B2, B02, B.II, B.2 or B-2 may refer to:
Aircraft
- AEG B.II, a German aircraft during World War I
- Albatros B.II, a 1914 unarmed German two-seat reconnaissance biplane
- Aviatik B.II, a 1915 German reconnaissance aircraft
- Blackburn B-2, a British biplane side-by-side trainer aircraft
- Brantly B-2, a helicopter
- Curtiss B-2 Condor, an American biplane bomber built before World War II
- DFW B.II, a 1914 German aircraft
- Euler B.II, a German Idflieg B-class designation aircraft
- Farman B.2, a French Farman aircraft
- Flanders B.2, a 1912 British experimental biplane
- Fokker B.II (1916), two different German unarmed observation aircraft of World War I
- Fokker B.II (1923), a 1923 Dutch reconnaissance flying boat
- Halberstadt B.II, a German Idflieg B-class designation aircraft
- Lohner B.II
- LVG B.II, a 1910s German two-seat reconnaissance biplane
- Northrop Grumman B-2 Spirit, an American stealth bomber of the United States Air Force
- Avro Vulcan B2, the Mark 2 version of a Royal Air Force V-Bomber aircraft
- Any Mark 2 bomber aircraft under the British military aircraft designation systems
Submarines
- USS B-2 (SS-11), an American B-class submarine of the US Navy
- HMS B2, one of eleven British B class submarines of the Royal Navy
- B2, a postcode area in central Birmingham
- B2 basketball league (Albania); see Albanian Basketball League
- B2, an international standard paper size defined in ISO 216 measuring 500 mm × 707 mm
- B2, a level in the Common European Framework of Reference for Languages
- B2, a code used by the land use planning system in the UK
- B2 star, a subclass of bluish-white B-class stars
- B02, Alekhine's Defence chess code
- B2 dye, also known as dyesol
- B2 (classification), a Paralympic disability classification
- Bi-2, a Russian rock band
- B2 intermetallic compound with equal numbers of atoms of two metals
- B2, an advanced model of battle droid in the Star Wars franchise
- B2, a brand of Canadian retailer Browns Shoes