B5

B5, B05 or B-5 may refer to:
* B5, an (176×250 mm), defined in ISO 216
* B5, a Japanese standard paper size (182×257 mm)
* B5, shorthand for "Babylon 5", a science fiction television series
* %B5, the URL encoded version of the µ (mu) character
* B5 (band), a teenage R&B group previously signed to Bad Boy Records
* B5 star, a subclass of B-class stars
* B05, Alekhine's Defence Encyclopedia of Chess Openings code
* ATC code B05, section of the Anatomical Therapeutic Chemical Classification System
* Bavarian B V, a 1853 German steam locomotive model
* Bensen B-5, a 1953 American small rotor kite
* Blackburn B-5, a 1934 British torpedo bomber
* Cytochrome b5, an ubiquitous protein
* Cytochrome b5, type A, a human mitochondrial gene
* HLA-B5, an HLA - B serotype
* HMS B5, a British B class submarine
* Keystone B-5, a light bomber of the United States Army Air Corps
* Kinner B-5, a WWII engine for light general and sport aircraft
* Lohner B.V, an aircraft model
* Mazda B5, a piston engine
* PRR B5, an American
* SM "UB-5", a 1915 German Type UB I U-boat
* Vitamin B5, another name for pantothenic acidand also :

Transportation and energy

* B5, the IATA airline designator for Amadeus Flugdienst
* The B5 platform used for the Audi A4 1995-2001 models
* A blend of 5% of biodiesel with petrodiesel, also written as BD5
* Bundesstraße 5, a German road
* B5 road (Cyprus)