Samhainophobia - Fear of Halloween.

Scolionophobia - Fear of school.

Selenophobia - Fear of the moon.

Sociophobia - Fear of social evaluation.

Sarmassophobia- Fear of love play. (Malaxophobia)

Satanophobia- Fear of Satan.

Scabiophobia- Fear of scabies.

Scatophobia- Fear of fecal matter.

Scelerophibia- Fear of bad men, burglars.

Sciophobia Sciaphobia- Fear of shadows.

Scoleciphobia- Fear of worms.

Scopophobia or Scoptophobia- Fear of being seen or stared at.

Scotomaphobia- Fear of blindness in visual field.

Scotophobia- Fear of darkness. (Achluophobia)

Scriptophobia- Fear of writing in public.

Selachophobia- Fear of sharks.

Selaphobia- Fear of light flashes.

Seplophobia- Fear of decaying matter.

Sesquipedalophobia- Fear of long words.

Sexophobia- Fear of the opposite sex. (Heterophobia)

Siderodromophobia- Fear of trains, railroads or train travel.

Siderophobia- Fear of stars.

Sinistrophobia- Fear of things to the left or left-handed.

Sinophobia- Fear of Chinese, Chinese culture.

Sitophobia or Sitiophobia- Fear of food or eating. (Cibophobia)

Snakephobia- Fear of snakes. (Ophidiophobia)

Soceraphobia- Fear of parents-in-law.

Social Phobia- Fear of being evaluated negatively in social situations.

Sociophobia- Fear of society or people in general.

Somniphobia- Fear of sleep.

Sophophobia- Fear of learning.

Soteriophobia - Fear of dependence on others.

Spacephobia- Fear of outer space.

Spectrophobia- Fear of specters or ghosts.

Spermatophobia or Spermophobia- Fear of germs.

Spheksophobia- Fear of wasps.

Stasibasiphobia or Stasiphobia- Fear of standing or walking. (Ambulophobia)

Staurophobia- Fear of crosses or the crucifix.

Stenophobia- Fear of narrow things or places.

Stygiophobia or Stigiophobia- Fear of hell.

Suriphobia- Fear of mice.

Symbolophobia- Fear of symbolism.

Symmetrophobia- Fear of symmetry.

Syngenesophobia- Fear of relatives.

Syphilophobia- Fear of syphilis.