FSB may refer to:

Organizations[edit]

• Federal Security Service, the principal security agency of the Russian Federation.

Banking and finance[edit]

• Federal savings bank, a class of bank in the United States
• Federation of Small Businesses, a British lobbying group
• Financial Services Board (South Africa), a financial regulatory authority
• Financial Stability Board, an international group of financial authorities
• First Somali Bank, a bank headquartered in Mogadishu, Somalia
• Swedbank, formerly FöreningsSparbanken, a retail banking group

Computing[edit]

• Fast syndrome-based hash, cryptographic hash functions
• Front-side bus, a computer communication interface

Schools[edit]

• Farmer School of Business, at Miami University in the U.S. state of Ohio
• Friends School of Baltimore, a Quaker institution in Baltimore
• Fuqua School of Business, at Duke University in the U.S. state of North Carolina

Other[edit]

• FSB (band), a Bulgarian band
• Bolivian Socialist Falange (Spanish: Falange Socialista Boliviana), a Bolivian political party
• Brinjal fruit and shoot borer (Leucinodes orbonalis), a moth species
• Fellow of the Society of Biology, U.K.
• Fire support base, a temporary military encampment
• Forward support battalion, predecessor of brigade support battalion
• Fishbourne railway station, in England
• Fortune Small Business, a defunct magazine
• Trade Union Social Citizens List (Danish: Faglig Social Borgerliste), a Danish political group