Studies Institute, a classically liberal 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 the Healthcare & Science business of the Thomson Reuters Corporation
Institute for Scientific Interchange, a theoretical scientific research centre based in Turin, Italy, EU
Inter-Services Intelligence, Pakistan's leading intelligence agency
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

Indian Statistical Institute, a public research institute and university near Kolkata, India
Indonesian Institute of the Arts, Denpasar
Indonesian Institute of the Arts, Surakarta, an arts university in Surakarta, Indonesia
Indonesian Institute of the Arts, Yogyakarta (Institut Seni Indonesia Yogyakarta), a state-owned college in Yogyakarta, Indonesia
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