Obesophobia Fear of gaining weight.
Obesophobia Fear of obesity.
Objectshowphobia Fear of Object Shows . (branch of Kyrofelonoshophobia)
Oblitophobia Fear of forgetting.
Obscursolisphobia Fear of solar eclipse.
OCDphobia Fear of obsessive-compulsive disorder . (branch of Pathophobia or Ataxophobia)
Ochlophobia Fear of crowds or mobs.
Ochophobia Fear of vehicles.
Octagonphobia Fear of octagons.
Octaidekaphobia Fear of 18 . (branch of Numerophobia)
Octicentumphobia Fear of 800 . (branch of Numerophobia)
Octodecaphobia Fear of number 18
Octogintaphobia Fear of 80 . (branch of Numerophobia)
Octokontaheptaphobia Fear of 87 . (branch of Numerophobia)
Octophobia Fear of the number 8. (branch of Numerophobia)
Octophobia Fear of number 8 (branch of Numerophobia)
Odigoleoforeiouphobia Fear of bus drivers.
Odigotaxiphobia Fear of taxicab drivers.
Odontophobia Fear of teeth or dental surgery.
Odynephobia Fear of pain.
Odynophobia Fear of pain.
Oenophobia Fear of wines.
Officinaphobia Fear of shopping.
Ogdokontaheptaphobia Fear of number 87 (branch of Numerophobia)
Ogdoophobia Fear of eighths . (branch of Numerophobia)
Oggyphobia Fear of Oggy . (branch of Kyrofelonoshophobia)
Ohiophobia Fear of Ohio . (branch of Americanophobia)
Ohiphobia Fear of the word 'no'.
Oikophobia Fear of home surroundings, house.
Oklahomaphobia Fear of Oklahoma . (branch of Americanophobia)
Olfactophobia Fear of smells.
Olympicphobia Fear of the Olympics.
Omalonumerophobia Fear of even numbers (branch of Numerophobia)
Ombrophobia Fear of rain or of being rained on. (branch of Meteophobia)
Omegaphobia Fear of being last in line.
Omicronphobia Fear of O . (branch of Grammaphobia / Panophobia)
Ommatophobia Fear of eyes.
Ommetaphobia Fear of eyes.
Omniphobia Fear of all and when you have every fear.
Omphalophobia Fear of belly buttons.