B1, B.I, B.1 or B-1 may refer to:
- B-1 cell, a lymphocyte type
- B-1 Lancer, a United States Air Force strategic bomber
- B1 (New York City bus) serving Brooklyn
- B1 type submarine, a WWII Imperial Japanese Navy submarine class
- Alsace-Lorraine B 1, a Alsace-Lorraine P 1 class steam locomotive
- Bradykinin receptor B1, a human gene
- Brasilsat B1, a 1994 communication satellite
- Char B1, a French heavy tank
- Fumonisin B1
- GS&WR Class B1, a Great Southern and Western Railway Irish steam locomotive
- HMS B1, a B-class submarine of the Royal Navy
- LB&SCR B1 class, a 1882 British express passenger steam locomotive
- LNER Thompson Class B1, a British steam locomotive
- NCC Class B1, a Northern Counties Committee Irish steam locomotive
- Proanthocyanidin B1, a B type proanthocyanidin
- PRR B1 and PRR B1 (steam), two American PRR steam locomotives models
- Saturn B-1, a 1959 four-stage rocket
- Vitamin B1, also known as thiamine
- USS B-1, a United States Navy B-class submarine
and also :
- Brooklyn's Number One, a 1990's rapper from St Albans, Queens, United States appearing on the Kool G Rap's 4,5,6 1995 album
- a subclass of B-class stars
- an international standard paper size (707 × 1000 mm), defined in ISO 216
- a level in the Common European Framework of Reference for Languages
- a security class in the TCSEC
- the code for permission to use specific land or premises for offices, light industry in town and country planning in the UK
- one of the two Bananas in Pyjamas
- a class of FM radio broadcasting in North America
Aircraft
Main article: List of B1 aircraft
Roads
Main article: List of B1 roads
See also
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