| 1/1 | January 19901990年1月 | Unknown | | Q12364951 |
| 1/1 | Vienna New Year's Concert 1990ウィーンフィル・ニューイヤーコンサート1990 | Unknown | | Q12744697 |
| 1/1 | Deaths in January 1990訃報 1990年1月 | Unknown | | Q23680482 |
| 1/1 | 1989–90 Four Hills Tournament | Unknown | | Q604402 |
| 1/1 | 1990 Rossija Tournament | Russia | | Q14852911 |
| 1/1 | Narsaq massacre | Unknown | Place: Narsaq | Q30323816 |
| 1/1 | 1989 Emperor's Cup FinalJapan第69回天皇杯全日本サッカー選手権大会・決勝 | Japan | Place: Tokyo | Q54817709 |
| 1/4 | Sukkur rail disasterサッカル鉄道事故 | Pakistan | | Q4242644 |
| 1/4 | Northwest Airlines Flight 5ノースウエスト航空5便エンジン脱落事故 | United States | | Q7059922 |
| 1/6 | 1st Golden Melody Awards第1回金曲奨 | Taiwan | Place: National Dr. Sun Yat-sen Memorial Hall | Q15898031 |
| 1/6 | Sausage Revolution | Unknown | Place: Chernihiv | Q16701891 |
| 1/7 | 1990 Turkmen Supreme Soviet election | Soviet Union, Turkmenistan | | Q7855449 |
| 1/8 | 7th AVN Awards | United States | Place: Tropicana Las Vegas | Q30634025 |
| 1/13 | Aeroflot Flight 6246 | Russia | | Q16662587 |
| 1/14 | Flying nightclub fire | Spain | | Q97177362 |
| 1/20 | Black January黒い一月事件 | Azerbaijan Soviet Socialist Republic | Place: Baku | Q734004 |
| 1/20 | 47th Golden Globe Awards第47回ゴールデングローブ賞 | Unknown | Place: The Beverly Hilton | Q1534967 |
| 1/20 | Spellemannprisen 1989 | Norway | Place: Olavshallen Concert Hall | Q12002233 |
| 1/21 | 16th Saturn Awards第16回サターン賞 | United States | Place: California | Q2226411 |
| 1/21 | 41st National Hockey League All-Star Game | United States | Place: Civic Arena | Q232334 |
| 1/21 | 1990 Gawkadal massacre | India | Place: Srinagar | Q5528422 |
| 1/21 | 1990 Colombian parliamentary election | Colombia | | Q5147962 |
| 1/25 | Avianca Flight 052アビアンカ航空52便墜落事故 | United States | Place: Cove Neck | Q783193 |
| 1/25 | Burns' Day storm | Unknown | | Q1380763 |
| 1/25 | Handwara massacre | India | | Q5647695 |
| 1/26 | solar eclipse of January 26, 19901990年1月26日の日食 | Unknown | | Q1146490 |
| 1/28 | 1990 Saarland state election | Germany | | Q1804035 |
| 1/28 | Transnistrian referendum, 1989–1990 | Transnistria | Place: Transnistria | Q4393805 |
| 1/31 | 1990 State of the Union Address | United States | | Q4586303 |
| 2/1 | February 19901990年2月 | Unknown | | Q3092767 |
| 2/1 | Deaths in February 1990訃報 1990年2月 | Unknown | | Q23680484 |
| 2/1 | 1990 Copa del Rey de Baloncesto | Spain | Place: Las Palmas de Gran Canaria | Q19302769 |
| 2/1 | Sovereign National Conference (Benin) | Benin | Place: Cotonou | Q18642519 |
| 2/1 | Il-76 crash in Panavėžys | Unknown | | Q19910592 |
| 2/2 | Rüsselsheim train disaster | Germany | Place: Rüsselsheim am Main | Q1312434 |
| 2/3 | 1990 24 Hours of Daytona | United States | Place: Daytona International Speedway | Q104778253 |
| 2/4 | 1990 Cairo bus attack | Egypt | | Q12410553 |
| 2/4 | 1990 Costa Rican general election | Costa Rica | | Q5174928 |
| 2/5 | disappearance of Ames Glover | United Kingdom | Place: London | Q17007350 |
| 2/5 | 25th Guldbagge Awards | Unknown | Place: Berns Salonger | Q17007681 |
| 2/5 | February 5, 19901990年2月5日 | Unknown | | Q69298388 |
| 2/6 | 1990 Grand Prix La Marseillaise | France | | Q30346801 |
| 2/6 | 1989 Antena de Oro | Spain | | Q6343010 |
| 2/6 | Palauan Compact of Free Association referendum, 1990 | Palau | | Q7126877 |
| 2/9 | New Zealand 1990 Commemoration Medal | New Zealand | | Q16933211 |
| 2/9 | February 1990 lunar eclipse1990年2月9日の月食 | Unknown | | Q5439772 |
| 2/11 | 1990 South American Cross Country Championships | Venezuela | Place: Caracas | Q16823411 |
| 2/11 | 1990 British Army Gazelle shootdown | Unknown | | Q16257126 |
| 2/12 | 1990 Manipur Legislative Assembly election | India | | Q110095371 |
| 2/14 | Indian Airlines Flight 605インディアン航空605便墜落事故 | India | Place: Bengaluru | Q6019809 |
| 2/18 | 1990 Japanese general electionJapan第39回衆議院議員総選挙 | Japan | | Q658649 |
| 2/18 | 1990 Daytona 5001990年のデイトナ500 | United States | Place: Daytona International Speedway | Q4585925 |
| 2/18 | 1990 Uzbek Supreme Soviet election | Soviet Union, Uzbekistan | | Q7904722 |
| 2/20 | February 20, 19901990年2月20日 | Unknown | | Q69298405 |
| 2/20 | 1990 Canadian federal budget | Canada | | Q85845059 |
| 2/21 | Address by Václav Havel in the United States Congress | Czech Republic, Czechoslovakia | Place: United States Capitol | Q19530758 |
| 2/24 | 1990 Lithuanian Supreme Soviet election1990年リトアニア最高会議選挙 | Soviet Union, Lithuania | | Q23074 |
| 2/25 | 1990 Tajik Supreme Soviet election | Soviet Union, Tajikistan | | Q7676838 |
| 2/25 | 1990 Kirghiz Supreme Soviet election | Soviet Union, Kyrgyzstan | | Q6452425 |
| 2/25 | 1990 Nicaraguan general election | Nicaragua | | Q7024485 |
| 2/25 | WrestleWar | United States | | Q21189153 |
| 2/27 | 1990 Himachal Pradesh Legislative Assembly election | India | | Q5764899 |
| 2/27 | 1990 Pondicherry Legislative Assembly election | India | | Q114120314 |
| 2/27 | 1990 Rajasthan Legislative Assembly election | Unknown | | Q107365950 |
| 2/27 | 1990 Madhya Pradesh Legislative Assembly election | India | | Q55621683 |
| 2/27 | 1990 Odisha Legislative Assembly election | India | | Q61605247 |
| 2/28 | 1990 Kuala Lumpur-Karak Highway Crash | Malaysia | | Q4586086 |
| 3/1 | ethnic clashes of Târgu Mureș | Romania | Place: Târgu Mureș | Q527130 |
| 3/1 | March 19901990年3月 | Unknown | | Q3294924 |
| 3/1 | Deaths in March 1990訃報 1990年3月 | Unknown | | Q23680486 |
| 3/1 | 1990 Zakoora and Tengpora massacre | India | Place: Srinagar | Q8065137 |
| 3/1 | 43rd Bodil Awards | Denmark | | Q16959328 |
| 3/1 | 1990 NCAA Division I Wrestling Championships | Unknown | | Q86684269 |
| 3/2 | Miss USA 1990ミスUSA1990 | United States | | Q6877720 |
| 3/3 | 1990 Omloop Het Volk | Belgium | | Q54430599 |
| 3/4 | 1990 Russian Supreme Soviet election1990年のロシア議会選挙 | Soviet Union, Russia | | Q2044515 |
| 3/4 | 15th César Awards第15回セザール賞 | France | Place: Théâtre des Champs-Élysées | Q900505 |
| 3/4 | 1990 Ukrainian Supreme Soviet election1990年ウクライナ最高議会選挙 | Soviet Union | | Q3824117 |
| 3/4 | 1990 Togolese parliamentary election | Togo | | Q7813217 |
| 3/4 | 1990 Ukrainian local elections | Soviet Union, Ukraine | | Q107339047 |
| 3/4 | 1990 Comorian presidential election | Comoros | | Q3586529 |
| 3/6 | 1990 Afghan coup attempt | Afghanistan | | Q48815391 |
| 3/10 | 4th Goya Awards第4回ゴヤ賞 | Spain | Place: Palacio de Congresos | Q354199 |
| 3/10 | 42nd Directors Guild of America Awards第42回全米監督協会賞 | United States | Place: The Beverly Hilton | Q55602814 |
| 3/10 | Festival RTP da Canção 1990 | Portugal | Place: Casino Estoril | Q10281926 |
| 3/10 | speed skating at the 1990 Asian Winter Games – men's 5000 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641818 |
| 3/10 | speed skating at the 1990 Asian Winter Games – men's 500 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641819 |
| 3/10 | speed skating at the 1990 Asian Winter Games – women's 500 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641825 |
| 3/10 | March 10, 19901990年3月10日 | Unknown | | Q69298425 |
| 3/11 | Act of the Re-Establishment of the State of Lithuaniaリトアニア国家再建法 | Lithuania | | Q2823577 |
| 3/11 | 43rd British Academy Film Awards第43回英国アカデミー賞 | United Kingdom | Place: SEC Centre | Q2089781 |
| 3/11 | 16th People's Choice Awards | United States | Place: Universal Studios Hollywood | Q4552215 |
| 3/11 | speed skating at the 1990 Asian Winter Games – men's 1500 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641817 |
| 3/11 | speed skating at the 1990 Asian Winter Games – women's 1500 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641823 |
| 3/11 | 1990 500 km of FujiJapan | Japan | Place: Oyama | Q92159257 |
| 3/12 | speed skating at the 1990 Asian Winter Games – men's 1000 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641816 |
| 3/12 | speed skating at the 1990 Asian Winter Games – women's 1000 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641821 |
| 3/12 | speed skating at the 1990 Asian Winter Games – women's 3000 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641824 |
| 3/13 | 1990 Grenadian general election1990年グレナダ議会総選挙 | Grenada | | Q5607421 |
| 3/13 | speed skating at the 1990 Asian Winter Games – men's 10000 metresJapan | Japan | Place: Makomanai Open Stadium | Q55641815 |
| 3/14 | 1990 Soviet Union presidential election1990年ソビエト連邦大統領選挙 | Soviet Union | | Q53878047 |
| 3/15 | Fernando Collor 1990 presidential inauguration | Brazil | | Q117840939 |
| 3/17 | March 17, 19901990年3月17日 | Unknown | | Q69298432 |
| 3/18 | 1990 East German general electionドイツ民主共和国人民議会1990年選挙 | East Germany | | Q561886 |
| 3/18 | 1990 Latvian Supreme Soviet election | Soviet Union, Lithuanian Soviet Socialist Republic | | Q133770 |
| 3/18 | 1990 Estonian Supreme Soviet election1990年エストニア最高会議選挙 | Estonian Soviet Socialist Republic, Soviet Union | | Q3740797 |
| 3/20 | 11th Genie Awards第11回ジニー賞 | Canada | Place: Metro Toronto Convention Centre | Q2807146 |
| 3/21 | Isabella Stewart Gardner Museum theft | United States | Place: Isabella Stewart Gardner Museum | Q19880899 |
| 3/21 | 1990 Taiwan presidential election1990年中華民国総統選挙 | Taiwan | Place: Chung-Shan Building | Q10844051 |
| 3/22 | Kosovo student poisoning | Kosovo | Place: Kosovo | Q6433374 |
| 3/22 | 1990 Dwars door Vlaanderen | Belgium | | Q22981529 |
| 3/23 | 1990 Zimbabwean general election | Zimbabwe | | Q8072084 |
| 3/24 | 5th Independent Spirit Awards第5回インディペンデント・スピリット賞 | United States | Place: Hollywood Roosevelt Hotel | Q1436131 |
| 3/24 | 1990 Australian federal election | Australia | | Q239888 |
| 3/24 | Melodi Grand Prix 1990 | Norway | Place: Clarion Hotel The Hub | Q107599958 |
| 3/24 | 1990 E3 Harelbeke | Belgium | | Q29867646 |
| 3/24 | 1990 Uzbek presidential election | Soviet Union | | Q85865032 |
| 3/25 | 10th Golden Raspberry Awards第10回ゴールデンラズベリー賞 | United States | Place: Hollywood Roosevelt Hotel | Q1299193 |
| 3/25 | 1990 Hungarian parliamentary election1990年ハンガリー議会選挙 | Hungary | | Q636414 |
| 3/25 | Happy Land fireハッピーランド放火事件 | United States | Place: West Farms | Q5652893 |
| 3/25 | 1990 Kazakh Supreme Soviet election | Soviet Union, Kazakhstan | | Q3788154 |
| 3/25 | 1990 Czech Social Democratic Party leadership election | Czechoslovakia | | Q30593805 |
| 3/25 | 1990 Brabantse Pijl | Belgium | | Q55601367 |
| 3/26 | 62nd Academy Awards第62回アカデミー賞 | Unknown | Place: Dorothy Chandler Pavilion | Q910864 |
| 3/28 | March 28, 19901990年3月28日 | Unknown | | Q21684799 |
| 3/31 | Poll Tax Riots人頭税暴動 | Unknown | | Q7225532 |
| 4/1 | 1990 United States Census1990年アメリカ合衆国国勢調査 | United States | Place: United States | Q862577 |
| 4/1 | April 19901990年4月 | Unknown | | Q2874568 |
| 4/1 | Baren Township conflictバリン郷事件 | Unknown | Place: Akto County | Q4860423 |
| 4/1 | World War III | Germany | | Q1193030 |
| 4/1 | Deaths in April 1990訃報 1990年4月 | Unknown | | Q23680487 |
| 4/1 | DHKP/C insurgency in TurkeyトルコでのDHKP/Cの反乱 | Turkey | Place: Turkey | Q19892322 |
| 4/1 | 1990 Tournoi des As | France | Place: Tours | Q135426339 |
| 4/2 | 1990 Bishop's Castle earthquake | United Kingdom | | Q4585870 |
| 4/5 | 1990 Grand Prix de Denain | France | | Q21008457 |
| 4/5 | 21st GMA Dove Awards | United States | Place: Tennessee Performing Arts Center | Q4631104 |
| 4/7 | 1990 Kirghiz Supreme Soviet election | Soviet Union, Kyrgyzstan | | Q6452425 |
| 4/7 | 1990 Niuean general election | Niue | | Q7041684 |
| 4/8 | 1990 People's Movementジャナ・アンドラン | Nepal | | Q1783955 |
| 4/8 | 1990 Greek legislative election | Greece | | Q2532458 |
| 4/8 | 1990 Slovenian parliamentary election | Slovenia | | Q613779 |
| 4/8 | 1990 Peruvian general election1990年ペルー総選挙 | Peru | | Q2370880 |
| 4/8 | 9th Hong Kong Film Awards第9回香港電影金像奨 | British Hong Kong | Place: Hong Kong Academy for Performing Arts | Q986533 |
| 4/8 | 1990 Slovenian presidential election | Slovenia | | Q3722578 |
| 4/8 | murder of Iguchi Mariko台湾日本人女子大生殺人事件 | Taiwan | Place: Kaohsiung | Q10882430 |
| 4/9 | Atlantic Southeast Airlines Flight 2254アトランティック・サウスイースト航空2254便空中衝突事故 | United States | Place: Gadsden | Q4816543 |
| 4/11 | 1990 La Flèche Wallonneフレッシュ・ワロンヌ1990 | Belgium | | Q1915592 |
| 4/12 | Widerøe Flight 839ヴィデロー航空839便墜落事故 | Norway | Place: Værøy Municipality | Q7998696 |
| 4/12 | assassination of Nippon-hikouki Executive Director's wifeJapan日本飛行機専務宅放火殺人事件 | Japan | | Q11509437 |
| 4/14 | 25th Golden Bell Awards | Taiwan | Place: National Dr. Sun Yat-sen Memorial Hall | Q18118956 |
| 4/15 | Miss Universe 1990ミス・ユニバース1990 | Unknown | Place: Shubert Theatre | Q276809 |
| 4/16 | 1990 Boston Marathonボストン・マラソン1990 | United States | Place: Boston | Q2930507 |
| 4/17 | 1990 Scheldeprijs | Belgium | | Q48851000 |
| 4/17 | 1990 Paris–Camembert | France | | Q28747394 |
| 4/18 | April 18, 19901990年4月18日 | Unknown | | Q69298467 |
| 4/22 | 1990 Croatian parliamentary election | Socialist Republic of Croatia | | Q1286953 |
| 4/22 | 1990 North Korean parliamentary election第九期最高人民会議代議員選挙 | North Korea | | Q7055857 |
| 4/22 | 1990 London Marathonロンドン・マラソン1990 | United Kingdom | Place: London | Q1923865 |
| 4/22 | 1990 Nigerian coup d'état attempt | Nigeria | | Q85726324 |
| 4/22 | The Skilball Trophy | Unknown | Place: Twickenham Stadium | Q7764623 |
| 4/23 | 1990 Kids' Choice Awards | United States | Place: Candlestick Park | Q2335134 |
| 4/23 | 1990 Sudanese coup d'état attempt | Sudan | | Q81364127 |
| 4/24 | 1990 Kazakh presidential election | Kazakhstan | | Q104846359 |
| 4/24 | Pescopagano massacre | Italy | | Q3975737 |
| 4/29 | April 29, 19901990年4月29日 | Unknown | | Q42412041 |
| 4/30 | 1990 Scotland RAF Shackleton crash | Unknown | | Q87591817 |
| 5/1 | May 19901990年5月 | Unknown | | Q3277975 |
| 5/1 | deaths in May 1990訃報 1990年5月 | Unknown | | Q23680488 |
| 5/1 | murder of Susan Poupart | United States | | Q17009611 |
| 5/1 | Dislocation (festival) | Ukraine | Place: Lviv | Q12089187 |
| 5/1 | 1990 Pontins Professional | Wales | Place: プレスタティン | Q48798353 |
| 5/2 | 1990 Cupa României Final | Romania | Place: Stadionul Național | Q96366602 |
| 5/3 | 1990 Cheltenham Borough Council election | United Kingdom | | Q110269852 |
| 5/3 | 1990 London local elections | United Kingdom | | Q18160690 |
| 5/4 | 1990 Greek presidential election | Greece | | Q62032103 |
| 5/5 | 1990 1000 km of Fuji (Interchallenge)Japan | Japan | Place: Oyama | Q92161075 |
| 5/6 | Bridge of Flowers | Romania | Place: Romania | Q4304561 |
| 5/6 | 1990 Croatian parliamentary election | Socialist Republic of Croatia | | Q1286953 |
| 5/6 | 1990 Piedmontese regional election | Italy | | Q3722784 |
| 5/6 | 1990 Northern Cyprus parliamentary election | Northern Cyprus | | Q16958900 |
| 5/6 | 1990 Northern Cyprus presidential election1990年北キプロス大統領選挙 | Northern Cyprus | | Q16958915 |
| 5/6 | 1990 local elections in the German Democratic Republic | East Germany | | Q33473321 |
| 5/6 | Cowan rail accident | Australia | | Q5179457 |
| 5/9 | 1990 Moscow Victory Day Parade対ナチス・ドイツ戦勝45周年記念パレード | Soviet Union | Place: Red Square | Q4344817 |
| 5/11 | Philippine Airlines Flight 143フィリピン航空143便火災事故 | Philippines | Place: Ninoy Aquino International Airport | Q7184944 |
| 5/12 | 1990 Italian regional elections | Italy | | Q3722770 |
| 5/12 | 1990 Scottish Cup Final | United Kingdom | Place: Hampden Park | Q4586268 |
| 5/13 | Dinamo Zagreb–Red Star Belgrade riot1990年ディナモ・ザグレブ対レッドスター・ベオグラード戦での暴動 | Croatia | | Q2288824 |
| 5/13 | 1990 North Rhine-Westphalia state election | Germany | | Q1231451 |
| 5/13 | 1990 Lower Saxony state election | Germany | | Q1261937 |
| 5/16 | 1990 Dominican Republic general election | Dominican Republic | | Q5290795 |
| 5/17 | murder of Joanna Parrish | France | Place: Monéteau | Q6937914 |
| 5/17 | 1990 Katarina Church fire | Sweden | | Q10544314 |
| 5/18 | Aerolift Philippines Flight 75アエロリフト・フィリピン075便墜落事故 | Unknown | | Q104776647 |
| 5/19 | 1990 DFB-Pokal Final | Germany | Place: Berlin Olympic Stadium | Q28154358 |
| 5/20 | 1990 Romanian presidential election | Romania | | Q12720200 |
| 5/20 | 1990 Romanian parliamentary election | Romania | | Q3722388 |
| 5/20 | 1990 Armenian Supreme Soviet election | Soviet Union, Armenia | | Q4793282 |
| 5/20 | 1990 Romanian general election1990年ルーマニア総選挙 | Romania | | Q1702253 |
| 5/21 | Hawal massacre | India | Place: Hawal | Q64875988 |
| 5/22 | Yemeni unificationイエメン統一 | Yemen | | Q1139876 |
| 5/22 | 1990 Syrian parliamentary election | Syria | | Q12184139 |
| 5/24 | Grand Prix de Wallonie 1990 | Belgium | | Q20731464 |
| 5/24 | Disappearance of Paige Renkoski | United States | Place: Fowlerville | Q30636466 |
| 5/27 | 1990 Myanmar general election1990年ミャンマー総選挙 | Myanmar | | Q4999446 |
| 5/27 | 1990 Colombian presidential election | Colombia | | Q1637737 |
| 5/27 | Nick Spanos and Stephen Melrose | Unknown | | Q12012612 |
| 5/27 | 57th Tokyo YūshunJapan第57回東京優駿 | Japan | Place: Tokyo Racecourse | Q11601438 |
| 5/28 | 1990 Dominican general election | Dominica | | Q5290873 |
| 5/29 | May 29, 19901990年5月29日 | Unknown | | Q64892351 |
| 5/30 | 1990 Bantala rape case | Unknown | | Q16057111 |
| 5/30 | 1990 Vrancea earthquakes | Romania | | Q5942111 |
| 5/31 | R. v. Sparrow女王対スパロー | Canada | | Q7274319 |
| 6/1 | June 19901990年6月 | Unknown | | Q3188262 |
| 6/1 | Deaths in June 1990訃報 1990年6月 | Unknown | | Q23680489 |
| 6/1 | 1990 Tbilisi aerial tramway accidentトビリシロープウェイ事故 | Georgia | Place: Tbilisi | Q4586322 |
| 6/2 | 35th David di Donatello Awards第35回ダヴィッド・ディ・ドナテッロ賞 | Italy | Place: Teatro delle Vittorie | Q3703423 |
| 6/2 | 1990 Coupe de France Final | France | Place: Parc des Princes | Q4585919 |
| 6/2 | Markair Flight 3087 | Unknown | | Q67079812 |
| 6/3 | 1990 Armenian Supreme Soviet election | Soviet Union, Armenia | | Q4793282 |
| 6/3 | Joigny coach crash | France | Place: A6 autoroute | Q24290188 |
| 6/3 | 1990 Miller Genuine Draft 200 | United States | Place: Milwaukee Mile | Q10585422 |
| 6/3 | 1990 Taça de Portugal Final | Portugal | Place: Estádio Nacional | Q16851697 |
| 6/5 | 1990 Gullegem Koerse | Belgium | | Q115556935 |
| 6/8 | Slovak parliamentary election, 19901990年スロバキア共和国国民評議会選挙 | Slovakia | | Q2053294 |
| 6/8 | 1990 Czech legislative election1990年チェコ共和国国民評議会選挙 | Czech Republic, Czechoslovakia | | Q3277309 |
| 6/9 | Election to Sněmovna národů | Czechoslovakia | | Q11932121 |
| 6/10 | British Airways Flight 5390ブリティッシュ・エアウェイズ5390便不時着事故 | United Kingdom | Place: Didcot | Q435572 |
| 6/10 | 1990 Bulgarian Constitutional Assembly election1990年ブルガリア大国民議会選挙 | Bulgaria | | Q2641962 |
| 6/10 | 1990 Kuwaiti National Council election | Kuwait | | Q16938020 |
| 6/10 | 31st Takarazuka KinenJapan第31回宝塚記念 | Japan | Place: Hanshin Racecourse | Q11600873 |
| 6/10 | 1990 Banquet Frozen Foods 300 | United States | Place: Sonoma Raceway | Q4585855 |
| 6/11 | Twenty-fourth government of Israel第24次 | Israel | | Q7857747 |
| 6/11 | 1990 massacre of Sri Lankan Police officers | Sri Lanka | Place: Eastern Province | Q4586462 |
| 6/11 | Çevrimli massacre | Turkey | Place: Çevrimli | Q12812781 |
| 6/12 | Declaration of State Sovereignty of the Russian Soviet Federative Socialist Republic国家主権宣言 | Russia | Place: Moscow | Q4156971 |
| 6/12 | 1990 Algerian local elections | Algeria | | Q4724099 |
| 6/15 | Dublin Conventionダブリン規約 | Unknown | | Q910554 |
| 6/17 | 1990 Ecuadorian parliamentary election | Ecuador | | Q17009942 |
| 6/19 | Schengen Implementing Conventionシェンゲン協定 | Unknown | Place: Schengen | Q83356 |
| 6/20 | 1990 Manjil–Rudbar earthquake1990年マンジール・ルードバール地震 | Iran | Place: Rudbar County | Q603134 |
| 6/20 | Kalmunai massacre | Sri Lanka | Place: Eastern Province | Q6354106 |
| 6/22 | 1990 Mongolian legislative election | Mongolia | | Q2053571 |
| 6/23 | 1990 Andalusian regional election | Spain | | Q4753537 |
| 6/23 | 1990 Tongmen Village debris flow | Taiwan | | Q24840143 |
| 6/24 | 1990 FIFA World Cup Match 39 | Italy | Place: Stadio delle Alpi | Q97173108 |
| 6/25 | Foz de Lumbier incident | Spain | Place: Foz de Lumbier | Q920392 |
| 6/26 | Carlton Club bombing | United Kingdom | Place: Carlton Club | Q55099313 |
| 6/27 | 1990 NBA Draft1990年のNBAドラフト | United States | | Q1382286 |
| 6/30 | Aeroflot Flight 93 | Unknown | | Q16532379 |
| 7/1 | July 19901990年7月 | Unknown | | Q3188196 |
| 7/1 | Deaths in July 1990訃報 1990年7月 | Unknown | | Q23680490 |
| 7/1 | 1990 Swedish Open | Sweden | Place: Båstad Tennis Stadium | Q3978684 |
| 7/1 | 1990 Zambian coup d'état attempt | Zambia | Place: Lusaka | Q61974741 |
| 7/2 | 1990 Mecca tunnel tragedy1990年メッカ巡礼事故 | Saudi Arabia | Place: Mina | Q18409574 |
| 7/2 | Serbian constitutional referendum | Socialist Republic of Serbia | | Q16978264 |
| 7/3 | 1990 Moldavian Supreme Soviet election1990年モルドバ議会選挙 | Soviet Union | | Q3827128 |
| 7/3 | 1990 Maharashtra Legislative Assembly election | India | | Q17071095 |
| 7/3 | 1990 Bihar Legislative Assembly election | India | | Q4907060 |
| 7/3 | Operation Eagle | Unknown | Place: Jaffna | Q7097014 |
| 7/4 | July 4, 19901990年7月4日 | Unknown | | Q69298551 |
| 7/5 | 1990 Czechoslovak presidential election | Czechoslovakia | | Q48860934 |
| 7/6 | Nishi Door AccidentJapan神戸高塚高校校門圧死事件 | Japan | Place: Nishi-ku | Q11590257 |
| 7/7 | 1990 Belgian motorcycle Grand Prix | Belgium | | Q4585861 |
| 7/7 | The Great American Bash | United States | | Q30599839 |
| 7/11 | disappearance of Sarah MacDiarmid | Australia | | Q5281276 |
| 7/11 | Battle of Kokavil | Unknown | Place: Kokavil | Q4871469 |
| 7/15 | 1990 Armenian Supreme Soviet election | Soviet Union, Armenia | | Q4793282 |
| 7/16 | 1990 Luzon earthquakeバギオ大地震 | Philippines | | Q2885880 |
| 7/18 | 1990 Sabah state election | Malaysia | | Q17055416 |
| 7/20 | July 20, 19901990年7月20日 | Unknown | | Q54259314 |
| 7/22 | solar eclipse of July 22, 19901990年7月22日の日食 | Estonian Soviet Socialist Republic, Russian Socialist Federative Soviet Republic, United States, Finland | | Q1146513 |
| 7/22 | 1990 500 Miles of FujiJapan | Japan | Place: Oyama | Q92000915 |
| 7/27 | Declaration of State Sovereignty of the Belarusian Soviet Socialist Republic白ロシア・ソビエト社会主義共和国の国家主権に関する宣言 | Unknown | | Q2094010 |
| 7/29 | Monrovia Church massacre | Liberia | Place: Sinkor | Q1907399 |
| 7/29 | Hungarian presidential election referendum, 1990 | Hungary | | Q5943015 |
| 8/1 | Jamaat al Muslimeen coup attemptトリニダード・トバコの1990年クーデター未遂事件 | Trinidad and Tobago | Place: The Red House | Q6127215 |
| 8/1 | August 19901990年8月 | Unknown | | Q2858052 |
| 8/1 | Deaths in August 1990訃報 1990年8月 | Unknown | | Q23680491 |
| 8/1 | Aeroflot Flight 35 | Azerbaijan | | Q16662647 |
| 8/2 | British Airways Flight 149ブリティッシュエアウェイズ149便乗員拉致事件 | Unknown | Place: Kuwait International Airport | Q3296462 |
| 8/2 | Battle of Dasman Palace | Kuwait | Place: Kuwait | Q4870849 |
| 8/2 | Battle of the Bridges | Kuwait | Place: Kuwait | Q4872876 |
| 8/2 | Battle of Failaka | Kuwait | Place: Kuwait | Q4870995 |
| 8/3 | Kattankudy mosque massacreカッタンクディ・モスク虐殺事件 | Sri Lanka | Place: Kattankudy | Q3522435 |
| 8/3 | 1990 Hungarian presidential election1990年ハンガリー大統領選挙 | Hungary | | Q30633168 |
| 8/5 | 1990 British motorcycle Grand Prix | United Kingdom | | Q4585874 |
| 8/5 | 1990 Marlboro 500 | United States | Place: Michigan International Speedway | Q10583817 |
| 8/7 | murder of Simonetta Cesaroni | Italy | | Q3705061 |
| 8/7 | August 7, 19901990年8月7日 | Unknown | | Q67216492 |
| 8/8 | August 8, 19901990年8月8日 | Unknown | | Q30059935 |
| 8/10 | 1990 Arab League extraordinary summit | Egypt | Place: Cairo | Q135005388 |
| 8/11 | Außerordentlicher FDP-Bundesparteitag 1990 | Germany | Place: Hanover | Q24422321 |
| 8/12 | 1990 Swedish motorcycle Grand Prix | Sweden | | Q4586317 |
| 8/12 | 37th Filmfare Awards South第37回フィルムフェア賞 南インド映画部門 | India | | Q55602788 |
| 8/15 | Veeramunai massacres | Sri Lanka | | Q123125661 |
| 8/19 | 1990 Züri-Metzgete | Switzerland | | Q2593417 |
| 8/19 | Referendum on the autonomy of Serbs in Croatia | Socialist Republic of Croatia | | Q121640356 |
| 8/20 | Ursus rail crash | Poland | | Q11737188 |
| 8/21 | 1990 GP Ouest-FranceGP西フランス・プルエー1990 | France | | Q3775272 |
| 8/22 | São Tomé and Príncipe constitutional referendum, 1990 | São Tomé and Príncipe | | Q2515546 |
| 8/23 | Serbian parliamentary election, 1990 | Serbia | | Q21855612 |
| 8/25 | Rail accident near Spálov | Czechoslovakia | | Q10273951 |
| 8/25 | Amanda Award 1990 | Norway | Place: Haugesund Municipality | Q3910410 |
| 8/26 | 1990 Czechoslovak motorcycle Grand Prix | Czechoslovakia | | Q12797065 |
| 8/26 | Puerto Hurraco massacreプエルト・ウラコの虐殺 | Spain | Place: Puerto Hurraco | Q6005185 |
| 8/28 | August 28, 19901990年8月28日 | Unknown | | Q69298610 |
| 8/30 | The Declaration of the Tatar Soviet Socialist Republic State Sovereignty | Unknown | | Q19151463 |
| 8/30 | Ministry of Internal Affairs in the Republic of Tatarstan | Russia | | Q6867271 |
| 8/31 | Unification Treaty統一条約 | Unknown | Place: Kronprinzenpalais | Q451546 |
| 9/1 | Category:September 1990Category:1990年9月 | Unknown | | Q19758389 |
| 9/1 | September 19901990年9月 | Unknown | | Q3478980 |
| 9/1 | Category:September 1990 in sports | Unknown | | Q13348198 |
| 9/1 | Deaths in September 1990訃報 1990年9月 | Unknown | | Q23680492 |
| 9/1 | Category:September 1990 by country | Unknown | | Q81284393 |
| 9/1 | Category:September 1990 in Europe | Unknown | | Q30618376 |
| 9/1 | Category:September 1990 by continent | Unknown | | Q30618378 |
| 9/1 | Category:September 1990 in the United States | Unknown | | Q81284364 |
| 9/1 | Category:September 1990 in Asia | Unknown | | Q81350046 |
| 9/1 | Category:September 1990 in Australia | Unknown | | Q106071682 |
| 9/1 | Category:September 1990 in Italy | Unknown | | Q127427335 |
| 9/1 | Category:September 1990 in China | Unknown | | Q131327681 |
| 9/1 | Category:September 1990 in the Soviet Union | Unknown | | Q131327682 |
| 9/1 | Category:September 1990 in North America | Unknown | | Q81284384 |
| 9/1 | Category:September 1990 in Oceania | Unknown | | Q99646594 |
| 9/1 | Category:September 1990 sports events in Australia | Unknown | | Q106071681 |
| 9/1 | Category:September 1990 in France | Unknown | | Q126449588 |
| 9/1 | Category:September 1990 sports events in China | Unknown | | Q134568897 |
| 9/1 | Category:September 1990 sports events in Japan | Unknown | | Q134568898 |
| 9/1 | Category:September 1990 in Japan | Unknown | | Q134578044 |
| 9/1 | Category:September 1990 in Yugoslavia | Unknown | | Q136362745 |
| 9/1 | Category:September 1990 sports events in Europe | Unknown | | Q30618195 |
| 9/1 | September 1, 19901990年9月1日 | Unknown | | Q55599137 |
| 9/1 | Operation Sea Breeze | Unknown | Place: Mullaitivu | Q7097512 |
| 9/1 | Category:September 1990 sports events in the United States | Unknown | | Q81284354 |
| 9/1 | Category:September 1990 sports events in North America | Unknown | | Q81284375 |
| 9/1 | Category:September 1990 sports events in Asia | Unknown | | Q81350041 |
| 9/1 | Category:September 1990 sports events in South America | Unknown | | Q83607902 |
| 9/1 | Category:September 1990 in South America | Unknown | | Q83607909 |
| 9/1 | Category:September 1990 in Canada | Unknown | | Q86803140 |
| 9/1 | Category:September 1990 in the United Kingdom | Unknown | | Q86803143 |
| 9/1 | Category:September 1990 sports events in Oceania | Unknown | | Q99646593 |
| 9/4 | Evi Rauter | Spain | Place: Portbou | Q114604304 |
| 9/5 | Eastern University massacre | Sri Lanka | | Q5330553 |
| 9/6 | 1990 Ontario general election | Canada | | Q3586384 |
| 9/7 | 1990 Kampioenschap van Vlaanderen | Belgium | | Q45174900 |
| 9/9 | Helsinki Summit | Finland | | Q56294001 |
| 9/9 | 1990 Batticaloa massacre | Sri Lanka | Place: Batticaloa | Q4585858 |
| 9/11 | 1990 Faucett Perú 727 disappearance1990年フォーセット航空ボーイング727失踪事故 | Peru | | Q104776653 |
| 9/11 | 1990 Cartagena bombing | Spain | Place: former Civil Guard barracks in Calle de Ángel Bruna, Cartagena | Q55821577 |
| 9/11 | 1990 Manitoba general election | Canada | | Q6750212 |
| 9/12 | Treaty on the Final Settlement with Respect to Germanyドイツ最終規定条約 | Russia | Place: Moscow | Q159644 |
| 9/12 | Kinmen Agreement | Unknown | | Q55695682 |
| 9/12 | Faroe Islands v Austria (UEFA Euro 1992 qualifying) | Sweden | Place: Landskrona IP | Q1478344 |
| 9/13 | Operation Thrividha Balaya | Unknown | Place: Jaffna | Q7097628 |
| 9/14 | Aeroflot Flight 8175 | Unknown | Place: Russian Soviet Federative Socialist Republic | Q16662652 |
| 9/16 | 1990 Gabonese legislative election | Gabon | | Q5515457 |
| 9/16 | 1990 500 km of SugoJapan | Japan | Place: Murata | Q92159414 |
| 9/19 | 1990 Paris–Brussels | France, Belgium | | Q57778513 |
| 9/23 | 1990 Grote Prijs Jef Scherens | Belgium | | Q18613158 |
| 9/24 | 1990 Bangkok gas explosion | Thailand | | Q25055842 |
| 9/27 | Hankyu Airlines Flight 204Japan阪急航空チャーター機墜落事故 | Japan | | Q109600833 |
| 9/30 | 1990 Azerbaijani Supreme Soviet election | Soviet Union, Azerbaijan | | Q4832429 |
| 9/30 | 1990 Grand Prix des Amériques (cycling race) | Canada | | Q3775477 |
| 9/30 | 1990 Berlin Marathonベルリン・マラソン1990 | Germany | Place: Berlin | Q2054199 |
| 9/30 | 1990 Tyson Holly Farms 400 | United States | Place: North Wilkesboro Speedway | Q117839014 |
| 10/1 | October 19901990年10月 | Unknown | | Q3348939 |
| 10/1 | Deaths in October 1990訃報 1990年10月 | Unknown | | Q23680493 |
| 10/1 | March to Gagauzia | Moldova | | Q3920302 |
| 10/1 | 1990 Skate America1990年スケートアメリカ | United States | Place: Buffalo Memorial Auditorium | Q3486159 |
| 10/1 | 1990 Skate Canada International1990年スケートカナダ | Canada | Place: Lethbridge | Q3486184 |
| 10/2 | 1990 Guangzhou Baiyun airport collisions廈門航空機ハイジャック事件 | People's Republic of China | Place: Guangzhou Baiyun International Airport (1933–2004) | Q800043 |
| 10/3 | LOGSE | Spain | | Q3326778 |
| 10/3 | 1990 Brazilian legislative election | Brazil | | Q4958852 |
| 10/3 | integration of East Germany into the European Communities | Unknown | | Q17630511 |
| 10/4 | Operation Noroît | Rwanda | Place: Kigali | Q3354781 |
| 10/6 | 1990 AFL Grand Final | Australia | Place: Melbourne Cricket Ground | Q4585783 |
| 10/7 | 1990 Austrian legislative election1990年のオーストリア国政選挙 | Austria | | Q692081 |
| 10/7 | 1990 1000 km of Fuji (All Japan)Japan | Japan | Place: Oyama | Q92160177 |
| 10/8 | 1990 Temple Mount killings | Unknown | | Q2897036 |
| 10/8 | 1990 Iranian Assembly of Experts election | Iran | | Q15853369 |
| 10/10 | 1990 Bangladesh mass uprising1990年バングラデシュ民衆蜂起 | Bangladesh | Place: Dhaka | Q24950646 |
| 10/11 | Declaration of State Sovereignty of Bashkortostan | Unknown | | Q16642507 |
| 10/11 | Egyptian parliamentary dissolution referendum, 1990 | Egypt | | Q5348486 |
| 10/12 | 1990 Santiago de Compostela bombing | Spain | Place: A Ponte da Rocha | Q117187652 |
| 10/13 | Earth-grazing meteoroid of 13 October 1990 | Czechoslovakia | Place: Poland | Q19280175 |
| 10/13 | Dahr al-Wahsh massacre | Lebanon | | Q130303394 |
| 10/14 | 1990 Thuringian state election | Germany | | Q1685047 |
| 10/14 | 1990 Bavarian state election | Germany | | Q1804069 |
| 10/14 | 1990 Brandenburg state election | Germany | | Q1804074 |
| 10/14 | 1990 Azerbaijani Supreme Soviet election | Soviet Union, Azerbaijan | | Q4832429 |
| 10/14 | 1990 Mecklenburg-Vorpommern state election | Germany | | Q1654441 |
| 10/14 | 1990 Saxony-Anhalt state election | Germany | | Q1804171 |
| 10/14 | 1990 Saxony state election | Germany | | Q1804172 |
| 10/17 | Croatia v United States | Socialist Federal Republic of Yugoslavia | Place: Stadion Maksimir | Q5187081 |
| 10/20 | Old Trafford brawl | United Kingdom | Place: Old Trafford | Q15734077 |
| 10/21 | 1990 Malaysian general election | Malaysia | | Q6742053 |
| 10/21 | Liechtenstein tax referendum, 1990 | Liechtenstein | | Q6544042 |
| 10/21 | 1990 Norwegian Football Cup Final | Norway | Place: Ullevaal Stadion | Q60776587 |
| 10/24 | 1990 Pakistani general election | Pakistan | | Q3587223 |
| 10/24 | proxy bomb | Unknown | | Q7252892 |
| 10/25 | Buster Douglas vs. Evander Holyfield | United States | Place: The Mirage | Q16989010 |
| 10/27 | 1990 Turkmen presidential election | Soviet Union, Turkmenistan | | Q7855453 |
| 10/27 | Grand Prix de Lunel 1990 | France | | Q19810494 |
| 10/27 | 1990 New Zealand general election | New Zealand | | Q7016159 |
| 10/27 | 2nd Golden Melody Awards第2回金曲奨 | Taiwan | Place: National Dr. Sun Yat-sen Memorial Hall | Q15902022 |
| 10/27 | New Zealand parliamentary term referendum, 1990 | New Zealand | | Q7016293 |
| 10/28 | 1990 Georgian Supreme Soviet election | Soviet Union, Georgia | | Q3651327 |
| 10/28 | 1990 Basque regional election1990年バスク自治州議会選挙 | Spain | | Q3751723 |
| 10/28 | 1990 Tanzanian general election | Tanzania | | Q7684168 |
| 10/28 | 1990 German-speaking Community Parliament election | Belgium | | Q3587387 |
| 10/28 | 1990 Chicago Marathonシカゴ・マラソン1990 | United States | Place: Chicago | Q2316574 |
| 10/28 | 1990 Ivorian presidential election | Ivory Coast | | Q3586616 |
| 10/28 | 102nd Tenno ShoJapan第102回天皇賞 | Japan | Place: Tokyo Racecourse | Q137049328 |
| 10/28 | 1990 Scottish League Cup Final | Unknown | Place: Hampden Park | Q4484675 |
| 11/1 | November 19901990年11月 | Unknown | | Q3345438 |
| 11/1 | Deaths in November 1990訃報 1990年11月 | Unknown | | Q23680494 |
| 11/1 | 1990 Grand Prix International de Paris | France | Place: Accor Arena | Q130647 |
| 11/1 | 1990 NHK TrophyJapan1990年NHK杯国際フィギュアスケート競技大会 | Japan | Place: Asahikawa | Q248390 |
| 11/1 | 1990 Bangladesh anti-Hindu violence | Unknown | | Q4585854 |
| 11/1 | 1990 Nations Cup | Germany | Place: Gelsenkirchen | Q4586152 |
| 11/1 | 1990 Deutschland Cup | Germany | | Q104184825 |
| 11/1 | 8th Golden Eagle Awards | Unknown | Place: Nanjing | Q4645360 |
| 11/1 | 1990 United Nations Security Council election1990年国連安保理 非常任理事国選挙 | United Nations | | Q7888931 |
| 11/4 | 1990 New York City Marathonアメリカ合衆国、ニューヨークで開催したマラソン大会 | United States | Place: New York City | Q2189542 |
| 11/4 | 1990 Checker 500 | United States | Place: Phoenix Raceway | Q117839907 |
| 11/4 | 1990 Montreal municipal election | Canada | | Q6906370 |
| 11/4 | 1990 Quebec municipal elections | Canada | | Q7269831 |
| 11/5 | assassination of Meir Kahane | United States | Place: New York Marriott East Side | Q14706162 |
| 11/5 | 1990 Massachusetts gubernatorial election1990年マサチューセッツ州知事選挙 | United States | | Q6784434 |
| 11/6 | 1990 United States Senate elections1990年アメリカ合衆国上院議員選挙 | United States | | Q4348035 |
| 11/6 | 1990 United States Senate election in Delawareデラウェア州の1990年アメリカ合衆国上院議員選挙 | United States | | Q7891457 |
| 11/6 | 1990 United States House of Representatives elections1990年アメリカ合衆国下院議員選挙 | United States | | Q13256362 |
| 11/6 | 1990 United States Senate election in Tennesseeテネシー州の1990年アメリカ合衆国上院議員選挙 | United States | | Q16155935 |
| 11/6 | 1990 Connecticut gubernatorial election1990年コネチカット州知事選挙 | United States | | Q5161659 |
| 11/6 | 1990 United States Senate election in Rhode Islandロードアイランド州の1990年アメリカ合衆国上院議員選挙 | United States | | Q7891975 |
| 11/6 | Protocol 9 to the European Convention on Human Rights | Unknown | | Q11140106 |
| 11/6 | 1990 Arkansas gubernatorial election1990年アーカンソー州知事選挙 | United States | | Q16153879 |
| 11/6 | 1990 Hawaii gubernatorial election1990年ハワイ州知事選挙 | United States | | Q16153886 |
| 11/6 | 1990 Arizona gubernatorial election1990年アリゾナ州知事選挙 | United States | | Q16197811 |
| 11/6 | Alaska Measure 2 | United States | | Q19843050 |
| 11/6 | 1990 Washington, D.C. mayoral election | United States | | Q23132593 |
| 11/6 | 1990 New Mexico gubernatorial election1990年ニューメキシコ州知事選挙 | United States | | Q28221528 |
| 11/6 | 1990 Alaska gubernatorial election1990年アラスカ州知事選挙 | United States | | Q4708643 |
| 11/6 | 1990 California gubernatorial election1990年カリフォルニア州知事選挙 | United States | | Q5021258 |
| 11/6 | 1990 Florida gubernatorial election1990年フロリダ州知事選挙 | United States | | Q5461729 |
| 11/6 | 1990 Michigan gubernatorial election1990年ミシガン州知事選挙 | United States | | Q6837824 |
| 11/6 | 1990 Ohio gubernatorial election1990年オハイオ州知事選挙 | United States | | Q7081044 |
| 11/6 | 1990 Texas gubernatorial election1990年テキサス州知事選挙 | United States | | Q7708264 |
| 11/6 | 1990 United States Senate election in Massachusettsマサチューセッツ州の1990年アメリカ合衆国上院議員選挙 | United States | | Q7891630 |
| 11/6 | 1990 United States elections | United States | | Q7892451 |
| 11/7 | 1990 Irish presidential election | Ireland | | Q4376802 |
| 11/7 | attempted assassination of Mikhail Gorbachev | Soviet Union | Place: Red Square | Q135470340 |
| 11/7 | American Samoan gubernatorial veto referendum, 1990 | American Samoa | | Q4744907 |
| 11/8 | Convention on Laundering, Search, Seizure and Confiscation of the Proceeds from Crime | Unknown | Place: Strasbourg | Q18386143 |
| 11/11 | 1990 Macedonian parliamentary election | North Macedonia | | Q3408788 |
| 11/11 | 1990 Georgian Supreme Soviet election | Soviet Union, Georgia | | Q3651327 |
| 11/11 | 1990 Guatemalan general election | Guatemala | | Q5614285 |
| 11/13 | Niigata girl confinement incidentJapan新潟少女監禁事件 | Japan | Place: Sanjō-shi | Q99751424 |
| 11/14 | German–Polish Border Treatyドイツ・ポーランド国境条約 | Germany, Poland | Place: Warsaw | Q650979 |
| 11/14 | Alitalia Flight 404アリタリア航空404便墜落事故 | Switzerland | Place: Zurich | Q2647284 |
| 11/14 | Aramoana massacreアラモアナの虐殺 | New Zealand | Place: Aramoana | Q473868 |
| 11/14 | Battle of Mainzer Straßeマインツ通りの立ち退き | Germany | Place: Mainzer Straße | Q2178627 |
| 11/17 | 1990 Faroese general election | Denmark, Faroe Islands | | Q5436111 |
| 11/17 | Tu-154M crash | Czechoslovakia | | Q16532412 |
| 11/18 | 1990 Bosnian general election | Bosnia and Herzegovina | | Q2067054 |
| 11/18 | 1990 Okinawa gubernatorial electionJapan1990年沖縄県知事選挙 | Japan | | Q20038302 |
| 11/19 | Treaty on Conventional Armed Forces in Europeヨーロッパ通常戦力条約 | France | Place: Paris | Q834195 |
| 11/21 | Bangkok Airways Flight 125 | Thailand | Place: Ko Samui | Q16647239 |
| 11/21 | Aeroflot Flight 95 | Soviet Union | Place: Russian Soviet Federative Socialist Republic | Q16532384 |
| 11/24 | 1990 Prague municipal election | Czech Republic | | Q11932218 |
| 11/25 | 1990 Polish presidential election1990年ポーランド大統領選挙 | Poland | | Q673527 |
| 11/25 | Ein Netafim ambush | Israel | | Q28220828 |
| 11/25 | 1990 Ivorian parliamentary election | Ivory Coast | | Q6099605 |
| 11/25 | 1990 Japan CupJapan第10回ジャパンカップ | Japan | Place: Tokyo Racecourse | Q106615144 |
| 11/25 | 1990 Maranhão gubernatorial election | Brazil | | Q18472279 |
| 11/27 | Assamese separatist movementアッサム紛争 | India | Place: Assam | Q4808405 |
| 11/27 | Deutschland Cup | Germany | Place: Rudolf-Harbig-Stadion | Q1206204 |
| 11/28 | Operation Bajrang | Unknown | | Q63348490 |
| 11/29 | 1990 Conservative Party (UK) leadership election1990年イギリス保守党党首選挙 | United Kingdom | | Q5163064 |
| 11/29 | 1990 Egyptian parliamentary election | Egypt | | Q1743215 |
| 11/30 | International Convention on Oil Pollution Preparedness, Response and Co-operationOPRC条約 | Unknown | | Q3093166 |
| 12/1 | Soviet OMON assaults on Lithuanian border postsOMONによるリトアニア国境検問所襲撃事件 | Lithuania | Place: Lithuania | Q3736097 |
| 12/1 | 1990 Clinic of Zaragoza radiotherapy accident1990年サラゴサ放射線治療事故 | Spain | Place: Hospital Clínico Universitario Lozano Blesa | Q11703890 |
| 12/1 | December 19901990年12月 | Unknown | | Q3042495 |
| 12/1 | Deaths in December 1990訃報 1990年12月 | Unknown | | Q23680495 |
| 12/1 | 1990–91 Four Hills Tournament | Unknown | | Q827637 |
| 12/1 | 1990 Hyderabad riots | India | Place: Hyderabad | Q16057112 |
| 12/1 | 1990 Izvestia Trophy | Soviet Union | | Q74711 |
| 12/1 | 1990 Aligarh riots | India | | Q112682938 |
| 12/1 | 1990 Wynwood riot | United States | | Q65066321 |
| 12/1 | December 1, 19901990年12月1日 | Unknown | | Q69298718 |
| 12/2 | 1990 German federal electionドイツ連邦議会1990年選挙 | Germany | | Q704648 |
| 12/2 | 3rd European Film Awards第3回ヨーロッパ映画賞 | Unknown | Place: Glasgow | Q2174245 |
| 12/2 | Beninese constitutional referendum, 1990 | Benin | | Q1313921 |
| 12/2 | 1990 Berlin state election | Germany | | Q2539346 |
| 12/3 | Wayne County Airport runway collisionデトロイト空港衝突事故 | United States | Place: Detroit Metropolitan Wayne County Airport | Q7059916 |
| 12/3 | 1990 Chadian coup d'état | Chad | Place: N'Djamena | Q65047871 |
| 12/3 | December 3, 19901990年12月3日 | Unknown | | Q67198634 |
| 12/6 | orthographic corrections of French in 1990 | Unknown | | Q486561 |
| 12/6 | 1990 Egyptian parliamentary election | Egypt | | Q1743215 |
| 12/6 | 1990 Italian Air Force MB-326 crash | Italy | | Q3975695 |
| 12/8 | Sabadell bombing | Spain | Place: Sabadell | Q16821614 |
| 12/9 | 1990 Serbian general election | Socialist Republic of Serbia | | Q2001802 |
| 12/9 | 1990 Montenegrin general election | Montenegro | | Q3722371 |
| 12/10 | 27th Golden Horse Film Awards第27回金馬奨 | Taiwan | | Q15900164 |
| 12/10 | 10th Golden Rooster Awards | People's Republic of China | Place: Wuchang District | Q15909359 |
| 12/12 | 1990 Danish general election | Denmark, Kingdom of Denmark | | Q1966102 |
| 12/12 | 1990 Back Bay rail accident | United States | Place: Back Bay | Q17510688 |
| 12/13 | 1990 Carlentini earthquake | Italy | | Q3984691 |
| 12/16 | Portuguese Language Orthographic Agreement of 1990 | Portugal | Place: Lisbon | Q1113432 |
| 12/18 | International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families全ての移住労働者及びその家族の権利の保護に関する国際条約 | Unknown | | Q1203898 |
| 12/23 | Slovenian independence referendum, 1990 | Socialist Federal Republic of Yugoslavia | Place: Socialist Republic of Slovenia | Q3439107 |
| 12/23 | Guinean constitutional referendum, 19901990年ギニア憲法改正国民投票 | Guinea | | Q5616513 |
| 12/23 | 35th Arima KinenJapan第35回有馬記念 | Japan | Place: Nakayama Racecourse | Q11600973 |
| 12/24 | 1990 Surinamese coup d'état1990年スリナムクーデター | Suriname | Place: Paramaribo | Q14466700 |
| 12/24 | murder of Tammy Homolka | Canada | Place: St. Catharines | Q55654082 |
| 12/30 | People pardoned by Carlos Menem | Argentina | | Q9008355 |
| 12/31 | 41st NHK Kōhaku Uta GassenJapan第41回NHK紅白歌合戦 | Japan | | Q11601159 |