SDF

SDF may refer to:

File formats

 * Simple Data Format, for binary data
 * Spatial Data File, for geodatabases
 * Standard Delay Format, for timing data
 * SQL Server Compact Edition Database File (filename extension: )
 * Structure data file, for chemical tables
 * Scientific Data Format, a Hierarchical Data Format implementation

Formal computer science

 * Signed distance function (or field), in mathematical applications
 * Syntax Definition Formalism, to describe formal languages

Other uses in computing

 * Software development folder, a physical or virtual container for software project artifacts
 * Synchronous Data Flow, a restriction of Kahn process networks
 * SDF Public Access Unix System, a shared shell provider

Entertainment and media

 * Südtirol Digital Fernsehen, a TV station in South Tyrol, Italy
 * Super Dimensional Fortress, warships in the Robotech/Macross franchise
 * Settlement Defense Front (SDF), an enemy faction of Call of Duty: Infinite Warfare

Military forces

 * Japan Self-Defense Forces
 * State defense force, US
 * Sudan Defence Force, 1925–1955
 * Syrian Democratic Forces, North and East Syria

Political parties

 * Sikkim Democratic Front, India
 * Social Democratic Federation (United States), 1936–1956
 * Social Democratic Federation, UK, 1884–1911
 * Social Democratic Forum, Hong Kong, 2000
 * Social Democratic Front (disambiguation), Cameroon and Ghana
 * Socialist Democratic Federation (Japan), 1978–1994

Other organizations

 * Scouts de France, youth group
 * Serb Democratic Forum, Serbs of Croatia

Places

 * Louisville International Airport, Kentucky, US (by IATA code)
 * Soquel Demonstration State Forest, California, US

Science

 * Silver diammine fluoride, in dentistry
 * Stromal cell-derived factor (disambiguation), SDF1, SDF1a, etc.
 * Subwavelength-diameter optical fibre
 * Synchronous diaphragmatic flutter or hiccup

Other uses

 * SDF Group (SAME Deutz-Fahr), an Italian-based agricultural machine manufacturer
 * Simplified directional facility, an aviation instrument approach navigational aid
 * Stochastic discount factor, in econometrics