| Sacred things | Hierophobia |
| Saints | Hagiophobia |
| Satan | Satanophobia |
| Scabies | Scabiophobia |
| School | Scholionophobia |
| School going to | Didaskaleinophobia |
| Scratches | Amychophobia |
| Sea | Thalassophobia |
| Sea swell | Cymophobia |
| Sermons | Homilophobia |
| Sex | Genophobia |
| Sexual abuse | Agraphobia or Contreltophobia |
| Sexual intercourse | Coitophobia or Cypridophobia |
| Sexual perversion | Paraphobia |
| Sexual Questions | Erotophobia |
| Shadows | Sciophobia |
| Sharp objects | Belonophobia |
| Shellfish | Ostraconophobia |
| Shock | Hermephobia |
| Sinning | Peccatophobia |
| Sinning (unpardonable) | Enosiophobia |
| Sinning (imaginary crime) | Peccatophobia |
| Sitting | Cathisophobia |
| Sitting idle | Thassophobia |
| Skin | Dermatophobia |
| Skin disease | Dermatosiophobia |
| Skin lesions | Dermatophobia |
| Skin of animals | Dorophobia |
| Sleep | Hypnophobia or Somnophobia |
| Slime | Blennophobia |
| Small things | Microphobia |
| Smell | Olfactophobia |
| Smothering | Pnigerophobia |
| Snakes | Ophidiophobia |
| Snow | Chionophobia |
| Social situations | Social Phobia |
| Society | Anthropophobia |
| Solitude | Monophobia |
| Sound | Acousticophobia |
| Sourness | Acerophobia |
| Speaking | Lalophobia |
| Speaking aloud | Phonophobia |
| Speaking in public | Glossophobia |
| Speech | Lalophobia |
| Speed | Tachophobia |
| Spiders | Aracnophobia |
| Spirits | Demonophobia |
| Stairs | Climacophobia |
| Stage fright | Topophobia |
| Standing upright | Stasiphobia |
| Stared at | Scopophobia |
| Stars | Siderophobia or Astrophobia |
| Staying single | Anuptaphobia |
| Stealing | Cleptophobia |
| Step father | Vitricophobia |
| Step mother | Novercaphobia |
| Stings | Cnidophobia |
| Stooping | Kyphophobia |
| Stories | Mythophobia |
| Strangers | Xenophobia |
| Streets (crossing them) | Agyrophobia |
| String | Linonophobia |
| Stuttering | Psellismophobia |
| Suffering | Panthophobia |
| Sun | Heliophobia |
| Surgical operations | Ergasiophobia |
| Swallowing | Phagophobia |
| Symbolism | Symbolophobia |
| Symmetry | Symmetrophobia |
| Syphilis | Syphilophobia |
