SMI

SMI may refer to:

Business

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

Companies

 * 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

Computing

 * .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

Physics

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

Medical

 * Serious mental illness

Other uses

 * 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