| 1/1 | The Barricades血の日曜日事件 | Soviet Union, Latvian Soviet Socialist Republic, Latvia | Place: Riga | Q4992563 |
| 1/1 | Gulf War oil spillペルシア湾への石油流出 | Kuwait | | Q297226 |
| 1/1 | January 19911991年1月 | Unknown | | Q2034005 |
| 1/1 | Deaths in January 1991訃報 1991年1月 | Unknown | | Q23001633 |
| 1/1 | 1990–91 Four Hills Tournament | Unknown | | Q827637 |
| 1/1 | Vienna New Year's Concert 1991ウィーンフィル・ニューイヤーコンサート1991 | Unknown | | Q28105647 |
| 1/6 | 1990 National Society of Film Critics Awards第25回全米映画批評家協会賞 | United States | | Q6978568 |
| 1/8 | assassination of Nikos Temponeras | Greece | | Q12881562 |
| 1/12 | Boston Chinatown massacre | United States | | Q84607224 |
| 1/12 | 8th AVN Awards | United States | Place: Tropicana Las Vegas | Q30595281 |
| 1/13 | January Events血の日曜日事件 | Lithuania | Place: Vilnius | Q1540695 |
| 1/13 | 1991 Portuguese presidential election1991年ポルトガル共和国大統領選挙 | Portugal | | Q3586629 |
| 1/13 | 1991 Cape Verdean parliamentary election | Cape Verde | | Q3586976 |
| 1/13 | Oppenheimer Stadium disaster | South Africa | | Q7098555 |
| 1/15 | solar eclipse of January 15, 19911991年1月15日の日食 | Unknown | | Q1146483 |
| 1/17 | Gulf War air campaign | Iraq | Place: Iraq | Q8256467 |
| 1/19 | 48th Golden Globe Awards第48回ゴールデングローブ賞 | United States | Place: Los Angeles | Q994592 |
| 1/19 | Package Q Strike | Iraq | Place: Baghdad | Q7122885 |
| 1/20 | Crimean autonomy referendum, 19911991年の住民投票 | Soviet Union | Place: Crimean Oblast | Q15977419 |
| 1/20 | 1991 Hessian state election | Germany | | Q1591241 |
| 1/20 | 1991 São Toméan legislative election | São Tomé and Príncipe | | Q2053555 |
| 1/22 | 1991 Barbadian general election | Barbados | | Q4858575 |
| 1/24 | Attack on Ras Tanura | Saudi Arabia | Place: Ras Tanura | Q28162756 |
| 1/27 | Wide Right大きく右に外れて | United States | | Q7998618 |
| 1/29 | 1991 State of the Union Address | United States | | Q4587110 |
| 1/30 | Bamako Convention | Unknown | Place: Bamako | Q2996251 |
| 1/30 | Samurra Air Battle | Iraq | Place: Khan Bani Saad City | Q28162754 |
| 1/31 | 1991 Hindu Kush earthquake | Soviet Union, Pakistan, Afghanistan | | Q6556541 |
| 2/1 | USAir Flight 1493ロサンゼルス国際空港地上衝突事故 | United States | Place: Los Angeles International Airport | Q949020 |
| 2/1 | February 19911991年2月 | Unknown | | Q12580176 |
| 2/1 | 1991 Sweden Hockey Games | Sweden | | Q179239 |
| 2/1 | Deaths in February 1991訃報 1991年2月 | Unknown | | Q22988818 |
| 2/1 | 1991 Copa del Rey de Baloncesto | Spain | Place: Zaragoza | Q25056767 |
| 2/1 | 1991 Yasar Dogu Tournament | Turkey | Place: Istanbul | Q110793308 |
| 2/1 | 1990 Yasar Dogu Tournament | Turkey | Place: Istanbul | Q110793353 |
| 2/2 | 1991 24 Hours of Daytona | United States | Place: Daytona International Speedway | Q104791336 |
| 2/2 | Spellemannprisen 1990 | Norway | Place: Chateau Neuf | Q12002231 |
| 2/2 | 1991 South American Cross Country Championships | Ecuador | Place: Ambato | Q16823464 |
| 2/5 | Honored Scientist of Azerbaijan | Azerbaijan | | Q25543507 |
| 2/5 | 1991 Grand Prix La Marseillaise | France | | Q30346812 |
| 2/6 | 1991 Gulf War KC-135 incident1991年アメリカ空軍KC-135エンジン脱落事故 | Unknown | Place: Arabian Desert | Q108056567 |
| 2/7 | Downing Street mortar attack | United Kingdom | Place: 10 Downing Street | Q1542423 |
| 2/9 | Lithuanian independence referendum, 1991独立をめぐるリトアニアの国民投票 | Soviet Union | | Q4139793 |
| 2/9 | Burundian Charter of National Unity referendum, 1991 | Burundi | | Q5000998 |
| 2/10 | Brit Awards 1991 | United Kingdom | Place: Dominion Theatre | Q3632226 |
| 2/10 | 1991 NBA All-Star Game | Canada | Place: Charlotte Coliseum | Q2333486 |
| 2/11 | 26th Guldbagge Awards | Unknown | | Q17007690 |
| 2/11 | 1991 Interflug A310 incident | Unknown | | Q138296736 |
| 2/13 | Amiriyah shelter bombing | Ba'athist Iraq | Place: Al-A'amiriya | Q2071090 |
| 2/13 | 1991 British Army Lynx shootdown | Ireland | | Q123171242 |
| 2/13 | 1991 United States embassy sniper attack | West Germany | Place: Bonn | Q55601395 |
| 2/14 | Culemborg fireworks disaster | Netherlands | | Q60721433 |
| 2/16 | 5th Goya Awards第5回ゴヤ賞 | Spain | Place: Palacio de Congresos | Q354236 |
| 2/17 | 1991 Cape Verdean presidential election | Cape Verde | | Q3586518 |
| 2/17 | Ryan International Airlines Flight 590 | Unknown | | Q104776742 |
| 2/17 | 1991 Beninese parliamentary election | Benin | | Q16951200 |
| 2/20 | LAN Chile Flight 1069 | Chile | Place: Guardiamarina Zañartu Airport | Q6164937 |
| 2/23 | Kunan Poshpora incident | India | Place: Kupwara district | Q3449489 |
| 2/23 | 1991 Thai coup d'étatタイ軍事クーデター (1991年) | Thailand | | Q6585266 |
| 2/23 | Ccano massacre | Peru | | Q117405183 |
| 2/24 | WrestleWar | United States | Place: Arizona Veterans Memorial Coliseum | Q25240812 |
| 2/25 | Convention on Environmental Impact Assessment in a Transboundary Context | Unknown | Place: Espoo | Q2991602 |
| 2/26 | Battle of Al Busayyah | Iraq | Place: Al Muthanna Governorate | Q3636316 |
| 2/26 | Battle of Phase Line Bulletブレット統制線の戦い | Unknown | | Q3636571 |
| 2/27 | Highway of Death死のハイウェイ | Kuwait | | Q1424697 |
| 2/27 | Battle of Norfolkノーフォークの戦い | Iraq | Place: Al Muthanna Governorate | Q3636553 |
| 2/27 | Battle of Medina Ridge | Iraq | Place: Basra | Q1634629 |
| 2/27 | Battle of Kuwait International Airport | Kuwait | Place: Kuwait International Airport | Q19428991 |
| 2/27 | 1991 Bangladeshi general election1991年バングラデシュ総選挙 | Bangladesh | | Q4855471 |
| 2/27 | Battle for Jalibah Airfield | Iraq | Place: Jalibah Southeast Air Base | Q4870165 |
| 2/28 | Liberation of Kuwait Campaignクウェート解放作戦 | Kuwait | Place: Kuwait | Q6541036 |
| 2/28 | Air engagements of the Gulf War | Iraq | Place: Iraq | Q4698322 |
| 3/1 | Plitvice Lakes incidentプリトビツェ湖群事件 | Croatia | Place: Plitvice Lakes National Park | Q852157 |
| 3/1 | Palestinian exodus from Kuwait (1990–91) | Kuwait | | Q123906912 |
| 3/1 | March 19911991年3月 | Unknown | | Q3294925 |
| 3/1 | Deaths in March 1991訃報 1991年3月 | Unknown | | Q22988820 |
| 3/1 | 1991 World Short Track Speed Skating Team Championships | South Korea | Place: Seoul | Q73914609 |
| 3/1 | Safwan Airfield Standoff | Iraq | Place: Safwan | Q7398852 |
| 3/1 | 1991 uprising in Saddam City | Unknown | Place: Sadr City | Q22935687 |
| 3/1 | 44th Bodil Awards | Denmark | | Q16959342 |
| 3/2 | Battle of Rumaila | Iraq | Place: Lake Hammar | Q4872216 |
| 3/2 | 1991 Omloop Het Volk | Belgium | | Q54430624 |
| 3/2 | Havelock Road Bombing | Unknown | | Q5683600 |
| 3/3 | United Airlines Flight 585ユナイテッド航空585便墜落事故 | United States | Place: Colorado Springs | Q462847 |
| 3/3 | Estonian independence referendum, 1991独立に関する1991年エストニア住民投票 | Soviet Union | | Q5401664 |
| 3/3 | Latvian independence and democracy poll, 1991ラトビアの独立と民主主義に関する国民投票 | Latvian Soviet Socialist Republic | Place: Latvia | Q4335477 |
| 3/3 | 1991 São Toméan presidential election | São Tomé and Príncipe | | Q2115203 |
| 3/3 | 1991 Cappagh killings | United Kingdom | Place: Cappagh | Q4586761 |
| 3/3 | 1991 Hong Kong local elections1991年香港区議会選挙 | United Kingdom | | Q2657057 |
| 3/3 | March 3, 19911991年3月3日 | Unknown | | Q69298823 |
| 3/5 | Aeropostal Alas de Venezuela Flight 108アエロポスタル・ベネズエラ108便墜落事故 | Venezuela | | Q4688400 |
| 3/5 | 1991 Greenlandic general election | Greenland, Denmark | | Q15410699 |
| 3/7 | Festival RTP da Canção 1991 | Portugal | Place: Feira Internacional de Lisboa | Q10281925 |
| 3/9 | 16th César Awards第16回セザール賞 | France | Place: Théâtre des Champs-Élysées | Q896977 |
| 3/10 | 1991 Beninese presidential election | Benin | | Q4888046 |
| 3/10 | 1991 Salvadoran legislative election | El Salvador | | Q7406521 |
| 3/10 | 1991 500 km of FujiJapan | Japan | Place: Oyama | Q92159202 |
| 3/11 | 17th People's Choice Awards | United States | Place: Universal Studios Hollywood | Q4553665 |
| 3/15 | German reunificationドイツ再統一 | East Germany, Germany | Place: East Germany | Q56039 |
| 3/16 | Killing of Latasha Harlinsラターシャ・ハーリンズ殺害事件 | United States | Place: Los Angeles | Q105596762 |
| 3/16 | 43rd Directors Guild of America Awards第43回全米監督協会賞 | United States | Place: The Beverly Hilton | Q55602815 |
| 3/17 | 1991 Soviet Union referendum1991年のソビエト連邦国民投票 | Soviet Union, Russia | | Q2679354 |
| 3/17 | 44th British Academy Film Awards第44回英国アカデミー賞 | United Kingdom | Place: London | Q2579872 |
| 3/17 | Russian presidential referendum, 1991 | Soviet Union, Russia | Place: Russian Soviet Federative Socialist Republic | Q4127536 |
| 3/17 | 1991 Finnish parliamentary election | Finland | | Q1230246 |
| 3/17 | Ukrainian sovereignty referendum, 1991 | Soviet Union | | Q17096515 |
| 3/17 | Abkhazian New Union Treaty referendum, 1991 | Republic of Abkhazia | | Q4393808 |
| 3/17 | 1991 Gold Coast IndyCar Grand Prix | Australia | Place: Surfers Paradise Street Circuit | Q4586864 |
| 3/18 | Disappearance of Thomas Gibson | Unknown | | Q95694600 |
| 3/19 | 1991 uprising in Karbala | Unknown | Place: Karbala | Q16851705 |
| 3/20 | 1991 Bhadrak Riot | India | | Q16057115 |
| 3/23 | 6th Independent Spirit Awards第6回インディペンデント・スピリット賞 | United States | Place: The Beverly Hilton | Q1661115 |
| 3/23 | An-24 crash in Navoiy | Uzbekistan | | Q16662351 |
| 3/24 | 11th Golden Raspberry Awards第11回ゴールデンラズベリー賞 | United States | Place: Hollywood Roosevelt Hotel | Q1535202 |
| 3/24 | 1991 uprising in Tuz Khormato | Iraq | Place: Tuz Khormato | Q4587298 |
| 3/25 | 63rd Academy Awards第63回アカデミー賞 | United States | Place: California | Q910856 |
| 3/25 | Karađorđevo agreementカラジョルジェヴォ会談 | Serbia | Place: Karađorđevo, Bačka Palanka | Q1271272 |
| 3/26 | Treaty of Asunciónアスンシオン条約 | Unknown | Place: Asunción | Q3647761 |
| 3/26 | Singapore Airlines Flight 117シンガポール航空117便ハイジャック事件 | Unknown | | Q2784125 |
| 3/26 | 1991 Malian coup d'état1991年マリ政変 | Mali | | Q19955933 |
| 3/28 | 1991 Altun Köpru massacre | Ba'athist Iraq | Place: Altun Kupri | Q6011442 |
| 3/28 | 1991 Dwars door Vlaanderen | Belgium | | Q19832826 |
| 3/28 | 1991 Drumbeg killings | Northern Ireland | | Q48812953 |
| 3/29 | 5th National Congress of the Lao People's Revolutionary Party | Laos | Place: Vientiane | Q105098998 |
| 3/30 | 1991 E3 Harelbeke | Belgium | | Q29843758 |
| 3/31 | 1991 Georgian independence referendum1991年ジョージア独立住民投票 | Soviet Union | | Q3648797 |
| 3/31 | 1991 Albanian Constitutional Assembly election | Albania | | Q368458 |
| 3/31 | 1991 Brabantse Pijl | Belgium | | Q55601380 |
| 4/1 | April 19911991年4月 | Unknown | | Q2874566 |
| 4/1 | Deaths in April 1991訃報 1991年4月 | Unknown | | Q22988823 |
| 4/1 | 1991 Grand Prix de Denain | France | | Q21008458 |
| 4/1 | Randa rockslides | Switzerland | | Q7291451 |
| 4/1 | Yeşilova incident | Unknown | Place: Yeşilova | Q8053375 |
| 4/1 | 1991 uprising in Basra | Iraq | Place: Basra | Q4587293 |
| 4/1 | 1991 Tournoi des As | France | Place: Paris | Q135426349 |
| 4/1 | WCW/New Japan Supershow IJapan | Japan | | Q55637273 |
| 4/2 | 1991 Paris–Camembert | France | | Q28747393 |
| 4/3 | 1991 uprising in Sulaymaniyah | Iraq | Place: Sulaymaniyah | Q4587297 |
| 4/3 | 1991 Chicago mayoral election | United States | | Q16153938 |
| 4/4 | 1991 Merion mid-air collisionメリオン空中衝突事故 | United States | | Q48837243 |
| 4/4 | 1991 Sacramento hostage crisis | Unknown | | Q4587079 |
| 4/4 | 1990–91 Alto Mayo earthquakes | Peru | | Q6143240 |
| 4/5 | Atlantic Southeast Airlines Flight 2311アトランティック・サウスイースト航空2311便墜落事故 | United States | Place: Brunswick Golden Isles Airport | Q4816544 |
| 4/5 | 1991 Western Samoan general election | Samoa | | Q7409962 |
| 4/6 | 1991 Grand National | Unknown | Place: Aintree Racecourse | Q4586859 |
| 4/7 | 1991 Albanian Constitutional Assembly election | Albania | | Q368458 |
| 4/7 | 1991 Hokkaido gubernatorial electionJapan1991年北海道知事選挙 | Japan | | Q11186118 |
| 4/7 | Tokyo gubernatorial election, 1991Japan1991年東京都知事選挙 | Japan | | Q11186120 |
| 4/7 | 51st Oka ShoJapan第51回桜花賞 | Japan | Place: Kyoto Racecourse | Q11601355 |
| 4/7 | Battle of Kore | Unknown | | Q138698580 |
| 4/7 | 1991 Czech Social Democratic Party leadership election | Czechoslovakia | | Q39054862 |
| 4/10 | 1991 Gent–Wevelgemヘント〜ウェヴェルヘム1991 | Belgium | | Q3758044 |
| 4/11 | 22nd GMA Dove Awards | United States | | Q16151221 |
| 4/12 | 1991 Saban general election | Kingdom of the Netherlands | | Q21071002 |
| 4/14 | 1991 430 km of SuzukaJapan | Japan | Place: Suzuka Circuit | Q386470 |
| 4/15 | 1991 Boston Marathonボストン・マラソン1991 | United States | Place: Boston | Q1956828 |
| 4/17 | 1991 La Flèche Wallonneフレッシュ・ワロンヌ1991 | Belgium | | Q3752569 |
| 4/18 | Air Tahiti Flight 805 | Unknown | | Q90500158 |
| 4/19 | 1991 Patras bombing | Greece | Place: Patras | Q56319463 |
| 4/20 | 1991 Icelandic parliamentary election | Iceland | | Q2035416 |
| 4/21 | 10th Hong Kong Film Awards第10回香港電影金像奨 | British Hong Kong | | Q986411 |
| 4/21 | 1991 Rhineland-Palatinate state election | Germany | | Q1403392 |
| 4/21 | 1991 London Marathonロンドン・マラソン1991 | United Kingdom | Place: London | Q2483649 |
| 4/21 | 1991 Scheldeprijs | Belgium | | Q48850654 |
| 4/22 | 1991 Kids' Choice Awards | United States | Place: Los Angeles | Q2335570 |
| 4/22 | 1991 Limon earthquake | Costa Rica | | Q4586935 |
| 4/24 | 1991 West Bengal Legislative Assembly election | India | | Q28405540 |
| 4/26 | 1991 Andover tornado | United States | | Q131388545 |
| 4/27 | 26th Golden Bell Awards | Taiwan | Place: National Dr. Sun Yat-sen Memorial Hall | Q18118957 |
| 4/29 | 1991 Bangladesh cyclone1991年のバングラデシュ・サイクロン | Bangladesh | | Q806498 |
| 4/29 | 1991 Racha earthquake | Unknown | | Q2917519 |
| 4/30 | 1991 Lesotho coup d'état | Lesotho | Place: Maseru | Q25043351 |
| 5/1 | May 19911991年5月 | Unknown | | Q3277976 |
| 5/1 | deaths in May 1991訃報 1991年5月 | Unknown | | Q22988824 |
| 5/1 | Randa rockslides | Switzerland | | Q7291451 |
| 5/1 | 1991 England Challenge Cup | Unknown | | Q4586827 |
| 5/2 | Battle of Borovo Selo | Croatia | Place: Borovo | Q1851834 |
| 5/2 | 1991 anti-Serb riot in Zadar | Croatia | | Q4586802 |
| 5/5 | 1991 Hong Kong municipal elections | United Kingdom | | Q10844073 |
| 5/5 | 1991 1000 km of Fuji (All Japan)Japan | Japan | Place: Oyama | Q92159867 |
| 5/5 | Our Socialism Centred on the Masses Shall not Perish | North Korea | | Q95609875 |
| 5/9 | Grand Prix de Wallonie 1991 | Belgium | | Q20731465 |
| 5/12 | 1991 Nepalese legislative election | Nepal | | Q6994498 |
| 5/12 | Referendum on the status of SAO Krajina | Socialist Republic of Croatia | | Q56393823 |
| 5/14 | Shigaraki train disasterJapan信楽高原鐵道列車衝突事故 | Japan | | Q1312446 |
| 5/15 | Operation Ring円環作戦 | Azerbaijan | Place: Çaykənd | Q2412363 |
| 5/16 | 1991 Sino-Soviet Border Agreement中ソ東部国境協定 | Unknown | | Q4587095 |
| 5/16 | Yemeni constitutional referendum, 1991 | Yemen | | Q8052123 |
| 5/16 | May 16, 19911991年5月16日 | Unknown | | Q69298906 |
| 5/17 | Miss Universe 1991ミス・ユニバース1991 | Unknown | Place: Planet Hollywood Resort & Casino | Q276801 |
| 5/17 | May 17, 19911991年5月17日 | Unknown | | Q69298907 |
| 5/18 | Signing of Somaliland Declaration of Independence | Somaliland | | Q104524691 |
| 5/18 | 1991 Scottish Cup Final | United Kingdom | Place: Hampden Park | Q4587088 |
| 5/19 | Croatian independence referendum独立を問う国民投票 | Yugoslavia | | Q3085493 |
| 5/19 | 1991 Cypriot legislative election1991年キプロス議会総選挙 | Cyprus | | Q3496797 |
| 5/19 | May 19, 19911991年5月19日 | Unknown | | Q64852973 |
| 5/19 | SuperBrawl IスーパーブロウルI | United States | | Q7641977 |
| 5/20 | 1991 Indian general election1991年インド総選挙 | India | | Q3532223 |
| 5/21 | assassination of Rajiv Gandhiラジヴ・ガンディーの暗殺 | India | Place: Sriperumbudur | Q3423445 |
| 5/21 | 1991 Balearic regional election1991年バレアレス諸島自治州議会選挙 | Spain | | Q8774394 |
| 5/23 | Aeroflot Flight 8556 | Unknown | Place: Pulkovo Airport | Q16662594 |
| 5/25 | 1991 Surinamese general election | Suriname | | Q16561233 |
| 5/26 | Lauda Air Flight 004ラウダ航空004便墜落事故 | Thailand | Place: Phu Toei National Park | Q675546 |
| 5/26 | 1991 Georgian presidential election1991年ジョージア大統領選挙 | Georgia | | Q5548088 |
| 5/26 | 1991 Spanish local elections1991年スペイン基礎自治体選挙 | Spain | Place: Spain | Q28380 |
| 5/26 | 1991 Extremaduran regional election | Spain | | Q3328625 |
| 5/26 | 1991 Navarrese regional election1991年ナバーラ自治州議会選挙 | Spain | | Q4891219 |
| 5/26 | 1991 Asturian regional election | Spain | | Q8774297 |
| 5/26 | 1991 Castilian-Leonese regional election | Spain | | Q5827495 |
| 5/26 | 1991 Madrilenian regional election | Spain | | Q612630 |
| 5/26 | 1991 Aragonese regional election | Spain | | Q6745041 |
| 5/26 | 1991 Barcelona City Council election | Spain | | Q20312492 |
| 5/26 | 1991 Madrid City Council election | Spain | | Q20921808 |
| 5/26 | 1991 Valencia City Council election | Spain | | Q48843667 |
| 5/26 | 1991 Valencian regional election1991年バレンシア州議会選挙 | Spain | | Q4891284 |
| 5/26 | 1991 Cantabrian regional election1991年カンタブリア自治州議会選挙 | Spain | | Q5827423 |
| 5/26 | 1991 Castilian-Manchegan regional election | Spain | | Q5827480 |
| 5/26 | 1991 Riojan regional election | Spain | | Q5827542 |
| 5/26 | 1991 Basque foral elections | Spain | | Q8774321 |
| 5/26 | 1991 Canarian regional election | Spain | | Q8774370 |
| 5/26 | 1991 Seville City Council election | Spain | | Q48844167 |
| 5/26 | 1991 Spanish local elections in Galicia | Spain | | Q12387521 |
| 5/26 | First Girija Prasad Koirala cabinet | Unknown | | Q128693399 |
| 5/26 | 1991 Murcian regional election | Spain | | Q20978125 |
| 5/27 | 1991 Dutch Senate election1991年オランダ上院選挙 | Netherlands | | Q18285661 |
| 5/28 | Fall of the Derg | Ethiopia | Place: Addis Ababa | Q112125056 |
| 5/29 | 1991 Vic bombing | Spain | Place: Vic | Q1442421 |
| 5/31 | Glenanne barracks bombing | United Kingdom | | Q5568139 |
| 6/1 | June 19911991年6月 | Unknown | | Q3188261 |
| 6/1 | Deaths in June 1991訃報 1991年6月 | Unknown | | Q22988826 |
| 6/1 | 1991 Indian general election in Andhra Pradesh | India | | Q6022302 |
| 6/1 | 1991 Indian general election in Tamil Nadu | India | | Q6022497 |
| 6/1 | 1991 Indian general election in Kerala | India | | Q104858316 |
| 6/1 | Scania 100 Tournament | Sweden | | Q3994651 |
| 6/1 | 1991 European Masters League | Unknown | | Q48815515 |
| 6/2 | 36th David di Donatello Awards第36回ダヴィッド・ディ・ドナテッロ賞 | Italy | Place: Cinecittà | Q3703424 |
| 6/2 | 1991 Hamburg state election | Germany | | Q1021451 |
| 6/2 | 1991 Taça de Portugal Final | Portugal | Place: Estádio Nacional | Q16851700 |
| 6/3 | Coagh ambush | Unknown | Place: Coagh | Q5137658 |
| 6/4 | Canada 1991 Census | Canada | Place: Canada | Q39072607 |
| 6/4 | 1991 Gullegem Koerse | Belgium | | Q115556940 |
| 6/5 | Eurovision Young Dancers 1991 | Unknown | | Q86124 |
| 6/8 | National Victory Celebrationナショナル・ビクトリー・セレブレーション | United States | | Q55137568 |
| 6/8 | 1991 Coupe de France Final | France | Place: Parc des Princes | Q4586792 |
| 6/8 | 1991 Ghotki train crash | Pakistan | | Q16064108 |
| 6/9 | Italian electoral law referendum, 1991 | Italy | | Q3931584 |
| 6/9 | 1991 Banquet Frozen Foods 300 | United States | Place: Sonoma Raceway | Q16950161 |
| 6/9 | UWF Beach Brawl | United States | Place: Manatee Civic Center | Q60738873 |
| 6/10 | June 10, 19911991年6月10日 | Unknown | | Q69298934 |
| 6/12 | 1991 Russian presidential election1991年ロシア大統領選挙 | Russian Socialist Federative Soviet Republic | | Q1363982 |
| 6/12 | 1991 Indian general election1991年インド総選挙 | India | | Q3532223 |
| 6/12 | 1991 Leningrad mayoral election | Russia | | Q16634869 |
| 6/12 | 1991 Kokkadichcholai massacre | Sri Lanka | Place: Kokkadichcholai | Q4586915 |
| 6/14 | Women's Strike of 14 June 1991 | Switzerland | | Q27731559 |
| 6/14 | Taipalsaari Accident 1991 | Finland | Place: Saimaa | Q18682691 |
| 6/15 | 1991 Punjab killings | Unknown | Place: Ludhiana district | Q4587060 |
| 6/16 | 1991 Sicilian regional election | Italy | | Q1094389 |
| 6/16 | 1991 Rally of Ourense | Spain | | Q94700875 |
| 6/17 | United Nations Security Council Resolution 700国際連合安全保障理事会決議700 | Unknown | | Q578896 |
| 6/17 | Treaty of Good Neighbourship独ポ善隣友好条約 | Germany, Poland | | Q324672 |
| 6/18 | 1991 Antofagasta mudflows | Chile | Place: Antofagasta | Q5671266 |
| 6/19 | Le bruit et l'odeur | France | Place: Orléans | Q3228385 |
| 6/20 | Decision on the Capital of Germany | Germany | | Q314701 |
| 6/20 | murder of Harry Collinson | United Kingdom | Place: Butsfield | Q124734813 |
| 6/22 | 1991 DFB-Pokal Final | Germany | Place: Berlin Olympic Stadium | Q28154362 |
| 6/23 | Omar Raddad Affair | France | Place: Mougins | Q2825851 |
| 6/23 | 1991 Burgenland state election | Austria | | Q1550821 |
| 6/24 | 1991 Tamil Nadu Legislative Assembly election | India | | Q7681377 |
| 6/25 | 1991 NBA Draft1991年のNBAドラフト | United States | | Q1673830 |
| 6/26 | 17th Saturn Awards第17回サターン賞 | United States | Place: California | Q1558991 |
| 6/28 | Consistory - 1991 | Vatican City | | Q16160069 |
| 6/30 | Vizconde massacreビスコンデ家殺人事件 | Philippines | | Q7938005 |
| 7/1 | July 19911991年7月 | Unknown | | Q3188197 |
| 7/1 | Deaths in July 1991訃報 1991年7月 | Unknown | | Q22988828 |
| 7/1 | 1991 Swedish Open | Sweden | Place: Båstad Tennis Stadium | Q3978690 |
| 7/1 | 1991 European Ladies' Team Championship | United Kingdom | Place: Wentworth Club | Q109535764 |
| 7/2 | Micronesian constitutional referendum, 1991 | Federated States of Micronesia | | Q6839730 |
| 7/4 | 1991 Kalabahi earthquakes | Unknown | | Q4586911 |
| 7/4 | murder of Paul Broussard | United States | | Q4468596 |
| 7/7 | Brioni Agreementブリオーニ合意 | Unknown | Place: Brijuni | Q917606 |
| 7/10 | first inauguration of Boris Yeltsin | Russia | Place: Moscow | Q25062264 |
| 7/10 | L'Express Airlines Flight 508 | United States | Place: Birmingham | Q6455722 |
| 7/10 | Murder of Alberica Filo della Torre | Italy | Place: Olgiata | Q3705053 |
| 7/11 | Nigeria Airways Flight 2120ナイジェリア航空2120便墜落事故 | Saudi Arabia | Place: King Abdulaziz International Airport | Q2634895 |
| 7/11 | solar eclipse of July 11, 19911991年7月11日の日食 | Unknown | | Q1513462 |
| 7/12 | Constitution of Bulgariaブルガリア共和国憲法 | Bulgaria | | Q1588379 |
| 7/12 | Mauritanian constitutional referendum, 1991 | Mauritania | | Q6793711 |
| 7/12 | murder of Hitoshi IgarashiJapan悪魔の詩訳者殺人事件 | Japan | Place: Tsukuba | Q11492634 |
| 7/13 | 1991 Sikh killings in Uttar Pradesh | India | Place: Pilibhit Tiger Reserve | Q136416796 |
| 7/14 | The Great American Bash | United States | | Q10381433 |
| 7/14 | UEFA Women's Euro 1991 finals | Unknown | Place: Aalborg | Q56296201 |
| 7/18 | murder of Anjelica Castilloアンジェリカ・カスティリョ殺害事件 | Unknown | | Q55089014 |
| 7/18 | murder of André Cools | Belgium | Place: Avenue de l'Observatoire | Q21511556 |
| 7/24 | Economic liberalisation in Indiaインドの経済改革 | Unknown | | Q5333520 |
| 7/24 | disappearance of Ben Needham | Greece | Place: Kos | Q15139370 |
| 7/27 | Operation Stinger | Unknown | Place: Banovina | Q16115872 |
| 7/28 | Concert Yutel for peace | Unknown | | Q5158510 |
| 7/31 | START I第一次戦略兵器削減条約 | Russia | Place: Moscow | Q931492 |
| 8/1 | The Barricades血の日曜日事件 | Soviet Union, Latvian Soviet Socialist Republic, Latvia | Place: Riga | Q4992563 |
| 8/1 | Dalj massacre | Croatia | Place: Dalj | Q526104 |
| 8/1 | Chicken Kiev speechチキンキエフ・スピーチ | United States | Place: Verkhovna Rada building | Q5096252 |
| 8/1 | August 19911991年8月 | Unknown | | Q2858048 |
| 8/1 | Deaths in August 1991訃報 1991年8月 | Unknown | | Q22988829 |
| 8/1 | 1991 World Championships in Athletics – women's heptathlonJapan | Japan | Place: National Stadium in Tokyo | Q4587204 |
| 8/1 | Waddell, Arizona Buddhist temple shooting | United States | Place: Waddell | Q20200260 |
| 8/1 | 38th filmfare awards south第38回フィルムフェア賞 南インド映画部門 | India | | Q25350032 |
| 8/1 | 1991 World Championships in Athletics – women's 400 metresJapan | Japan | Place: National Stadium in Tokyo | Q4587196 |
| 8/1 | 1991 Thailand Masters | Thailand | Place: Bangkok | Q67875530 |
| 8/4 | 1991 British motorcycle Grand Prix | United Kingdom | | Q4586745 |
| 8/4 | 1991 Wincanton Classic | United Kingdom | | Q2143804 |
| 8/4 | 1991 Marlboro 500 | United States | Place: Michigan International Speedway | Q10583818 |
| 8/6 | Tsunduru massacre | India | Place: Tsundur | Q5116261 |
| 8/9 | Battle of Ventersdorp | South Africa | Place: Ventersdorp | Q2838906 |
| 8/9 | First Battle of Elephant Pass | Unknown | Place: Elephant Pass | Q5452514 |
| 8/10 | August 10, 19911991年8月10日 | Unknown | | Q53710011 |
| 8/16 | Indian Airlines Flight 257インディアン航空257便墜落事故 | India | Place: Imphal | Q6019803 |
| 8/17 | Strathfield massacreストラスフィールド大量殺人事件 | Australia | Place: Strathfield Plaza | Q7622106 |
| 8/18 | 1991 San Marino motorcycle Grand Prix | San Marino | | Q3114490 |
| 8/18 | 1991 Züri-Metzgete | Switzerland | | Q2135986 |
| 8/18 | 1991 Mexican legislative election | Mexico | | Q3235459 |
| 8/19 | Operation Opera Orientalis | Croatia | Place: Zagreb | Q2746350 |
| 8/20 | Estonian restoration of Independenceエストニアの独立回復 | Estonia | | Q16631950 |
| 8/20 | 1991 GP Ouest-FranceGP西フランス・プルエー1991 | France | | Q3775271 |
| 8/20 | August 20, 19911991年8月20日 | Unknown | | Q69299014 |
| 8/21 | The incident in the tunnel on the Moscow Garden Ring on August 21, 1991 | Soviet Union | Place: Garden Ring | Q4202298 |
| 8/24 | Amanda Award 1991 | Norway | Place: Haugesund Municipality | Q3910411 |
| 8/27 | Tornade de Maskinongé | Canada | | Q3532322 |
| 8/28 | 1991 Union Square derailment1991年ユニオン・スクエア駅脱線事故 | United States | Place: 14th Street – Union Square | Q16972144 |
| 8/30 | Sierra Leonean constitutional referendum, 1991 | Sierra Leone | | Q7511450 |
| 8/31 | 1991 Singaporean general election | Singapore | | Q7523296 |
| 9/1 | Category:September 1991Category:1991年9月 | Unknown | | Q18704520 |
| 9/1 | September 19911991年9月 | Unknown | | Q3478981 |
| 9/1 | Deaths in September 1991訃報 1991年9月 | Unknown | | Q22946001 |
| 9/1 | Category:September 1991 in Europe | Unknown | | Q30617428 |
| 9/1 | Category:September 1991 by continent | Unknown | | Q30617764 |
| 9/1 | Category:September 1991 by country | Unknown | | Q80097426 |
| 9/1 | Category:September 1991 in sports | Unknown | | Q30613785 |
| 9/1 | riot of Hoyerswerda | Germany | Place: Hoyerswerda | Q780056 |
| 9/1 | Category:September 1991 in the United States | Unknown | | Q80097418 |
| 9/1 | Category:September 1991 in North America | Unknown | | Q80097422 |
| 9/1 | Category:September 1991 in Asia | Unknown | | Q85579567 |
| 9/1 | Category:September 1991 in the Soviet Union | Unknown | | Q127949696 |
| 9/1 | September 1991 Mineriad | Romania | | Q129760 |
| 9/1 | Category:September 1991 in Iran | Unknown | | Q135939167 |
| 9/1 | 1991 Skate America1991年スケートアメリカ | United States | Place: Oakland Arena | Q738954 |
| 9/1 | Category:September 1991 in Oceania | Unknown | | Q81290360 |
| 9/1 | Category:September 1991 in Africa | Unknown | | Q85579549 |
| 9/1 | Category:September 1991 in Australia | Unknown | | Q106366255 |
| 9/1 | Category:September 1991 in Romania | Unknown | | Q106728953 |
| 9/1 | Category:September 1991 in Russia | Unknown | | Q106873162 |
| 9/1 | Category:September 1991 in Germany | Unknown | | Q125114118 |
| 9/1 | Category:September 1991 in France | Unknown | | Q126449590 |
| 9/1 | Category:September 1991 in Italy | Unknown | | Q127427336 |
| 9/1 | Category:September 1991 in Japan | Unknown | | Q127949697 |
| 9/1 | Category:September 1991 in Egypt | Unknown | | Q129175429 |
| 9/1 | Category:September 1991 in Yugoslavia | Unknown | | Q131511553 |
| 9/1 | Category:September 1991 sports events in Japan | Unknown | | Q135972440 |
| 9/1 | murder of Leanne Sarah Holland | Australia | | Q29300442 |
| 9/1 | Category:September 1991 sports events in Europe | Unknown | | Q30618965 |
| 9/1 | Category:September 1991 sports events in Oceania | Unknown | | Q81290352 |
| 9/1 | Category:September 1991 sports events in the United States | Unknown | | Q81290529 |
| 9/1 | Category:September 1991 sports events in North America | Unknown | | Q81290537 |
| 9/1 | Category:September 1991 sports events in Africa | Unknown | | Q85579543 |
| 9/1 | Category:September 1991 sports events in Asia | Unknown | | Q85579562 |
| 9/1 | Category:September 1991 in Canada | Unknown | | Q86803148 |
| 9/1 | Category:September 1991 in the United Kingdom | Unknown | | Q86803153 |
| 9/3 | Hamlet chicken processing plant fireハムレット工場火災 | United States | | Q5645476 |
| 9/4 | Četekovac massacre | Croatia | Place: Četekovac | Q12639989 |
| 9/7 | murder of Tupac Shakur | United States | Place: Las Vegas | Q3882218 |
| 9/7 | King of the Ring | Unknown | | Q85774511 |
| 9/8 | 1991 Macedonian independence referendum | Socialist Federal Republic of Yugoslavia | | Q3130232 |
| 9/8 | 1991 Azerbaijani presidential election | Azerbaijan | | Q4832436 |
| 9/8 | 1991 Argentine legislative election | Argentina | | Q4789476 |
| 9/9 | Category:September 9, 1991 | Unknown | | Q88748903 |
| 9/11 | Continental Express Flight 2574コンチエンタル・エクスプレス航空2574便墜落事故 | United States | Place: Texas | Q3662192 |
| 9/12 | 1991 Hong Kong legislative election1991年香港立法局選挙 | United Kingdom | | Q10844074 |
| 9/15 | 1991 Swedish general election1991年スウェーデン総選挙 | Sweden | | Q931619 |
| 9/15 | Bangladeshi constitutional referendum, 1991 | Bangladesh | | Q4231505 |
| 9/15 | 1991 Mauritian general election | Mauritius | | Q6793770 |
| 9/15 | 1991 Swedish municipal elections | Sweden | | Q7655010 |
| 9/16 | Mutxamel bombing | Spain | Place: Mutxamel | Q6944249 |
| 9/16 | 1991 Sugo 500kmJapan | Japan | Place: Murata | Q17145687 |
| 9/18 | 1991 Paris–Brussels | France, Belgium | | Q57778514 |
| 9/21 | Armenian independence referendum, 1991アルメニアの独立に関する住民投票 | Armenian Soviet Socialist Republic | | Q4793269 |
| 9/21 | Korana bridge killings | Croatia | Place: Karlovac | Q31134038 |
| 9/21 | Ivanovo Selo massacre | Croatia | Place: Ivanovo Selo | Q16111340 |
| 9/22 | 1991 Grote Prijs Jef Scherens | Belgium | | Q18613156 |
| 9/22 | Liechtenstein referendum, 1991 | Liechtenstein | | Q6544014 |
| 9/23 | 1991 New Brunswick general election | Canada | | Q3586352 |
| 9/28 | Monsters of Rock | Soviet Union | Place: Tushino airfield | Q4301946 |
| 9/29 | 1991 Haitian coup d'étatクーデター | Haiti | | Q4586873 |
| 9/29 | 1991 Bremen state election | Germany | | Q1021423 |
| 9/29 | 1991 Berlin Marathonベルリン・マラソン1991 | Germany | Place: Berlin | Q2427350 |
| 9/29 | 1991 Tyson Holly Farms 400 | United States | Place: North Wilkesboro Speedway | Q117247921 |
| 9/29 | 1991 Abkhazian parliamentary election | Republic of Abkhazia | | Q20311786 |
| 9/30 | Kosovan independence referendum, 1991 | Socialist Federal Republic of Yugoslavia | | Q6433341 |
| 10/1 | October 19911991年10月 | Unknown | | Q3348940 |
| 10/1 | Deaths in October 1991訃報 1991年10月 | Unknown | | Q22946003 |
| 10/1 | 1991 Stockholm Open | Sweden | Place: Avicii Arena | Q3973714 |
| 10/1 | 1991 Skate Canada International1991年スケートカナダ | Canada | Place: London | Q3486186 |
| 10/1 | Ravno massacre | Yugoslavia | | Q136172008 |
| 10/4 | Protocol on Environmental Protection to the Antarctic Treaty環境保護に関する南極条約議定書 | Antarctic Treaty area | Place: Madrid | Q2991463 |
| 10/5 | 1991 Jakarta Indonesian Air Force C-130 crash1991年インドネシア空軍C-130墜落事故 | Indonesia | Place: Jakarta | Q16662312 |
| 10/6 | 1991 Portuguese legislative election1991年ポルトガル議会選挙 | Portugal | | Q2053113 |
| 10/6 | murder of Sonia Rescalvo Zafra | Spain | Place: Parc de la Ciutadella | Q17621747 |
| 10/6 | 1991 Grand Prix des Amériques (cycling race) | Canada | | Q3775478 |
| 10/6 | murder of Igor Talkov | Soviet Union | Place: Yubileyny Sports Palace | Q4468586 |
| 10/6 | 1991 Upper Austrian state election | Austria | | Q1804154 |
| 10/7 | Bombing of Banski dvori | Croatia | | Q4940688 |
| 10/8 | Independence of Croatiaクロアチア共和国 (1990年-1991年) | Croatia | | Q6016257 |
| 10/8 | 1991 Bangladeshi presidential election | Bangladesh | | Q55604835 |
| 10/9 | October 9, 19911991年10月9日 | Unknown | | Q47468574 |
| 10/12 | 1991 Holzminden ambush | Germany | Place: Boffzen | Q2102037 |
| 10/13 | 1991 Bulgarian parliamentary election1991年ブルガリア国民議会選挙 | Bulgaria | | Q2477400 |
| 10/13 | 1991 Kyrgyz presidential election | Kyrgyzstan | | Q6452431 |
| 10/14 | 1991 Abkhazian parliamentary election | Republic of Abkhazia | | Q20311786 |
| 10/16 | Luby's massacreルビーズ銃乱射事件 | United States | Place: Killeen | Q4135498 |
| 10/16 | October 16, 19911991年10月16日 | Unknown | | Q69299077 |
| 10/16 | 1991 United Nations Security Council election1991年国連安保理 非常任理事国選挙 | United Nations | | Q7888935 |
| 10/17 | 1991 Armenian presidential election | Armenia | | Q4793286 |
| 10/17 | 1991 Rudrapur bombings | India | Place: India | Q16057118 |
| 10/17 | 1991 British Columbia general election | Canada | | Q4969816 |
| 10/20 | 1991 Turkish general election | Turkey | | Q1582335 |
| 10/20 | 1991 Swiss federal election | Switzerland | | Q3586923 |
| 10/20 | 1991 Uttarkashi earthquake | Unknown | | Q3629959 |
| 10/20 | 1991 Ålandic legislative election | Finland | | Q4345579 |
| 10/20 | 1991 Norwegian Football Cup Final | Norway | Place: Ullevaal Stadion | Q60776586 |
| 10/21 | Baćin massacre | Croatia | Place: Baćin | Q3514508 |
| 10/21 | Široka Kula massacre | Croatia | | Q8082793 |
| 10/21 | 1991 Saskatchewan general election | Canada | | Q3586450 |
| 10/23 | 1991 Paris Peace Accordsパリ協定 (カンボジア和平) | France | Place: Paris | Q15092854 |
| 10/25 | Gospić massacreゴスピッチの虐殺 | Croatia | Place: Gospić | Q1243060 |
| 10/26 | Turkmenistani independence referendum, 1991トルクメニスタンの独立に関する住民投票 | Turkmen Soviet Socialist Republic | Place: Turkmenistan | Q7855448 |
| 10/26 | 1991 Grand Prix des Nations | Italy | | Q20108188 |
| 10/27 | 1991 Polish parliamentary election1991年ポーランド議会選挙 | Poland | | Q2608105 |
| 10/27 | 1991 Chicago Marathonシカゴ・マラソン1991 | United States | Place: Chicago | Q13463032 |
| 10/27 | 1991 Sandžak autonomy referendum | Yugoslavia | | Q61358162 |
| 10/27 | 104th Tenno ShoJapan第104回天皇賞 | Japan | Place: Tokyo Racecourse | Q11600026 |
| 10/27 | Halloween Havoc | United States | | Q30600514 |
| 10/27 | 1991 Scottish League Cup Final | Unknown | Place: Hampden Park | Q4484676 |
| 10/29 | 1991 RAAF Boeing 707 crash | Unknown | | Q101438795 |
| 10/29 | Požega villages killings | Croatia | | Q86756570 |
| 10/31 | 1991 Zambian general election1991年ザンビア総選挙 | Zambia | | Q2539329 |
| 11/1 | Deaths in November 1991訃報 1991年11月 | Unknown | | Q20028095 |
| 11/1 | November 19911991年11月 | Unknown | | Q3345439 |
| 11/1 | University of Iowa shootingアイオワ大学銃乱射事件 | United States | Place: Iowa City | Q4284237 |
| 11/1 | 1991 Grand Prix International de Paris | France | Place: La halle de glace Olympique | Q130638 |
| 11/1 | 1991 Nations Cup | Germany | Place: Gelsenkirchen | Q7737343 |
| 11/1 | 1991 Deutschland Cup | Germany | | Q104184843 |
| 11/2 | 1991 Rugby World Cup Final | United Kingdom | Place: Twickenham Stadium | Q4587072 |
| 11/2 | Santo Tomás de Pata killings | Peru | | Q111361993 |
| 11/3 | Barrios Altos massacreバリオス・アルトス事件 | Peru | Place: Barrios Altos | Q3029749 |
| 11/3 | 1991 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 | Q2247663 |
| 11/3 | 1991 Pyroil 500 | United States | Place: Phoenix Raceway | Q117248056 |
| 11/3 | 1991 500 Miles of SugoJapan | Japan | Place: Murata | Q92159418 |
| 11/4 | Attempted assassination of Zahir Shah | Italy | Place: Rome | Q136557313 |
| 11/5 | 1991 United States gubernatorial elections1991年アメリカ合衆国州知事選挙 | United States | | Q127475 |
| 11/7 | Alpine ConventionAlpine convention | Unknown | | Q83514 |
| 11/7 | Poljanak and Vukovići massacres | Croatia | | Q12639982 |
| 11/7 | Aeroflot-Yugavia Flight 519 | Soviet Union | Place: Makhachkala | Q16662639 |
| 11/9 | 3rd Golden Melody Awards第3回金曲奨 | Taiwan | Place: National Dr. Sun Yat-sen Memorial Hall | Q15900346 |
| 11/10 | Bosnian Serb referendum, 1991 | Bosnia and Herzegovina | | Q4947415 |
| 11/10 | Erdut massacre | Croatia | Place: Erdut | Q303603 |
| 11/10 | 1991 Viennese state and municipal council election | Austria | | Q1803974 |
| 11/11 | 1991 United Nations Secretary-General selection1991年の国際連合事務総長の選出 | United Nations | | Q29469053 |
| 11/12 | Santa Cruz massacreサンタクルス事件 | Timor-Leste | Place: Dili | Q782441 |
| 11/12 | Saborsko massacre | Croatia | Place: Saborsko | Q503678 |
| 11/14 | 1991 Craigavon killings | Northern Ireland | | Q56277275 |
| 11/15 | Bor massacreボル虐殺 | Republic of Sudan | Place: Bor | Q16209296 |
| 11/15 | Kostrići massacre | Croatia | | Q12639974 |
| 11/15 | 1991 Miaoli train collision | Taiwan | | Q19853559 |
| 11/16 | 1991 Lokhandwala Complex shootout | Unknown | Place: Lokhandwala Complex | Q4586931 |
| 11/16 | Equatorial Guinean constitutional referendum, 1991 | Equatorial Guinea | | Q5384268 |
| 11/16 | 1991 Louisiana gubernatorial election1991年ルイジアナ州知事選挙 | United States | | Q6689390 |
| 11/18 | Volatile Organic Compounds Protocol | Unknown | | Q7939989 |
| 11/19 | Škabrnja massacre | Croatia | Place: Škabrnja | Q1470352 |
| 11/19 | Borovo Naselje massacre | Croatia | Place: Borovo Naselje | Q1907373 |
| 11/20 | Vukovar massacreヴコヴァルの虐殺 | Croatia | Place: Grabovo, Tompojevci | Q520741 |
| 11/20 | 1991 Azerbaijani Mil Mi-8 shootdown1991年ソ連国内軍ヘリ撃墜事件 | Azerbaijan | Place: Nagorno-Karabakh | Q501208 |
| 11/21 | 1991 killings of Serbs in Novska | Croatia | | Q112317351 |
| 11/24 | 1991 Tajik presidential election | Tajikistan | | Q7676842 |
| 11/24 | 1991 Belgian general election | Belgium | | Q211546 |
| 11/24 | 1991 North Korean local elections | North Korea | | Q15982535 |
| 11/26 | 12th Genie Awards第12回ジニー賞 | Canada | Place: Ed Mirvish Theatre | Q654104 |
| 11/29 | Guemmar attack | Unknown | | Q124936403 |
| 12/1 | Ukrainian independence referendum1991年ウクライナ独立国民投票 | Soviet Union | | Q926594 |
| 12/1 | 1991 Ukrainian presidential election1991年ウクライナ大統領選挙 | Ukraine | | Q779385 |
| 12/1 | 1991 Kazakh presidential election | Kazakhstan | | Q3700312 |
| 12/1 | 4th European Film Awards第4回ヨーロッパ映画賞 | Unknown | Place: Babelsberg Studio | Q679138 |
| 12/1 | Transnistrian independence referendum, 1991 | Transnistria | | Q4393794 |
| 12/1 | December 19911991年12月 | Unknown | | Q3042494 |
| 12/1 | Deaths in December 1991訃報 1991年12月 | Unknown | | Q22927284 |
| 12/1 | 1991 Transnistrian presidential election | Transnistria | | Q3920207 |
| 12/1 | 1991–92 Four Hills Tournament | Unknown | | Q827662 |
| 12/1 | Operation Alfa | Unknown | | Q1564806 |
| 12/1 | Transcarpathian general regional referendum, 1991 | Ukraine | | Q20076954 |
| 12/1 | 1991 Burkinabè presidential election | Burkina Faso | | Q4999067 |
| 12/1 | 1991 NHK TrophyJapan1991年NHK杯国際フィギュアスケート競技大会 | Japan | Place: Hiroshima | Q248380 |
| 12/1 | Masakatsu Nishikawa (serial killer)Japanスナックママ連続殺人事件 | Japan | Place: Japan | Q11312554 |
| 12/1 | 13th Youth in Film Awards | United States | Place: Academy of Television Arts & Sciences | Q4549567 |
| 12/1 | 1991 Paraguayan Constitutional Assembly election | Paraguay | | Q7134693 |
| 12/2 | 1991 Syrian presidential election | Syria | | Q7663298 |
| 12/2 | 1991 Vanuatuan general election | Vanuatu | | Q1095688 |
| 12/4 | Agreement on the Conservation of Populations of European Bats | Unknown | | Q321945 |
| 12/4 | 28th Golden Horse Film Awards第28回金馬奨 | Taiwan | | Q15898734 |
| 12/5 | Inauguration of Leonid Kravchuk | Ukraine | | Q107389834 |
| 12/6 | 1991 Austin yogurt shop murders | United States | Place: Austin | Q4586704 |
| 12/7 | murder of the Zec family | Croatia | Place: Zagreb | Q6938113 |
| 12/7 | Severn Tunnel rail accidentセヴァーントンネル鉄道事故 | United Kingdom | Place: Severn Tunnel | Q975813 |
| 12/8 | Belovezh Accordsベロヴェーシ合意 | Russia, Belarus, Ukraine | Place: Białowieża Forest | Q76986 |
| 12/8 | 1991 Moldovan presidential election | Moldova | | Q6895839 |
| 12/8 | Romanian constitutional referendum, 1991 | Romania | | Q7362592 |
| 12/8 | Puerto Rican constitutional referendum, 1991 | United States | | Q7258618 |
| 12/10 | Nagorno-Karabakh independence referendum1991年ナゴルノ・カラバフ独立住民投票 | Republic of Artsakh | | Q3537730 |
| 12/11 | Paulin Dvor massacre | Croatia | Place: Paulin Dvor | Q12639984 |
| 12/11 | Gornje Jame massacre | Croatia | | Q12639972 |
| 12/11 | December 11, 19911991年12月11日 | Unknown | | Q69299147 |
| 12/12 | Nunn–Lugar Cooperative Threat Reductionナン・ルーガー計画 | Unknown | | Q647988 |
| 12/13 | Voćin massacre | Croatia | Place: Voćin | Q2613862 |
| 12/14 | 1991 Katsina State gubernatorial election | Nigeria | | Q106819339 |
| 12/14 | 1991 Sokoto State gubernatorial election | Nigeria | | Q106959235 |
| 12/14 | 1991 Yobe State gubernatorial election | Nigeria | | Q107015970 |
| 12/14 | 1991 Taraba State gubernatorial election | Nigeria | | Q107027055 |
| 12/14 | 1991 Lagos State gubernatorial election | Nigeria | | Q107104316 |
| 12/14 | 1991 Kano State gubernatorial election | Nigeria | | Q106770916 |
| 12/14 | 1991 Kaduna State gubernatorial election | Nigeria | | Q106808922 |
| 12/14 | 1991 Kebbi State gubernatorial election | Nigeria | | Q106900887 |
| 12/14 | 1991 Enugu State gubernatorial election | Nigeria | | Q107104279 |
| 12/14 | 1991 Delta State gubernatorial election | Nigeria | | Q107104286 |
| 12/14 | 1991 Abia State gubernatorial election | Nigeria | | Q107104287 |
| 12/14 | 1991 Osun State gubernatorial election | Nigeria | | Q107104291 |
| 12/14 | 1991 Edo State gubernatorial election | Nigeria | | Q107104292 |
| 12/14 | 1991 Akwa Ibom State gubernatorial election | Nigeria | | Q107104298 |
| 12/14 | 1991 Imo State gubernatorial election | Nigeria | | Q107104299 |
| 12/14 | 1991 Oyo State gubernatorial election | Nigeria | | Q107104300 |
| 12/14 | 1991 Benue State gubernatorial election | Nigeria | | Q107104304 |
| 12/14 | 1991 Niger State gubernatorial election | Nigeria | | Q107104305 |
| 12/14 | 1991 Jigawa State gubernatorial election | Nigeria | | Q107104307 |
| 12/14 | 1991 Ogun State gubernatorial election | Nigeria | | Q107104308 |
| 12/14 | 1991 Adamawa State gubernatorial election | Nigeria | | Q107104311 |
| 12/14 | 1991 Ondo State gubernatorial election | Nigeria | | Q107104313 |
| 12/14 | 1991 Bauchi State gubernatorial election | Nigeria | | Q107104317 |
| 12/14 | 1991 Borno State gubernatorial election | Nigeria | | Q107104318 |
| 12/14 | 1991 Plateau State gubernatorial election | Nigeria | | Q107104320 |
| 12/14 | 1991 Anambra State gubernatorial election | Nigeria | | Q107104337 |
| 12/14 | 1991 Kwara State gubernatorial election | Nigeria | | Q107104339 |
| 12/14 | 1991 Kogi State gubernatorial election | Nigeria | | Q107104288 |
| 12/14 | 1991 Rivers State gubernatorial election | Nigeria | | Q107104327 |
| 12/14 | 1991 Cross River State gubernatorial election | Nigeria | | Q107104340 |
| 12/15 | Jamilli massacre | Azerbaijan | Place: Cəmilli | Q121072300 |
| 12/16 | Joševica massacre | Croatia | | Q3512544 |
| 12/16 | 1991 Trinidad and Tobago general election | Trinidad and Tobago | | Q7842464 |
| 12/17 | December 17, 19911991年12月17日 | Unknown | | Q69299154 |
| 12/18 | 1991 killings of Serbs in Novska | Croatia | | Q112317351 |
| 12/18 | December 18, 19911991年12月18日 | Unknown | | Q64852951 |
| 12/21 | Vrsar Bombing | Unknown | Place: Vrsar | Q104923397 |
| 12/21 | Bruška massacre | Croatia | | Q4979910 |
| 12/21 | 1991 Taiwan National Assembly election1991年中華民国国民大会代表選挙 | Taiwan | | Q7314433 |
| 12/23 | Ferihegy expressway attack | Unknown | | Q1000639 |
| 12/23 | Meshali massacre | Azerbaijan | Place: Meşəli | Q121010662 |
| 12/24 | December 24, 19911991年12月24日 | Unknown | | Q55589415 |
| 12/25 | Çetinkaya assassination store | Turkey | | Q6094649 |
| 12/26 | dissolution of the Soviet Unionソビエト連邦の崩壊 | Soviet Union | Place: Soviet Union | Q5167679 |
| 12/26 | 1991 Algerian legislative election | Algeria | | Q3586959 |
| 12/26 | Declaration of the Council of Republics of the Supreme Soviet of the USSR No. 142-N of 26 December 1991 | Unknown | Place: Almaty | Q11836865 |
| 12/27 | Scandinavian Airlines System Flight 751スカンジナビア航空751便墜落事故 | Sweden | Place: Gottröra | Q1529863 |
| 12/28 | 1991 Nagorno-Karabakh parliamentary election | Republic of Artsakh | | Q16551653 |
| 12/29 | Azerbaijani independence referendum, 19911991年アゼルバイジャン独立住民投票 | Azerbaijan | | Q4832427 |
| 12/29 | Uzbekistani independence election | Uzbek Soviet Socialist Republic | Place: Uzbekistan | Q2945266 |
| 12/29 | China Airlines Flight 358中華航空358便墜落事故 | Unknown | Place: Wanli District | Q704766 |
| 12/29 | 1991 Uzbek presidential election1991年ウズベキスタン大統領選挙 | Uzbekistan | | Q2945275 |
| 12/31 | 42nd NHK Kōhaku Uta GassenJapan第42回NHK紅白歌合戦 | Japan | | Q11601170 |