Elongated Square Dipyramid
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Johnson Solid 
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- Blecksmith-Brillhart-Gerst Theorem
- Blichfeldt's Lemma
- Blichfeldt's Theorem
- BLM/Ho Polynomial
- Bloch Constant
- Bloch-Landau Constant
- Block
- Block Design
- Block Growth
- Block Matrix
- Block (Set)
- Blow-Up
- Blue-Empty Coloring
- Blue-Empty Graph
- Board
- Boatman's Knot
- Bochner Identity
- Bochner's Theorem
- Bode's Rule
- Bogdanov Map
- Bogomolov-Miyaoka-Yau Inequality
- Bohemian Dome
- Bohr-Favard Inequalities
- Bolyai-Gerwein Theorem
- Bolzano Theorem