FSB may refer to:

In technology:

• Front side bus, a data bus that carries information between the CPU and components
• Finite State Buffer, a computing term

Other:

• Fed eral Security Service of the Russian Federation (Abbreviated as FSB: Russian Secret Service)
• Facult&e acute; des Sciences de Bizerte, Tunisia
• Federalnaya Sluzhba Bezopasnosti (Fed eral Security Service of the Russian Federation)
• The Fuqua School of Business, the business school of Duke University in Durham, North Carolina
• Faglig Social Borgerliste
• Federal Savings Bank (in the United States)
• Fire support base or Fireb ase (Military encampment)
• FöreningsSparbanken, a Swedish bank now trading under the corporate name Swedb ank
• FSB , a Bulgarian band
• Federation of Small Businesses, UK
• Financial Services Board
• FSB Development, a software development company
• Falange Socialista Boliviana, a defunct Bolivian political party.
• Fi eld Station Berlin, an ASA/INSCOM cold war installation on Teufelsberg, Berlin (Germany)
• Fulb right Scholarship Board the United States
• FSB or FMOD Sample Bank — cross-platform file format containing packed sound samples
• Florida National High Adventure Sea Base, (commonly abbreviated FSB) a Boy Scout camp in the Florida Keys.