| Acronym | Definition |
|---|
| FLB | Federal Land Bank |
| FLB | Francesca Lia Block (author) |
| FLB | Front de Liberation de la Bretagne (French: Breton Liberation Front) |
| FLB | Format Library |
| FLB | Fédération Luxembourgeoise de Boxe (French: Luxembourg Boxing Federation; Luxembourg) |
| FLB | Framed, Ledged & Braced (wood design) |
| FLB | Fantasy League Baseball |
| FLB | Forward Logistics Base |
| FLB | Family Life Bureau (various locations) |
| FLB | Fédération Libanaise de Basketball (French: Lebanese Basketball Federation) |
| FLB | Fat Lazy Bastard |
| FLB | First Liberty Bank (various locations) |
| FLB | Fonderie et Laminoir de Breteuil (French foundry) |
| FLB | Fisheries Loan Board (Canada) |
| FLB | Freshfield Lane Brickworks (UK) |
| FLB | Fly Like A Bird (song) |
| FLB | Folsom Lake Bowl (Folsom, CA) |
| FLB | Fluorescently Labeled Bacteria |
| FLB | Flow Brazing |
| FLB | Funny Looking Beat (medical/cardiac slang) |
| FLB | Freelance Blues (comic book) |
| FLB | Fat Little Buddies (tavern; Ohio) |
| FLB | Funny Little Beat (EMS slang) |