| Thu, October 1 | International Coffee Day | - | Weird |
| Thu, October 1 | Children´s Day | El salvador | Observance |
| Thu, October 1 | Cyprus Independence Day | Cyprus | National Holiday |
| Thu, October 1 | Chuuk Constitution Day | Micronesia | Local Holiday |
| Thu, October 1 | World Vegetarian Day | - | International |
| Thu, October 1 | National Day of the People's Republic of China | Multiple [Show] | Multiple Types |
| Thu, October 1 | International Day of Older Persons | - | International |
| Thu, October 1 | Mid-Autumn Festival Day 2 | South korea | National Holiday |
| Thu, October 1 | Armed Forces Day | South korea | Observance |
| Thu, October 1 | Independence Day | Palau | Public Holiday |
| Thu, October 1 | National Day | Multiple [Show] | Multiple Types |
| Thu, October 1 | Mid-Autumn Festival | Multiple [Show] | National Holiday |
| Thu, October 1 | Elders' Day | Mongolia | Observance |
| Thu, October 1 | Teachers Day | Uzbekistan | Public Holiday |
| Thu, October 1 | Independence of Southern British Cameroons from UK | Cameroon | Observance |
| Thu, October 1 | Investiture Ceremony of the Captains Regent 2 | San marino | National Holiday |
| Thu, October 1 | German Food Bank Day | Germany | Observance |
| Thu, October 1 | Black History Month | United kingdom | Monthly |
| Fri, October 2 | Day after the Mid-Autumn-Festival | Macau | Public Holiday |
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| Fri, October 2 | International Day of Non-Violence | - | International |
| Fri, October 2 | Mid-Autumn Festival Day 3 | South korea | National Holiday |
| Fri, October 2 | Day after Mid-Autumn Festival | Hong kong | National Holiday |
| Fri, October 2 | National Day Golden Week holiday | China | National Holiday |
| Fri, October 2 | Independence Day | Guinea | Public Holiday |
| Sat, October 3 | National Foundation Day | South korea | National Holiday |
| Sat, October 3 | Iraqi Independence Day | Iraq | National Holiday |
| Sat, October 3 | First day of Sukkot | Multiple [Show] | Jewish Holiday |
| Sat, October 3 | Daylight Saving Time starts | Australia | Clock Change/daylight Saving Time |
| Sat, October 3 | First Day of Sukkot | Multiple [Show] | Jewish Holiday |
| Sat, October 3 | Morazan´s Day | Honduras | National Holiday |
| Sat, October 3 | National Day Golden Week holiday | China | National Holiday |
| Sat, October 3 | Sukkot I | Israel | National Holiday, Hebrew |
| Sat, October 3 | Wine Day (Day 1) | Moldova | Observance |
| Sat, October 3 | Day of German Unity | Germany | National Holiday |
| Sat, October 3 | National Boyfriend Day | - | |
| Sun, October 4 | Teacher's Day | Ukraine | Observance |
| Sun, October 4 | Feast of St Francis of Assisi | Multiple [Show] | Christian |
| Sun, October 4 | National Day Golden Week holiday | China | Common Local Holidays |
| Sun, October 4 | Daylight Saving Time starts | Paraguay | Clock Change/daylight Saving Time |
| Sun, October 4 | Sukkot II | Israel | Observance, Hebrew |
| Sun, October 4 | Peace and Reconciliation Day | Mozambique | Public Holiday |
| Sun, October 4 | Wine Day (Day 2) | Moldova | Observance |
| Sun, October 4 | Independence Day | Lesotho | Public Holiday |
| Sun, October 4 | World Animal Day | - | Weird |
| Sun, October 4 | National Vodka Day | - | Weird |
| Mon, October 5 | World Teachers' Day | - | International |
| Mon, October 5 | World Habitat Day | - | International |
| Mon, October 5 | Constitution Day | Vanuatu | Public Holiday |
| Mon, October 5 | Republic Implantation | Portugal | National Holiday |
| Mon, October 5 | Queen's Birthday | Australia (Queensland) | Common State Holiday |
| Mon, October 5 | Labour Day | Australia (Act , Nsw , Sa) | Common State Holiday |
| Mon, October 5 | Child Health Day | United states | Observance |
| Mon, October 5 | Thanksgiving Day | Saint lucia | Public Holiday |
| Mon, October 5 | Peat Cutting Monday | Falkland islands | Public Holiday |
| Mon, October 5 | National Day Golden Week holiday | China | Common Local Holidays |
| Mon, October 5 | Sukkot III | Israel | Observance, Hebrew |
| Tue, October 6 | Day of Commemoration and National Mourning | Turkmenistan | Public Holiday |
| Tue, October 6 | Armed Forces Day | Egypt | National Holiday |
| Tue, October 6 | National Day Golden Week holiday | China | Common Local Holidays |
| Tue, October 6 | Sukkot IV | Israel | Observance, Hebrew |
| Tue, October 6 | October Liberation Day | Syria | Public Holiday |
| Tue, October 6 | Dukla Pass Victims Day | Slovakia | Observance |
| Wed, October 7 | World Cerebral Palsy Day | - | International |
| Wed, October 7 | National Day Golden Week holiday | China | Common Local Holidays |
| Wed, October 7 | Sukkot V | Israel | Observance, Hebrew |
| Wed, October 7 | Space Exploration Day | Germany | Observance |
| Thu, October 8 | Battle of Angamos | Peru | National Holiday |
| Thu, October 8 | Independence Day | Croatia | National Holiday |
| Thu, October 8 | World Sight Day | - | International |
| Thu, October 8 | Arbaeen | Iran | National Holiday |
| Thu, October 8 | Sukkot VI | Israel | Observance, Hebrew |
| Fri, October 9 | World Post Day | - | International |
| Fri, October 9 | Hangeul Proclamation Day | South korea | National Holiday |
| Fri, October 9 | Abolition Day | St. barts | Public Holiday |
| Fri, October 9 | Last day of Sukkot | Multiple [Show] | Jewish Holiday |
| Fri, October 9 | Last Day of Sukkot | Multiple [Show] | Jewish Holiday |
| Fri, October 9 | Leif Erikson Day | United states | Observance |
| Fri, October 9 | Independence of Guayaquil | Ecuador | National Holiday |
| Fri, October 9 | Sukkot VII/Hoshanah Rabah | Israel | Observance, Hebrew |
| Fri, October 9 | National Day/Double Tenth Day observed | Taiwan | National Holiday |
| Fri, October 9 | Independence Day | Uganda | Public Holiday |
| Fri, October 9 | Day of the Valencian Community | Spain (Valencia) | Local Holiday |
| Sat, October 10 | Curaçao Day | Curacao | Public Holiday |
| Sat, October 10 | Beginning of the War of Independence | Cuba | National Holiday |
| Sat, October 10 | World Mental Health Day | - | International |
| Sat, October 10 | Shmini Atzeret | Multiple [Show] | Jewish Holiday |
| Sat, October 10 | Fiji Day | Fiji | Public Holiday |
| Sat, October 10 | Day of the Maroons | Suriname | Public Holiday |
| Sat, October 10 | Party Foundation Day | North korea | Public Holiday |
| Sat, October 10 | Shmini Atzeret/Simchat Torah | Israel | National Holiday, Hebrew |
| Sat, October 10 | National Day/Double Tenth Day | Taiwan | National Holiday |
| Sun, October 11 | Day of People’s Uprising | Macedonia, republic of | National Holiday |
| Sun, October 11 | International Day of the Girl Child | - | International |
| Sun, October 11 | Simchat Torah | Multiple [Show] | Jewish Holiday |
| Sun, October 11 | National Coming Out Day | - | |
| Sun, October 11 | Pastor Appreciation Day | - | Weird |
| Mon, October 12 | Columbus Day | Multiple [Show] | Multiple Types |
| Mon, October 12 | Pan American Day | Belize | Public Holiday |
| Mon, October 12 | Day of respect for cultural diversity | Argentina | National Holiday |
| |
| Mon, October 12 | Day of the Cultures | Costa rica | Observance |
| Mon, October 12 | National Heroes Day | The bahamas | Public Holiday |
| Mon, October 12 | Constitution Day | Sint maarten | Public Holiday |
| Mon, October 12 | National Heritage Day | Turks and caicos islands | Public Holiday |
| Mon, October 12 | Native Americans' Day | United states (South Dakota) | Local Observance |
| Mon, October 12 | Indigenous People's Day | United states (Ca* , Mn* , Wa*) | Local Observance |
| Mon, October 12 | Dia de la raza | Guatemala | National Holiday |
| Mon, October 12 | Indigenous Resistance Day | Nicaragua | Observance |
| Mon, October 12 | Thanksgiving Day | Canada (Nb , Nl , Ns , Pe) | Multiple Types |
| Mon, October 12 | Indigenous Resistance´s Day | Multiple [Show] | Multiple Types |
| Mon, October 12 | Our Lady Aparecida/Children's Day | Brazil | National Holiday |
| Mon, October 12 | Virgin Islands - Puerto Rico Friendship Day (Columbus Day) | Us virgin islands | Observance |
| Mon, October 12 | Sports Day | Japan | National Holiday |
| Mon, October 12 | Mother's Day | Malawi | Observance |
| Mon, October 12 | Hispanic Day | Spain | National Holiday |
| Mon, October 12 | Independence Day | Equatorial guinea | National Holiday |
| Tue, October 13 | Navy Birthday | United states | Observance |
| Tue, October 13 | Prince Louis Rwagasore Day | Burundi | Public Holiday |
| Tue, October 13 | National No Bra Day | - | Weird |
| Wed, October 14 | Defenders' Day | Ukraine | National Holiday |
| Wed, October 14 | International Day for Natural Disaster Reduction | - | International |
| Wed, October 14 | Revolution Day | Yemen | Public Holiday |
| Wed, October 14 | Svetitskhovloba | Georgia | Public Holiday |
| Wed, October 14 | Mwalimu Nyerere Day | Tanzania | Public Holiday |
| Wed, October 14 | National Dessert Day | - | Weird |
| Thu, October 15 | International Day of Rural Women | - | International |
| Thu, October 15 | Commemoration Day of King's Father | Cambodia | Public Holiday |
| Thu, October 15 | White Cane Safety Day | United states | Observance |
| Thu, October 15 | Teacher's Day | Brazil | Observance |
| Thu, October 15 | Evacuation Day | Tunisia | Public Holiday |
| Fri, October 16 | World Food Day | - | International |
| Fri, October 16 | Boss's Day | United states | Observance |
| Sat, October 17 | International Day for the Eradication of Poverty | - | International |
| Sat, October 17 | Navaratri | Multiple [Show] | Hindu Holiday |
| Sat, October 17 | Dessalines Day | Haiti | National/legal Holiday |
| Sat, October 17 | Martyrdom of Imam Reza | Iran | National Holiday |
| Sat, October 17 | Sweetest Day | - | |
| Sat, October 17 | National Pasta Day | - | Weird |
| Sun, October 18 | Alaska Day | United states (Alaska) | State Holiday |
| Sun, October 18 | Healthcare Aide Day | Canada (British Columbia, Manitoba) | Observance |
| Mon, October 19 | National Heroes' Day | Jamaica | Public Holiday |
| Mon, October 19 | Alaska Day observed | United states (Alaska) | State Holiday |
| Mon, October 19 | Mother Teresa Beatification Day | Albania | National Holiday |
| Tue, October 20 | Birth of the Guru Granth | - | Sikh |
| Tue, October 20 | Revolution of 1944 | Guatemala | National Holiday |
| Tue, October 20 | Vietnamese Women's Day | Vietnam | Observance |
| Tue, October 20 | Mashujaa Day | Kenya | Public Holiday |
| Wed, October 21 | Saint Ursula's Day | British virgin islands | Public Holiday |
| Wed, October 21 | Chong Yeung Festival (Festival of Ancestors) | Macau | Public Holiday |
| Wed, October 21 | Army Day | Honduras | National Holiday |
| Wed, October 21 | President Ndadaye's Day | Burundi | Public Holiday |
| Wed, October 21 | Overseas Chinese Day | Taiwan | Observance |
| Wed, October 21 | World War II Victims Remembrance Day | Serbia | Observance |
| Wed, October 21 | Apple Day | - | Weird |
| Thu, October 22 | Ashoora | Bahrain | Public Holiday |
| Thu, October 22 | National Nut Day | - | Weird |
| Fri, October 23 | Day of the Macedonian Revolutionary Struggle | Macedonia, republic of | National Holiday |
| Fri, October 23 | Paris Peace Agreement's Day | Cambodia | Observance |
| Fri, October 23 | Ashoora (second day) | Bahrain | Public Holiday |
| Fri, October 23 | Liberation Day | Libya | Public Holiday |
| Fri, October 23 | 1956 Revolution Memorial Day | Hungary | National Holiday |
| Sat, October 24 | United Nations Day | Multiple [Show] | Multiple Types |
| Sat, October 24 | World Development Information Day | - | International |
| Sat, October 24 | Daylight Saving Time ends | Lebanon | Clock Change/daylight Saving Time |
| Sat, October 24 | Independence Day | Zambia | Public Holiday |
| Sat, October 24 | Day of the Libraries | Germany | Observance |
| Sat, October 24 | Make a Difference Day | - | Weird |
| Sun, October 25 | Daylight Saving Time ends | Multiple [Show] | Clock Change/daylight Saving Time |
| Sun, October 25 | Dussehra | Multiple [Show] | Hindu Holiday |
| Sun, October 25 | Double Ninth Festival | China | Observance |
| Sun, October 25 | Thanksgiving | Grenada | Public Holiday |
| Sun, October 25 | Hurricane Thanksgiving | Us virgin islands | Observance |
| Sun, October 25 | Yom HaAliyah School Observance | Israel | Observance |
| Sun, October 25 | Taiwan's Retrocession Day | Taiwan | Observance |
| Sun, October 25 | Double Ninth Day | Taiwan | Observance |
| Sun, October 25 | Sovereignty Day | Slovenia | Observance |
| Mon, October 26 | Angam Day | Nauru | Public Holiday |
| Mon, October 26 | Gospel Day | Cook islands | Public Holiday |
| Mon, October 26 | Chung Yeung Festival | Hong kong | National Holiday |
| Mon, October 26 | Labour Day | New zealand | National Holiday |
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| Mon, October 26 | National Day | Austria | National Holiday |
| Mon, October 26 | October Bank Holiday | Ireland | National Holiday |
| Mon, October 26 | National Pumpkin Day | - | Weird |
| Tue, October 27 | Independence Day | Multiple [Show] | Public Holiday |
| Tue, October 27 | World Day for Audiovisual Heritage | - | International |
| Tue, October 27 | Černová Tragedy Day | Slovakia | Observance |
| Tue, October 27 | National Black Cat Day | - | Weird |
| Wed, October 28 | Ochi Day | Cyprus | National Holiday |
| Wed, October 28 | The Ochi day | Greece | Public Holiday |
| Wed, October 28 | Independent Czechoslovak State Day | Czech republic | National Holiday |
| Wed, October 28 | Republic Day Eve | Turkey | Half Day |
| Wed, October 28 | Public Service Holiday | Brazil | Optional Holiday |
| Wed, October 28 | Establishment of the Independent Czecho-Slovak State | Slovakia | Observance |
| Wed, October 28 | National Chocolate Day | - | Weird |
| Thu, October 29 | World Stroke Day | - | International |
| Thu, October 29 | The Prophet's Birthday | Multiple [Show] | Multiple Types |
| Thu, October 29 | Prophet's Birthday | Multiple [Show] | Multiple Types |
| Thu, October 29 | Maulid un-Nabi | Philippines | Common Local Holidays |
| Thu, October 29 | King's Coronation Day | Cambodia | Public Holiday |
| Thu, October 29 | Republic Day | Turkey | National Holiday |
| Thu, October 29 | Prophet Mohamed's birthday | Egypt | National Holiday |
| Thu, October 29 | The Prophet Muhammad's Birthday | Multiple [Show] | Multiple Types |
| Thu, October 29 | Capital City Day | Mongolia | Observance |
| Thu, October 29 | Daylight Saving Time ends | Syria | Clock Change/daylight Saving Time |
| Thu, October 29 | Id el Maulud | Nigeria | Public Holiday |
| Thu, October 29 | Maouloud | Senegal | Public Holiday |
| Thu, October 29 | Birth of Ľudovít Ŝtúr Day | Slovakia | Observance |
| Thu, October 29 | Mawlid | Benin | Public Holiday |
| Thu, October 29 | National Cat Day | - | |
| Fri, October 30 | Nevada Day | United states (Nevada) | State Holiday |
| Fri, October 30 | All Saints' Eve | Sweden | De Facto Half Holiday |
| Fri, October 30 | Anniversary of the Declaration of the Slovak Nation | Slovakia | Observance |
| Fri, October 30 | Mischief Night | United states | Observance |
| Sat, October 31 | All Hallows Eve | - | Christian |
| Sat, October 31 | Halloween | Multiple [Show] | Observance |
| Sat, October 31 | All Saints' Day | Multiple [Show] | Multiple Types |
| Sat, October 31 | Daylight Saving Time starts | Fiji | Clock Change/daylight Saving Time |
| Sat, October 31 | Reformation Day | Multiple [Show] | Multiple Types |
