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, 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'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 to 2001 Bundesstraße 5, a German federal highway Ceylon Government Railway B5, a steam locomotive class , 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
See also 5B (disambiguation) BV (disambiguation) Big Five (disambiguation)