B43 or b43 may refer to:
- Broadcom b43, linux wifi-driver and firmware
- Bundesstraße 43, a German road
- B43 (New York City bus) in Brooklyn
- B43 nuclear bomb
- B43, an anti-CD19 antibody
- B-43 Jetmaster, an aircraft
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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