B2A
B2A may refer to:
- Business-to-government (business-to-administration)
- Haplogroup B2a, a subtype of Haplogroup B (mtDNA)
- B2A (BRT), a bus route in Guangzhou
- B2A class, traditional motorcycles with sidecars in sidecar racing for the Sidecar World Championship
- Brantly B-2A light helicopter
- Northrop-Grumman B-2A Spirit stealth bomber
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