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 b5, 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 B₅), 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'' (album), B5's self-titled debut album * ''Babylon 5'', an American science fiction television series

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 * , 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, SM ''UB-5'', a German Type UB I submarine or U-boat in the German Imperial Navy * B5 biodiesel

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

Biology

Entertainment

Transport

Other

See also