| Country | Independence |
| Iran | 1 April 1979 (Islamic Republic of Iran proclaimed) |
| 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-controlled 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) |
| Italy | 17 March 1861 (Kingdom of Italy proclaimed; Italy was not finally unified until 1870) |
| Jamaica | 6 August 1962 (from the UK) |
| Jan Mayen | void |
| Japan | 660 B.C. (traditional date of the founding of the nation by Emperor JIMMU; first recognized by Emperor Meiji in 1873) |
| Jersey | none (British crown dependency) |
| Jordan | 25 May 1946 (from League of Nations mandate under British administration) |
| Kazakhstan | 16 December 1991 (from the Soviet Union) |
| Kenya | 12 December 1963 (from the UK) |
| Kiribati | 12 July 1979 (from the UK) |
| Korea, North | 15 August 1945 (from Japan) |
| Korea, South | 15 August 1945 (from Japan) |
| Kosovo | 17 February 2008 (from Serbia) |
| Kuwait | 19 June 1961 (from the UK) |
| Kyrgyzstan | 31 August 1991 (from the Soviet Union) |
| Laos | 19 July 1949 (from France) |
| Latvia | 18 November 1918 (from the Soviet Russia) |