Fears & Phobias: Beginning with 'o'
Obesophobia: Fear of gaining weight.(Pocrescophobia)
Ochlophobia: Fear of crowds or mobs.
Ochophobia: Fear of vehicles.
Octophobia: Fear of the figure 8.
Odontophobia: Fear of teeth or dental surgery.
Odynophobia or Odynephobia: Fear of pain. (Algophobia)
Oenophobia: Fear of wines.
Oikophobia: Fear of home surroundings, house.
Olfactophobia: Fear of smells.
Ombrophobia: Fear of rain or of being rained on.