SMI may refer to:

• Service Measurement Index, for IT services
• Swiss Market Index, of the stock market

• SensoMotoric Instruments, provider of eye tracking hard- and software
• Shepardson Microsystems, Atari 8-bit and Apple II software company
• SMI, brand of Silicon Motion ICs
• Speedway Motorsports (formerly Speedway Motorsports, Inc.), owner and operator of auto racing racetracks and related companies
• Shanghai Municipal Investment Group, China
• Sony Music India, Hindi music and film production company owned by Sony Music Entertainment

• .smi, file extension for SAMI files
• Scalable Memory Interconnect interface in Intel Xeon E7 processors
• .smi, self mounting image file extension
• Structure of Management Information, in SNMP
• .smi, file extension for Synchronized Multimedia Integration Language
• SMI, system management interrupt for System Management Mode
• Serial Management Interface, to configure an Ethernet PHY

• Vertico SMI or Vertico Spatially Modulated Illumination, a fast microscope

• Serious mental illness

• Sustainable Minerals Institute, Australia
• Sergeant major instructor in the British Army
• Shape Modeling International, annual scientific symposium
• Sports Management International, a fictional sports agency in the film Jerry Maguire
• St. Michael's Institution, a school in Malaysia
• Storage Management Initiative - Specification (SMI-S), a data storage standard
• Samos International Airport, Greece, IATA code
• Support for Mortgage Interest, a UK welfare benefit
• Social media intelligence
• Soil moisture index

This disambiguation page lists articles associated with the title SMI.
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