B11

B11, B.XI or B-11 may refer to:

Transportation

 * B11 (New York City bus) serving Brooklyn
 * Bundesstraße 11, federal highway in Germany

Vehicles

 * HMS B11, a B-class submarine of the British Royal Navy
 * Bavarian B XI, an 1895 German steam locomotive model
 * Bensen B-11, a Bensen Aircraft model
 * Douglas YB-11, a bomber designed for the United States Army Air Corps
 * Nissan B11, a version of the Nissan Sunny
 * Volvo B11R, a coach bus chassis manufactured by Volvo since 2011

Other uses

 * B-11 recoilless rifle, a Soviet 107 mm weapon
 * Gareth Bale, a professional footballer from Wales
 * Boron-11 (B-11 or 11B), an isotope of boron
 * Caro-Kann Defence, Encyclopaedia of Chess Openings code B11