• Iatrophobia - Fear of going to the doctor or of doctors
• Ichthyophobia - Fear of fish
• Ideophobia - Fear of ideas
• Illyngophobia - Fear of vertigo or feeling dizzy when looking down
• Insectophobia - Fear of insects
• Iophobia - Fear of poison
• Islamophobia - Fear of Muslims
• Isolophobia - Fear of solitude, being alone
• Isopterophobia - Fear of termites, insects that eat wood
• Italophobia - Fear of Italians