| Iliwerung(noun, name, volcano, geology) |
| Inielika(noun, name, volcano, geology) |
| Iojima(noun, name, volcano, geology) |
| Irruputuncu(noun, name, volcano, geology) |
| Ischia(noun, volcano, settlement, habitation) |
| Isluga(noun, name, volcano, geology) |
| Izalco(noun, name, volcano, geology) |
| Izu-Tobu(noun, name, volcano, geology) |
| Jailolo(noun, name, volcano, geology) |
| Jocotitlan(noun, name, volcano, geology) |
| Jolnir(noun, name, volcano, geology) |
| Kapoho(noun, volcano, settlement, habitation) |
| Karymsky(noun, name, volcano, geology) |
| Katla(noun, name, volcano, geology) |
| Kavachi(noun, name, volcano, geology) |
| Kawerau(noun, volcano, settlement, habitation) |
| Ketoy(noun, name, volcano, geology) |
| Kharimkotan(noun, name, volcano, geology) |
| Kilauea(noun, name, volcano, geology) |
| Kizimen(noun, name, volcano, geology) |