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
See also
2BA BA2 (disambiguation) BAA (disambiguation) BBA (disambiguation) BA (disambiguation)