SDI

SDI may refer to:

Arts and entertainment

 * SDI (arcade game), 1987, by Sega
 * S.D.I. (video game), 1986, by Cinemaware

Companies and organizations

 * Samsung SDI, battery manufacturer
 * Scottish Development International
 * Scuba Diving International
 * SDI Media Group, providing subtitling and language services
 * SDI Presence, US IT consultancy
 * SDI Technologies, a consumer electronics manufacturer, New Jersey, U.S.A.
 * Service Desk Institute, for computer help desk staff
 * Slum Dwellers International
 * Socialisti Democratici Italiani (Italian Democratic Socialists), a political party
 * Software Design Inc.
 * Spiritual Directors International, supporting spiritual direction
 * Steel Dynamics, Inc., a steel producer, Indiana, US.A.

Computing and telecommunications

 * Serial data input in the Serial Peripheral Interface bus
 * Serial digital interface for sending video signals over coaxial cable
 * Single document interface, a style of graphical user interface
 * Software-defined infrastructure, with no human intervention
 * Spatial data infrastructure
 * Standard Disk Interconnect, a DEC standard
 * Statistical Design Institute's SDI Tools for Microsoft Excel
 * System Deployment Image, a Microsoft disk image file format

Medicine

 * Sulfadimidine, an antibiotic

Other uses in science and technology

 * Selective dissemination of information
 * Silt density index in reverse osmosis systems
 * Smoke-developed index, the concentration of smoke emitted by a material
 * Spiral Dynamics Integral, a model of evolutionary development
 * Stand density index, of the stocking of a stand of trees
 * Subsurface drip irrigation
 * Suction Diesel Injection, a Volkswagen diesel engine

Other uses

 * Saidor Airport (IATA code), in Madang Province, Papua New Guinea
 * Socio-Demographic Index of the Global Burden of Disease Study
 * State Disability Insurance of California, US
 * Strategic Defense Initiative, US anti-missile project