SDI

SDI may refer to:

Companies and organizations

Scuba Diving International, a SCUBA training and certification agency
SDI Media Group, an entertainment subtitling and language services company
Slum Dwellers International, manages networks of the urban poor and slum dwellers that are organised into federations
Socialisti Democratici Italiani, the Italian Democratic Socialists, an Italian political party
Sunni Dawat-e-Islami, a non-political Sunni movement to propagate the Quran and Sunnah
Software Defined Infrastructure, Using software to define and deploy the technical infrastructure for application landscapes

Single document interface, a type of software application interface
Software Design Inc, mainframe systems software house responsible for GRASP, EPAT, UDC, FLEET
Spatial data infrastructure, a type of data infrastructure for geographic needs
Standard Drive Interconnect, a minicomputer interface standard by DEC
System Deployment Image, a Microsoft file format of an arbitrary disk image

Selective dissemination of information, a search task in information retrieval
Silt density index, a measure for the fouling capacity of water in reverse osmosis systems
Small diameter implant, a type of dental implant
Smoke-developed index, a measure of the concentration of smoke a material emits as it burns
Stand Density Index, a measure of the stocking of a stand of trees.
Sulfadimidine, an antibiotic

SDI (engine), a range of diesel engines by the Volkswagen Group for use in cars and vans
Serial digital interface, a communication standard used in professional video distribution
Subsurface drip irrigation, a buried dripperline irrigation system

Saidor Airport (IATA code), in Madang Province, Papua New Guinea
State Disability Insurance, a short-term disability income replacement in California and New York
Strategic Defense Initiative, U.S. anti-missile project under Ronald Reagan