| Country | Natural hazards |
| Guatemala | numerous volcanoes in mountains, with occasional violent earthquakes; Caribbean coast extremely susceptible to hurricanes and other tropical storms |
| Guernsey | NA |
| Guinea | hot, dry, dusty harmattan haze may reduce visibility during dry season |
| Guinea-Bissau | hot, dry, dusty harmattan haze may reduce visibility during dry season; brush fires |
| Guyana | flash floods are a constant threat during rainy seasons |
| Haiti | lies in the middle of the hurricane belt and subject to severe storms from June to October; occasional flooding and earthquakes; periodic droughts |
| Heard Island and McDonald Islands | Mawson Peak, an active volcano, is on Heard Island |
| Holy See (Vatican City) | NA |
| Honduras | frequent, but generally mild, earthquakes; extremely susceptible to damaging hurricanes and floods along the Caribbean coast |
| Hong Kong | occasional typhoons |
| Hungary | void |
| Iceland | earthquakes and volcanic activity |
| India | droughts; flash floods, as well as widespread and destructive flooding from monsoonal rains; severe thunderstorms; earthquakes |
| Indian Ocean | occasional icebergs pose navigational hazard in southern reaches |
| Indonesia |  occasional floods; severe droughts; tsunamis; earthquakes; volcanoes; forest fires |
| Iran | periodic droughts, floods; dust storms, sandstorms; earthquakes |
| Iraq |  dust storms; sandstorms; floods |
| Ireland | NA |
| Isle of Man | NA |
| Israel | sandstorms may occur during spring and summer; droughts; periodic earthquakes |
| Italy | regional risks include landslides, mudflows, avalanches, earthquakes, volcanic eruptions, flooding; land subsidence in Venice |
| Jamaica | hurricanes (especially July to November) |