MSI

• 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