B13

B13 may refer to:
 * 130 mm/50 B13 Pattern 1936, Soviet naval gun
 * B13 (New York City bus) serving Brooklyn
 * B13 road (Cyprus)
 * B13tech, a futuristic fictional technology created by the character Brainiac 13
 * Bensen B-13, a Bensen aircraft
 * Boston Thirteens, a Rugby League club competing in the USARL
 * Chery B13, a 2007 Chinese Chery Automobile model
 * District B13, a movie featuring David Belle
 * HLA-B13, an HLA-B serotype
 * Martin XB-13, a version of the Martin B-10 bomber
 * Caro-Kann Defence, a common opening in the game of chess
 * Moseley, a suburb of Birmingham, England, from its postcode
 * Orotic acid, formerly known as Vitamin B
 * Boron-13 (B-13 or 13B), an isotope of boron
 * A chassis of the Nissan Sentra
 * Queensland B13 class locomotive
 * 13 amp, type B – a standard circuit breaker current rating
 * Jalan Uniten–Dengkil, in Selangor, Malaysia
 * LNER Class B13, a class of British steam locomotives