Directory of Phobias - I
| Ice, Frost | Cryophobia |
| Ideas | Ideophobia |
| Ill (being) | Nosemaphobia |
| Illness | Nosophobia |
| Immobility of a joint | Ankylophobia |
| Imperfection | Atelophobia |
| Infection | Molysmophobia |
| Infested with worms | Helminthophobia |
| Infinity | Apeirophobia |
| Injury | Traumatophobia |
| Inoculations, Injections | Trypanophobia |
| Insanity | Lyssophobia or Maniaophobia |
| Insects | Entomophobia |
| Insects that cause itching | Acarophobia |
| Itching | Scabiophobia |