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- I Corps (Grande Armée)The I Corps of the Grande Armée was a French military unit that existed during the Napoleo
- Ich bin ein Berliner1963 speech by U.S. President John F. Kennedy in West Berlin
- Idel-Ural State1918 Tatar republic in Kazan and Ufa, Russia
- Ideological repression in the Soviet UnionIdeological repression in the Soviet Union targeted various worldviews and the correspondi
- Ideology of the Communist Party of the Soviet UnionManifestation of Marxism–Leninism
- IdionymonPolitical crime in Greece from 1929 to 1974
- Ignác GyulayCount Ignác Gyulay de Marosnémeti et Nádaska, Ignácz Gyulay, Ignaz Gyulai (11 September 17
- II Cavalry Corps (Grande Armée)The II Cavalry Corps of the Grande Armée was a French military unit that existed during th
- III Corps (Grande Armée)The III Corps of the Grande Armée was a French military unit that existed during the Napol
- III Corps (Ottoman Empire)The III Corps of the Ottoman Empire (Turkish: 3üncü Kolordu or Üçüncü Kolordu) was one of
- Illinois Central shopmen's strike of 1911The Illinois Central shopmen's strike of 1911 was a labor action in the United States of a
- ILP ContingentThe British Independent Labour Party sent a small contingent to fight in the Spanish Civil
- Immigration Act of 1882The Immigration Act of 1882 was a United States federal law signed by President Chester A.
- Imperial crest of JapanThe Imperial crest of Japan, most commonly known in English and Japanese as the chrysanthe
- Imperial decree of declaration of war against foreign powersThe Imperial Decree of declaration of war against foreign powers (Chinese: 宣戰詔書) was a sim
- Imperial Edict of the Abdication of the Qing EmperorDecree ending imperial rule in China
- Imperial German ArmyLand warfare branch of the German Empire
- Imperial House of France (First French Empire)The Imperial House of France during the First French Empire was the family of Napoleon, in
- Imperial Japanese ArmyPrincipal ground force of the Empire of Japan
- Imperial Japanese NavyNavy of Japan between 1868 and 1945
- Imperial Rescript on Education1890 edict in the Empire of Japan
- Imperial Rule Assistance Political AssociationThe Imperial Rule Assistance Political Association (翼賛政治会, Yokusan seijikai), abbreviated
- Imperial Russian NavyNavy of Tsarist Russia from 1696 to 1917
- Imperial Subject Public Service AssociationOrganization founded in Taiwan in 1941
- Imperial Way Faction1920s–1930s faction of the Japanese Army
- Incorporation of Xinjiang into the People's Republic of ChinaThe incorporation of Xinjiang into the People's Republic of China, known in Chinese histor
- Indefinite detentionIncarceration without a trial
- Independence of BrazilFounding of independent Brazil
- Independence of FinlandSeparation from Russia, ending in 1917
- Independent Operational Group PolesieIndependent Operational Group Polesie (Samodzielna Grupa Operacyjna Polesie, SGO Polesie)
- Independent State of Croatia1941–1945 puppet state of Germany and Italy
- India OfficeBritish government department in London (established 1858)
- Indian independence movementMovement to end British rule in India
- Indian Ocean in World War IINaval theatre of operations
- Indian Rebellion of 1857Uprising against British Company rule
- Indian Removal ActLaw authorizing the removal of Native Americans from US states
- Indian South AfricansCommunity of South Africans of Indian descent
- Indian TerritoryHistoric sovereign territory set aside for Native American nations, 1834–1907
- Indiana White CapsWhite caps were groups involved in the whitecapping movement who were operating in souther
- Indigenous members of the Andrew Jackson householdAndrew Jackson, the seventh president of the United States, and his wife Rachel Donelson R
- Indochina warsWars in Southeast Asia from 1945 to 1991
- Indonesian National AwakeningHistorical nationalist movement and time period
- Indonesian National Revolution1945–1949 Indonesian conflict and diplomatic struggle against Dutch rule
- Inequality in post-apartheid South AfricaSouth Africa is one of the world's most unequal countries due to the legacy of colonial an
- Infamous DecreeDecree issued by Napoleon
- Infiltration tacticsIn warfare, infiltration tactics involve small independent light infantry forces advancing
- Inoue TetsujirōJapanese philosopher, poet and educator
- Institut d'ÉgypteResearch center in Egypt
- Institute for Information on the Crimes of CommunismThe Institute for Information on the Crimes of Communism (IICC) (Swedish: Upplysning om ko
- Insular Government of the Philippine Islands1902–1935 US territory of the Philippines
- Intendancy of ChuquisacaThe Intendancy of Chuquisaca, also of Charcas or of La Plata, was an administrative area t
- Intercolonial RailwayThe Intercolonial Railway of Canada (reporting mark IRC), also referred to as the Intercol
- Intercommunal conflict in Mandatory Palestine1920–1948 conflict between Arabs and Jews in Palestine
- International Anticommunist EntenteThe International Anticommunist Entente (French: Entente Internationale Anticommuniste EIA
- International BrigadesParamilitary supporting the Republicans in the Spanish Civil War
- International Committee for the Nanking Safety ZoneThe International Committee was established in 1937 to establish and manage the Nanking Sa
- International Organization of JournalistsSoviet-era press organisation
- International Socialist CommissionThe International Socialist Commission, also known as the International Socialist Committe
- International Union of StudentsWorld non-partisan forum
- Internet-nationalismNationalism expressed through digital platforms
- InternmentImprisonment or confinement of groups of people without trial
- Internment of Japanese AmericansMass incarceration in the U.S. during WWII
- Internment of the Greek IV Corps at GörlitzBetween 1916 and 1919, 464 officers and 6373 soldiers of the Greek Army's IV Army Corps we
- Interwar period1918–1939 period between the world wars
- Invasion of Algiers (1830)1830 campaign of the French conquest of Algeria
- Invasion of Darfur (1916)1916 Anglo-Egyptian military operation during WWI
- Invasion of Lingayen Gulf1945 Allied operation in the Philippines during World War II
- Invasion of PolandInvasion at the beginning of World War II
- Invasion of the Cape Colony1795 invasion of the War of the First Coalition
- Invasion of the Spice IslandsThe invasion of the Spice Islands was a military invasion by British forces that took plac
- Invasion of the Waikato1863–64 campaign of the New Zealand Wars
- Invasion of Trentino (1866)Military operations during the wars of Italian Unification
- Invasion of Yugoslavia1941 Axis campaign during World War II
- Iquicha War of 1839The Iquicha War of 1839 was a brief armed conflict during and after the War of the Confede
- Iran–Iraq War1980–1988 armed conflict in West Asia
- Iranian RevolutionRevolution in Iran from 1978 to 1979
- Iraq War2003–2011 conflict in Iraq
- Iraqi conflictSeries of related conflicts since the 2003 invasion of Iraq
- Iraqi insurgency (2003–2011)Sectarian and anti-government warfare in American-occupied Iraq
- Iraqi insurgency (2011–2013)2011–13 sectarian violence in Iraq following the US invasion and withdrawal
- Iraqi insurgency (2017–present)Ongoing low-scale insurgency in Iraq
- Iraqi no-fly zones conflictNo-fly zones in Iraq proclaimed by the USA, UK and France between 1991–2003
- Iraqi strikes on Saudi Arabia1991 Iraqi military operations targeting American bases
- Iraqi–Kurdish conflictSeries of wars and rebellions by ethnic Kurds against successive Iraqi administrations
- Irish Civil War1922–1923 conflict between factions of the IRA
- Irish Free StateBritish dominion in Europe from 1922 to 1937
- Irish Republican ArmyParamilitary organisations in Ireland
- Irish Republican Army and the Anglo-Irish TreatyThe Irish Republican Army was a guerrilla army that fought the Irish War of Independence a
- Irish republicanismPolitical movement seeking independence in Ireland
- Irish revolutionary period1910s and 1920s in Ireland
- Irish War of Independence1919–1921 war between Irish and British forces
- Iron CurtainPolitical boundary dividing Europe during the Cold War
- Iron FrontGerman paramilitary organization
- Ironclad warshipSteam-propelled warship protected by armor plates
- IrredentismTerritorial claim
- Ismail CountyIsmail County was a county (județ) of Romania between 1925 and 1938 and between 1941 and 1
- Israeli–Palestinian conflictOngoing military and political conflict in West Asia
- IstriotRomance language spoken in Croatia
- Istro-Romanian languageRomance language of the Balkans
- ISU-122The ISU-122 (acronym of Istrebitelnaja - or Iosif Stalin-based - Samokhodnaya Ustanovka 12
- Italian campaign (World War II)1943–1945 military campaign in mainland Italy
- Italian Cyrenaica1911–1934 Italian possession in North Africa
- Italian EmpireColonial empire based in Italy (1882-1943)
- Italian Eritrea1882–1936 Former Italian protectorate in modern Eritrea
- Italian front (World War I)Italian theatre of World War I
- Italian guerrilla war in Ethiopia1941–1943 theatre of World War II
- Italian imperialism under fascismAspect of politics in Fascist Italy
- Italian invasion of Albania1939 pre-WWII Italian invasion of Albania
- Italian invasion of FranceItalian engagement of World War II
- Italian irredentismItalian political movement
- Italian Libya1934–1943 Italian colony in North Africa
- Italian liraCurrency of Italy from 1861 to 2002
- Italian partisan brigadesThe Italian partisan brigades were armed formations involved in the Italian resistance dur
- Italian resistance movementItalian combatant organizations opposed to Nazi-Fascism
- Italian Tripolitania1911–1934 Italian possession in North Africa
- Italo-Ethiopian War of 1887–18891887–1889 conflict with Ethiopia during the Italian colonization of East Africa
- Italo-German protocol of 23 October 19361936 treaty between Italy and Germany
- Italo-Soviet PactBilateral treaty between the Soviet Union and the Kingdom of Italy
- Italo-Turkish War1911–1912 war in Libya and the Aegean Sea
- Itata incidentThe Itata incident was a diplomatic affair and military incident involving the United Stat
- IV Cavalry Corps (Grande Armée)The IV Cavalry Corps of the Grande Armée was a French military unit that existed during th
- IV Corps (Grande Armée)The IV Corps of the Grande Armée was a French military unit that existed during the Napole
- IwiLargest social unit in traditional Māori culture
- Izzat Ibrahim al-Douri6th Vice president of Iraq