'''B21''' may refer to: {{TOCright}} ==Places== * Kepong–Selayang Highway (Selangor state route B21), Malaysia * Autovía B-21, Spain; a motorway * Harumi Chūō (station code <code>B21</code>), Tokyo BRT, Tokyo, Japan * Mikamo Station (station code <code>B21</code>), Higashimiyoshi, Miyoshi, Tokushima, Japan; a train station * Shin-Hōsono Station (station code <code>B21</code>), Seika, Kyoto, Japan; a train station * Sugarloaf Regional Airport (FAA airport code <code>B21</code>), Franklin County, Maine, USA
==Transportation and vehicular== * B21 (New York City bus), a bus route serving Brooklyn, New York City, New York State, USA * Unterseeboot B-21, a WW1 German submarine
===Automotive=== * BSA B21 (1937–1939), a British motorcycle made by Birmingham Small Arms Company, Birmingham, England * Leyland B21 (1979–1985), a bus chassis manufactured by Leyland * Volvo Redblock Engine (B21), an automotive engine * Chevron B21, a racing prototype Group 5 sports car built by Chevron Cars Ltd
===Aviation=== * Northrop Grumman B-21 Raider, a 21st-century American stealth bomber * North American XB-21 ("B-21"), an experimental bomber aircraft developed in the late 1930s * B.21/35, British interwar twin-engined bomber
==Arts, entertainment, media== * B. 21 ({{langx|cs|link=no|Král a uhlíř||King and Collier}}), a Czech comic opera by Dvorak * B21 (band), a British bhangra group
==Other uses== * B-21 (machine), a cypher machine invented by Boris Hagelin<!--OK if first link red--> * Burroughs B21, a variant of the Burroughs B20 microcomputer * HLA-B21, an HLA - B serotype * Boron-21 (B-21 or <sup>21</sup>B), an isotope of boron * B21, a nuclear reactor at Dungeness nuclear power stations, Dungeness headland, southern Kent, England, UK
==See also== {{canned search|b21|b-21|b2-1|b-2-1|b21s}} * ''Must B 21'', a 2003 album by American singer will.i.am * 21B (disambiguation)
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