• Bacillophobia - Fear of microbes
• Bacteriophobia - Fear of bacteria
• Ballistophobia - Fear of missiles or bullets
• Barophobia - Fear of gravity
• Basiphobia - Fear of walking or falling
• Basophobia - Fear of the inability to stand
• Bathmophobia - Fear of stairs or steep slopes
• Bathophobia - Fear of depth
• Batophobia - Fear of heights or being close to high buildings
• Batrachophobia - Fear of frogs and other amphibians
• Belonephobia - Fear of needles or pins
• Bibliophobia - Fear or hatred of books
• BII phobia - fear of blood, injury, or injections
• Biphobia - Fear of bisexuality or bisexuals
• Blennophobia - Fear of slime
• Bogyphobia - Fear of bogeys or the bogeyman
• Bolshephobia - Fear of Bolsheviks
• Botanophobia - Fear of plants
• Bromidrophobia - Fear of body smells
• Bromidrosiphobia - Fear of human body odor
• Brontophobia - Fear of thunder and lightning
• Bufonophobia - Fear of toads