SDF

SDF may reffer to:

Organizations

• Japan Self-Defense Forces, the current military forces in Japan
• Scouts de France, a Scouting association in France
• Serb Democratic Forum, an NGO of Serbs of Croatia
• Sudan Defence Force, the military organisation of Anglo-Egyptian Sudan from 1925 to 1955
• State Defense Force, military units in the United States that operate under the sole authority of a state government
• Stellar Development Foundation, a nonprofit foundation that aims at expanding financial access and literacy worldwide with Stellar payment network
• Syrian Democratic Forces, an alliance of Kurdish, Arab, Assyrian and other militias in Northern Syria.
• Sips Defence Force, an alliance of Persian, German, and Irish national forces to help defend the self governing state of the Free City of Sipstown, from neighbouring nations.

Political parties

• Sikkim Democratic Front, a political party of India
• Social Democratic Federation, Britain's first organised socialist political party (1884–1911)
• Social Democratic Federation (U.S.), a former political party in the United States (1936–1956)
• Social Democratic Forum, a former political party in Hong Kong (2000)
• Social Democratic Front (disambiguation)
• Socialist Democratic Federation (Japan), a former political party in Japan (1978–1994)

Computing

• Scientific Data Format, an implementation of the HDF5 standard
• SDF Public Access Unix System
• Signed distance function, a mathematical concept used in computer graphics
• Simple Data Format, a platform-independent file format capable of handling large multi-dimensional arrays
• Software development folder, a physical or virtual container for software project artifacts
• Spatial data file, a single-user geodatabase file format
• SQL Server Compact Edition Database File, a Microsoft database file format
• Standard Delay Format, a standard data structure for timing data
• Structure data file, a file format for a chemical table file
• Synchronous Data Flow, a computational model
• Syntax Definition Formalism, a metasyntax used to define context-free grammars

Science

• Stromal cell-derived factor (disambiguation), several human proteins
• Synchronous diaphragmatic flutter, the spasmodic contraction of the diaphragm (hiccup)
• Structure-Data File, a table file holding information about the atoms, bonds, connectivity and coordinates of a molecule
• Subwavelength-diameter optical fibre, an optical fibre with a diameter less than the photo-media wavelength

Other

• Louisville International Airport (IATA airport code SDF), an airport in Louisville, Kentucky, USA
• Service delivery framework, a reference model for service providers
• Simplified Directional Facility, an aviation instrument approach navigational aid
• SAME Deutz-Fahr, Italian-based agricultural machine manufacturer
• Südtirol Digital Fernsehen - TV station in South Tyrol
• Stochastic discount factor, an econometrical concept
• Super Dimension Fortress in the Macross anime series