| Acronym | Meaning |
| B | Baht (currency of Thailand) |
| B | Balboa (currency of Panama) |
| B | Beam (naval architecture; width of hull) |
| B | Bilateral |
| B | Biological |
| B | Birmingham (postcode, United Kingdom) |
| B | Boat (Stores 100 code) |
| B | Bolivar (unit of currency) |
| B | Bombardier |
| B | Bomber (US military aircraft designation; as in B-52) |
| B | Bridge |
| B | Butt (welded joint type) |
| B | Cross-Over Barrier Pattern (US DoD) |
| B | Federal Reserve Bank of New York City (designates original spot of circulation of a bill) |
| B | Individual (IRB) |
| B | Tical (another name for baht, Thai currency) |
| B | US Domestic Stamp Rate (18 cents, issued 15 May 1981) |