- Aurora borealis
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- Austin
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- Ausuch
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- Author's annotations
- Author, Author
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- Autism
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- Automated Command Unit One
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- Automated janitorial system
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- Automobile
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- Autry
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- Av'tel
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- Available Light
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- Avalon Rising
- Avan
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- Avenue of the Emissary
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- Ayta
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- B.C. Cameron
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- B17 phaser cannon
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- BBI-993
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- BGS Ngaio
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- BH2 class
- BIQ'a'bIng Ocean
- BIQ'a'dung Ocean
- BIng'av Mountains
- BIng maneuver
- BItuHpa