B5

B5 or B-5 may refer to:

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• Babylon 5, a television show.
• B5, a Mazda piston engine.
• Vitamin B5.
• The Keystone B-5, a light bomber of the United States Army Air Corps.
• HMS B5, a B-class submarine of the Royal Navy.
• B5, an international standard paper size (176×250 mm), defined in ISO 216.
• B5, the IATA code for East African Safari Air.
• B5, a teenage R&B group signed to Bad Boy Records