B1
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B1 or B-1 may refer to:
- Vitamin B1.
- B1, a television station in Berlin, Germany.
- HMS B1, a B-class submarine of the Royal Navy.
- USS B-1, a B-class submarine of the United States Navy.
- The B-1 Lancer, a USAF heavy bomber aircraft.
- The Huff-Daland XB-1, an old American biplane bomber
- B1, an international standard paper size (1000×1414 mm), defined in ISO 216.