B11, B XI or B-11 may refer to:
- B11 (New York City bus) serving Brooklyn
- B-11 recoilless rifle, a Soviet 107 mm weapon
- Gareth Bale, a professional footballer from Wales
- Bavarian B XI, an 1895 German steam locomotive model
- Bensen B-11, a Bensen aircraft
- HMS B11, a B-class submarine of the British Royal Navy
- Bundesstraße 11, federal highway in Germany
- Caro-Kann Defence, Encyclopaedia of Chess Openings code
- Douglas YB-11, a bomber designed for the United States Army Air Corps
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