| Rank | Country | Maritime claims |
| Heard Island and McDonald Islands | territorial sea: 12 nm exclusive fishing zone: 200 nm |
| Holy See (Vatican City) | none (landlocked) |
| Honduras | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: natural extension of territory or to 200 nm |
| Hong Kong | territorial sea: 3 nm |
| Hungary | none (landlocked) |
| Iceland | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 nm or to the edge of the continental margin |
| India | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 nm or to the edge of the continental margin |
| Indian Ocean | void |
| Indonesia | measured from claimed archipelagic straight baselines territorial sea: 12 nm exclusive economic zone: 200 nm |
| Iran | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: bilateral agreements or median lines in the Persian Gulf continental shelf: natural prolongation |
| Iraq | territorial sea: 12 nm continental shelf: not specified |
| Ireland | territorial sea: 12 nm exclusive fishing zone: 200 nm |
| Isle of Man | territorial sea: 12 nm exclusive fishing zone: 12 nm |
| Israel | territorial sea: 12 nm continental shelf: to depth of exploitation |