- Brother-Sister Marriage Myths
- brotium
- Brouncker
- Brouwer
- Brouwer crater
- Brouwer degree
- Brouwer fixed-point theorem
- Brouwerian algebra
- Brouwerian lattice
- Brouwerian semigroup
- Brouwer mapping theorem
- Brouwer-Poincaré theorem
- Brouwer theorem
- Browder
- Browder-Livesay invariant
- Brown
- brown
- brown adipose tissue
- brown agriculture
- brown algae
- brownbarred grouper
- brown brocade with linked-beads, horseman and lion patterns
- Brown calcic soil
- brown carbon
- brown cloud smoked furnace of Yue Kiln unearthed from Shuiqiu tomb