MSI may refer to:

Organizations

  • Macedonian Scientific Institute, an institution in Sofia, Bulgaria
  • Marketing Science Institute, a nonprofit learning institution in Cambridge, Massachusetts, US
  • Media Sport Investment, the international fund of investors that ran Sport Club Corinthians Paulista
  • Millennium Science Initiative, an international program bringing technology to developing nations
  • Ministry of Science and Innovation (New Zealand)
  • Minority-serving institution, in US higher education
  • MSI Reproductive Choices, an international non-governmental organisation providing contraception and safe abortion services, with a global HQ in London, UK
  • Museum of Science and Industry (Chicago), US
  • Science and Industry Museum, in Manchester, England
  • University of Minnesota Supercomputing Institute
  • Italian Social Movement (Movimento Sociale Italiano), a defunct post-fascist party

Companies

  • Micro-Star International, a Taiwanese information technology company
  • Midwest Scientific Instruments, a defunct American computer company
  • Morgan Stanley (Broker ID), an American financial services company
  • Motorola Solutions (NYSE: MSI), an American data communications and telecommunications equipment provider
  • Movie Star (company) (AMEX: MSI), an American clothing manufacturer

Science and technology

  • MSI Barcode, a continuous numeric barcode symbology
  • Microsatellite instability, an abnormality of DNA
  • Mass spectrometry imaging, a technique used in mass spectrometry
  • Mass sociogenic illness, the rapid spread of physical symptoms of illness among the members of a group with no physical or infectious cause
  • Magnetic source imaging, magnetoencephalography combined with magnetic resonance imaging
  • Multispectral imaging, the capture of multiple, specific wavelengths in the electromagnetic spectrum
  • Musculoskeletal injury, damage of muscular or skeletal systems which is usually due to a strenuous activity

Computing

  • .MSI, the filename extension of Windows Installer packages
  • Medium scale integration, a generation of integrated circuit chips which contain hundreds of transistors
  • Message Signaled Interrupts, a PCI 2.2 interrupt-mechanism
  • MSI protocol, a basic cache-coherence protocol used in multiprocessor systems

Other uses

  • Maison du Sport International, an office complex in Lausanne, Switzerland
  • Maritime safety information, emergency signal communication
  • Medical Service Insurance, the Government of Nova Scotia's health insurance
  • Mid-Season Invitational, an annual League of Legends tournament
  • Mindless Self Indulgence, an American rock band
  • Multistakeholder initiative, a governance structure
  • Inshore minesweeper (US Navy hull classification symbol: MSI), See List of mine warfare vessels of the United States Navy