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.
Ommetaphobia or Ommatophobia: Fear of eyes.
Oneirogmophobia: Fear of wet dreams.
Oneirophobia: Fear of dreams.
Onomatophobia: Fear of hearing a certain word or of names.
Ophidiophobia: Fear of snakes. (Snakephobia)
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Ophthalmophobia: Fear of being stared at.
Optophobia: Fear of opening one's eyes.
Ornithophobia: Fear of birds.
Orthophobia: Fear of property.
Osmophobia or Osphresiophobia: Fear of smells or odors.
Ostraconophobia: Fear of shellfish.
Ouranophobia: Fear of heaven.