B2, B02, B.II, B.2 or B-2 may refer to:

Transportation

Aircraft

• B-2 Spirit, an American stealth bomber of the United States Air Force
• 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
• Bensen B-2, a Bensen 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
• 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

Locomotives

• Alsace-Lorraine B 2, a Alsace-Lorraine P 1 class steam locomotive
• Bavarian B II, a 1851 German steam locomotive model
• GS&WR Class B2, a Great Southern and Western Railway Irish steam locomotive
• LB&SCR B2 class, a British LB&SCR locomotive
• LNER Thompson Class B2, a British class of 4-6-0 steam locomotive
• NCC Class B2, a Northern Counties Committee Irish steam locomotive
• PRR B2, an Amrerican PRR 0-6-0 steam locomotive

Submarines

• USS B-2 (SS-11), an American B-class submarine of the United States Navy
• HMS B2, one of eleven British B class submarines of the Royal Navy

Roads

Other

• B2 (New York City bus) serving Brooklyn
• B2, the IATA airline designator code for Belavia Belarusian Airlines
• B2, East coast district of Bray, Co.Wicklow, Ireland
• B2 (İstanbul) - a commuter line in İstanbul, also known as the Sirkeci-Halkalı line.
• Marussia B2, a high-performance luxury sports coupé built by Russian automaker Marussia Motors

Computing

• b2/cafelog, the precursor to the WordPress blogging software
• B2evolution, a multi-lingual, multi-user, multi-blog publishing system
• B2, a subclass of security level B as defined by Trusted Computer System Evaluation Criteria (TCSEC) standards

People and characters

• B2, the name of a character from the Dutch television series Bassie en Adriaan
• B-2 or B² (B squared), the stage name used by wrestler Barry Buchanan
• B2, one of a pair of bananas featured in the children's television show Bananas in Pyjamas

Visas

• South Korea B-2 visa, a tourist or transit visa granted by South Korea
• United States B-2 visa, a cohabitant visa granted by the United States of America

Biology

• ATC code B02 Antihemorrhagics, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Bradykinin receptor B₂, a human gene
• Proanthocyanidin B2, a B type proanthocyanidin
• Vitamin B₂

Other

• 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
• Bi-2, a Russian rock band

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