| Acronym | Definition |
|---|
| FSB | Front-Side Bus |
| FSB | Federation of Small Businesses (UK) |
| FSB | Federal Savings Bank |
| FSB | Financial Services Board (South Africa) |
| FSB | Fakultet Strojarstva i Brodogradnje (Croatian: Faculty of Mechanical Engineering and Naval Architecture) |
| FSB | Forward Support Battalion (US Army) |
| FSB | Fire Support Base |
| FSB | Former Soviet Bloc (group of countries) |
| FSB | Free Software Business |
| FSB | Federalnaya Sluzhba Bezopasnosti (Russian: Federal Security Service; FSK successor since 1995) |
| FSB | Falange Socialista Boliviana (Bolivian Socialist Falange) |
| FSB | Florence Savings Bank |
| FSB | Fuqua School of Business (Duke University) |
| FSB | forward support base (US DoD) |
| FSB | Field Service Bulletin |
| FSB | Full System Backup (computer) |
| FSB | Flight Standardization Board |
| FSB | Financial Spread Betting (London) |
| FSB | First Star Bank |
| FSB | Front Sight Base |
| FSB | FlightSafetyBoeing |
| FSB | Functional System Block |
| FSB | Force Shaping Board (US Air Force) |
| FSB | Full Size Bronco (Ford vehicle club) |
| FSB | Full Size Bronco (vehicle) |
| FSB | Fasten Seat Belt (aviation) |
| FSB | Florida Sea Base (Islamorada, FL conference center) |
| FSB | Fully Split Bands (coin grading) |
| FSB | Forward Staging Base |
| FSB | Financial Systems Branch |
| FSB | Finjan SecureBrowsing |
| FSB | Fleet Satellite Broadcast |
| FSB | Fire Support Battery |
| FSB | Flow State Block |
| FSB | Final Staging Base |
| FSB | Fallout Studies Branch, Division of Biology & Medicine |
| FSB | Fuzzy Switchover Block |
| FSB | Floating Support Bases |
| FSB | Fuel Support Building |
| FSB | Full Search Block |
| FSB | Force Status Briefing (US Army) |
| FSB | Frankenmuth State Bank (Frankenmuth, Michigan) |
| FSB | Frequency - Same Bearing (tactical acoustic analysis) |
| FSB | Fleisher Smyth Brokaw LLC (A Denver, CO commercial real estate development firm) |
| FSB | Fiber Seeking Backhoe |
| FSB | Federation of Sneaky Bastards (airsoft team) |
| FSB | Factory System Bench |