| Country | Natural hazards |
| Afghanistan | damaging earthquakes occur in Hindu Kush mountains; flooding; droughts |
| Akrotiri | void |
| Albania | destructive earthquakes; tsunamis occur along southwestern coast; floods; drought |
| Algeria | mountainous areas subject to severe earthquakes; mudslides and floods in rainy season |
| American Samoa | typhoons common from December to March
volcanism: American Samoa experiences limited volcanic activity on the Ofu and Olosega Islands, neither has erupted since the 19th century |
| Andorra | avalanches |
| Angola | locally heavy rainfall causes periodic flooding on the plateau |
| Anguilla | frequent hurricanes and other tropical storms (July to October) |
| Antarctica | katabatic (gravity-driven) winds blow coastward from the high interior; frequent blizzards form near the foot of the plateau; cyclonic storms form over the ocean and move clockwise along the coast; volcanism on Deception Island and isolated areas of West Antarctica; other seismic activity rare and weak; large icebergs may calve from ice shelf |
| Antigua and Barbuda | hurricanes and tropical storms (July to October); periodic droughts |
| Arctic Ocean | ice islands occasionally break away from northern Ellesmere Island; icebergs calved from glaciers in western Greenland and extreme northeastern Canada; permafrost in islands; virtually ice locked from October to June; ships subject to superstructure icing from October to May |
| Argentina | San Miguel de Tucuman and Mendoza areas in the Andes subject to earthquakes; pamperos are violent windstorms that can strike the pampas and northeast; heavy flooding in some areas
volcanism: Argentina experiences volcanic activity in the Andes Mountains along the Chilean border; Copahue (elev. 2,997 m) last erupted in 2000; other historically active volcanoes include Llullaillaco, Maipo, Planchon-Peteroa, San Jose, Tromen, Tupungatito, and Viedma |
| Armenia | occasionally severe earthquakes; droughts |
| Aruba | hurricanes; lies outside the Caribbean hurricane belt and is rarely threatened |
| Ashmore and Cartier Islands | surrounded by shoals and reefs that can pose maritime hazards |
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