Bacillophobia - Fear of of microbes, bacilli (bacteria) or germs.
Bacteriophobia - Fear of bacteria.
Ballistophobia or Ballistrophobia - Fear of missiles or bullets.
Barophobia - Fear of gravity.
Basiphobia or Basophobia - Fear of not being able to stand and walk.
Bathmophobia - Fear of stairs or steep slopes.
Bathophobia - Fear of depth.
Batophobia - Fear of heights or being close to high buildings.
Batrachophobia - Fear of amphibians, such as frogs, newts, salamanders, etc.
Belonephobia or Belonophobia - Fear of pins and needles. (Aichmophobia)
Bibliophobia - Fear of books.
Blennophobia - Fear of slime.
Bogyphobia - Fear of the bogeyman.
Bolshephobia - Fear of Bolsheviks.
Botanophobia - Fear of plants.
Bromidrophobia or Bromidrosiphobia or Bromidrosophobia- Fear of body smells.
Brontophobia - Fear of thunder and lightning.
Bufonophobia - Fear of toads.