| Acronym | Definition |
|---|
| FNB | Fairfield National Bank (Lancaster, OH) |
| FNB | First Niagara Bank (New York) |
| FNB | First Northern Bank (California) |
| FNB | First National Bank |
| FNB | Food and Nutrition Board (Institute of Medicine, National Academy of Sciences) |
| FNB | Food Not Bombs |
| FNB | Fine Needle Biopsy |
| FNB | Food and Beverage (industry) |
| FNB | Fonds Négociables en Bourse (French: Negotiable Scholarship Fund; Canada) |
| FNB | Fédération Nationale des Boissons (French: National Federation of Beverages) |
| FNB | Fédération Nationale du Bois (French: National Wood Federation) |
| FNB | Front Nouveau de Belgique |
| FNB | Finska Notisbyrån (Finnish National News Agency) |
| FNB | Fédération Nationale Bovine (French: National Bovine Federation) |
| FNB | Flexible Network Bus |
| FNB | Fancy New Beesly (from The Office television series) |
| FNB | Fencing New Brunswick |
| FNB | Four Non Blondes (band) |
| FNB | Front of National Blocs (Iraq) |
| FNB | Frequency - Narrow Band |