| Country | Independence |
| Haiti | 1 January 1804 (from France) |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) | 11 February 1929 (from Italy); note - the three treaties signed with Italy on 11 February 1929 acknowledged, among other things, the full sovereignty of the Vatican and established its territorial extent; however, the origin of the Papal States, which over centuries varied considerably in extent, may be traced back to 754 |
| Honduras | 15 September 1821 (from Spain) |
| Hong Kong | none (special administrative region of China) |
| Hungary | 16 November 1918 (republic proclaimed); notable earlier dates: 25 December 1000 (crowning of King STEPHEN I, traditional founding date); 30 March 1867 (Austro-Hungarian dual monarchy established) |
| Iceland | 1 December 1918 (became a sovereign state under the Danish Crown); 17 June 1944 (from Denmark) |
| India | 15 August 1947 (from the UK) |
| Indian Ocean | void |
| Indonesia | 17 August 1945 (declared); 27 December 1949 (recognized by the Netherlands); note - in August 2005 the Netherlands announced that it had recognized de facto Indonesian independence on 17 August 1945 |
| Iran | 1 April 1979 (Islamic Republic of Iran proclaimed); notable earlier dates: ca. 625 B.C. (unification of Iran under the Medes); ca. A.D. 1501 (Iran reunified under the Safavids); 12 December 1925 (modern Iran established under the Pahlavis) |
| Iraq | 3 October 1932 (from League of Nations mandate under British administration); note - on 28 June 2004 the Coalition Provisional Authority transferred sovereignty to the Iraqi Interim Government |
| Ireland | 6 December 1921 (from the UK by treaty) |
| Isle of Man | none (British crown dependency) |
| Israel | 14 May 1948 (from League of Nations mandate under British administration) |
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