B14 may refer to:

• B14 (New York City bus)
• HLA-B14, an HLA - B serotype
• London Buses route B14
• Bundesstraße 14, federal highway in Germany
• Martin XB-14, a variant of the Martin B-10 bomber
• The generation of Nissan Sentra built from 1995 to 1999
• Volvo B14A engine
• Chery V5, a Chinese car, also known as Chery B14
• B14 (dinghy), the class of sailing dinghy designed by Julian Bethwaite
• LNER Class B14, a class of 5 British steam locomotives

• Caro–Kann Defence, Encyclopaedia of Chess Openings code
• B14-0,-5 and -7, a series of model rocket engines produced by Estes Industries from approximately 1968-1979
• Boron-14 (B-14 or ¹⁴B), an isotope of boron