SD

SD may refer to:

• SD (rapper), is a rapper from Chicago
• Sekolah Dasar, an Indonesian junior school
• Sindhi language's ISO 639-1 code
• Sisters of the Destitute, a Syro-Malabar Catholic women's order
• Southern Cross Decoration (SD), a South African military award
• Spasmodic dysphonia
• Storm Data, a NOAA publication summarizing severe weather events in the United States
• Sudan Airways' IATA airline designator
• Super deformed
• Surface Detector

Organizations

• [Sicherheitsdienst] Error: {{Lang}}: text has italic markup (help), the intelligence service of the Nazi SS
• [Sinistra Democratica] Error: {{Lang}}: text has italic markup (help) or Democratic Left, an Italian political party
• Social Democrats (Slovenia), a left-wing Slovenian political party
• [Stronnictwo Demokratyczne] Error: {{Lang}}: text has italic markup (help), Democratic Party, a defunct Polish party
• Sweden Democrats, a nationalist party in Sweden
• Swiss Democrats or [Schweizer Demokraten] Error: {{Lang}}: text has italic markup (help), a right-wing political party in Switzerland

Places

• South Dakota, United States postal abbreviation
• Sudan's ISO country code

Science and technology

• Standard-definition television
• Secure Digital, a flash memory card format
• Software Distributor, an HP-UX software package management system
• Standard deviation, a mathematical statistical measure
• Subdwarf star, a star with luminosity 1.5 to 2 magnitudes lower than that of a main-sequence star of the same spectral type
• Super Density disc, an optical disc storage format precursor to the DVD

See also

• SD1 (disambiguation)
• MP5SD