SD may refer to:
Organisations
- Sicherheitsdienst (Security Service), the intelligence service of the Nazi SS
- Sinistra Democratica (Democratic Left), an Italian political party
- Sisters of the Destitute, a Syro-Malabar Catholic women's order
- Social Democrats (Slovenia), a left-wing Slovenian political party
- Solidariedade, a Brazilian political party
- Democratic Party (Poland) (Stronnictwo Demokratyczne), a defunct Polish party
- Sudan Airways (IATA airline designator: SD)
- Sweden Democrats, a right wing party in Sweden
- Swiss Democrats or Schweizer Demokraten, a right-wing political party in Switzerland
- Serbian Right (Srpska desnica), a political party in Serbia
Places
- San Diego, California
- Shandong, a province of China (Guobiao abbreviation: SD)
- South Dakota (US postal abbreviation)
- Sudan (ISO country code SD)
- Eswatini (formerly Swaziland), vehicle registration code SD
Science and technology
- Service design, the holistic design of end-to-end service experiences
- Spasmodic dysphonia, a voice disorder
- Stable disease, a possible outcome of chemotherapy according to the RECIST classification
- Spiral Dynamics, a model of individual and societal development
- Storm Data, US NOAA publication
- Subdwarf star
- Surface detector, of cosmic rays at the Pierre Auger Observatory
- System dynamics, understanding nonlinear systems
Electronics and computing
- SD card (Secure Digital), a flash memory card format
- Software Distributor, an HP-UX system
- Standard-definition television
- Super Density Disc, an optical disc format
Mathematics
- sd (elliptic function), one of Jacobi's elliptic functions
- Standard deviation, a mathematical statistical measure
Other uses
- Sekolah Dasar, term for primary school in Indonesia
- Super D (cycling), a class of mountain bike race
- Super deformed, an art style
- Sindhi language (ISO 639-1 code: sd)
- Southern Cross Decoration (SD), a South African military award
- sine die, Latin, undated (literally without a day)
- Smith & Wesson SD, a pistol
- SD radar. an early form of radar installed on US Navy submarines in World War II to provide warning of enemy aircraft
See also
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