| Country | National holiday |
| Greece | Independence Day, 25 March (1821) |
| Greenland | June 21 (longest day) |
| Grenada | Independence Day, 7 February (1974) |
| Guam | Discovery Day, first Monday in March (1521) |
| Guatemala | Independence Day, 15 September (1821) |
| Guernsey | Liberation Day, 9 May (1945) |
| Guinea | Independence Day, 2 October (1958) |
| Guinea-Bissau | Independence Day, 24 September (1973) |
| Guyana | Republic Day, 23 February (1970) |
| Haiti | Independence Day, 1 January (1804) |
| Heard Island and McDonald Islands | void |
| Holy See (Vatican City) | Election Day of Pope BENEDICT XVI, 19 April (2005) |
| Honduras | Independence Day, 15 September (1821) |
| Hong Kong | National Day (Anniversary of the Founding of the People's Republic of China), 1 October (1949); note - 1 July 1997 is celebrated as Hong Kong Special Administrative Region Establishment Day |
| Hungary | Saint Stephen's Day, 20 August |
| Iceland | Independence Day, 17 June (1944) |
| India | Republic Day, 26 January (1950) |
| Indian Ocean | void |
| Indonesia | Independence Day, 17 August (1945) |
| Iran | Republic Day, 1 April (1979) |
| Iraq | Republic Day, July 14 (1958); note - the Government of Iraq has yet to declare an official national holiday but still observes Republic Day |
| Ireland | Saint Patrick's Day, 17 March |
| Isle of Man | Tynwald Day, 5 July |
| Israel | Independence Day, 14 May (1948); note - Israel declared independence on 14 May 1948, but the Jewish calendar is lunar and the holiday may occur in April or May |
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