| Acronym | Definition |
|---|
| FCSB | Fibre Channel Single Byte |
| FCSB | Football Club Steaua Bucharest (Romanian Club) |
| FCSB | Fédération des Centres Sociaux et Socioculturels de Bretagne (French: Federation of Social and Sociocultural Centers of Brittany) |
| FCSB | Focus Business Bank |
| FCSB | Football Club Stéphanais-Briçois (French football club) |
| FCSB | Five Column Springboard (iPhone library) |
| FCSB | Football Club Saint Brice (French football club) |
| FCSB | Fédération Canadienne des Sociétés de Biologie (French: Canadian Federation of Biological Societies) |
| FCSB | Football Club Sault-Brenaz (French football club) |
| FCSB | Federal Farm Credit Banks Consolidated Systemwide Bonds |
| FCSB | Fire Control Switchboard |
| FCSB | Future Corridor Sdn Bhd |
| FCSB | Football Club Santa Barbara (Soccer) |
| FCSB | Fairfield County Savings Bank (Ridgefield, CT) |