B5
# B5

B5, B05, B-5 may refer to:

## Biology

* ATC code B05 (Blood substitutes and perfusion solutions), a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System
* Cytochrome $b_5,$ ubiquitous electron transport hemoproteins
   * Cytochrome b5, type A, a human microsomal cytochrome b5
* HLA-B5, an HLA-B serotype
* Pantothenic acid (a.k.a. vitamin $B_5),$ a water-soluble vitamin
* Procyanidin B5, a B type proanthocyanidin

## Entertainment

* Alekhine's Defence (ECO code B5), a chess opening beginning with the moves e4 Nf6
* B5 (band), an R&B boy band
   * B5 (album), B5's self-titled debut album
* Babylon 5, an American science fiction television series
* The Be Five, a band formed by castmembers of Babylon 5

## Transport

* Amadeus (airline) (IATA code: B5), an airline based in Germany (1996–2004)
* B5 and B5 DOHC, models of the Mazda B engine series
* B-5, the manufacturer's model number for the Blackburn Baffin biplane
* B5 platform, the series designator for Audi A4 from 1994–2001
* Bundesstraße 5, a German federal highway
* HMS B5, a Royal Navy B-class submarine
* Keystone B-5, a light bomber made for the US Army Air Corps in the early 1930s
* Kinner B-5, a popular five cylinder American radial engine of the 1930s
* NSB B5 (Class 5), a series of passenger carriages built by Strømmens Værksted for the Norwegian State Railways
* PRR B5, an American 0-6-0 steam locomotive
* SM UB-5, a German Type UB I submarine or U-boat in the German Imperial Navy
* B5 biodiesel
* LNER Class B5, a British class of steam locomotives

## Other

* Baseball5, the five-a-side version of baseball
* B5 Championships, a 2001 fighting game tournament
* %B5, the percent-encoding for the letter μ
* B5, a paper size of the B series defined in ISO 216
* B5, a category of stellar classification
* Bensen B-5, a small rotor kite
* Border Five
