- Oikophobia- Is the fear about home surroundings, house
- Olfactophobia- Is the fear about smells
- Ombrophobia- Is the fear about rain or of being rained on
- Ommetaphobia or Ommatophobia- Is the fear about eyes
- Omphalophobia- Is the fear about belly buttons
- Oneirophobia- Is the fear about dreams
- Oneirogmophobia- Is the fear about wet dreams
- Onomatophobia- Is the fear about hearing a certain word or of names
- Ophidiophobia- Is the fear about snakes
- Ophthalmophobia- Is the fear about being stared at
- Opiophobia- Fear medical doctors experience of prescribing needed pain medications for patients
- Optophobia- Is the fear about opening one's eyes
- Ornithophobia- Is the fear about birds
- Orthophobia- Is the fear about property
- Osmophobia or Osphresiophobia- Is the fear about smells or odors
- Ostraconophobia- Is the fear about shellfish
- Ouranophobia or Uranophobia- Is the fear about heaven
- Pagophobia- Is the fear about ice or frost
- Panthophobia- Is the fear about suffering and disease
- Panophobia or Pantophobia- Is the fear about everything
- Papaphobia- Is the fear about the Pope
- Papyrophobia- Is the fear about paper
- Paralipophobia- Is the fear about neglecting duty or responsibility
- Paraphobia- Is the fear about sexual perversion
- Parasitophobia- Is the fear about parasites
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