| Date | Country | Holiday name |
|---|---|---|
| 2021-10-01 |  China | National Day |
| 2021-10-01 |  Cyprus | Cyprus Independence Day |
| 2021-10-01 |  Hong Kong | National Day |
| 2021-10-01 |  Nigeria | Independence Day |
| 2021-10-01 |  San Marino | Cerimonia di investitura dei Capitani Reggenti |
| 2021-10-01 |  Uzbekistan | Teachers and Instructors Day |
| 2021-10-01 |  Tuvalu | Tuvalu Day |
| 2021-10-01 |  Turkmenistan | International Day of Senior Citizens |
| 2021-10-01 |  Palau | Independence Day |
| 2021-10-01 |  Macau | National Day of the People's Republic of China |
| 2021-10-01 |  Mongolia | Elders' Day |
| 2021-10-01 |  Micronesia | Chuuk Constitution Day |
| 2021-10-02 | China | National Day |
| 2021-10-02 |  Guinea | Independence Day |
| 2021-10-02 |  Malaysia | Sabah State Governor's Birthday |
| 2021-10-02 | Tuvalu | Tuvalu Day Holiday |
| 2021-10-02 | Macau | Day after PRC National Day |
| 2021-10-02 |  India | Mahatma Gandhi Jayanti |
| 2021-10-02 |  Norfolk Island | Daylight Saving Time starts |
| 2021-10-02 |  Australia | Daylight Saving Time starts |
| 2021-10-03 |  Brazil | Mártires de Cunhaú e Uruaçu |
| 2021-10-03 | China | National Day |
| 2021-10-03 |  Germany | National Holiday |
| 2021-10-03 |  Honduras | Soldier's Day |
| 2021-10-03 |  South Korea | National Foundation Day |
| 2021-10-03 |  Oman | Public Holiday |
| 2021-10-03 |  Iraq | Iraqi Independence Day |
| 2021-10-04 |  Australia | Labour Day (SA) |
| 2021-10-04 | Australia | Queen's Birthday (QLD) |
| 2021-10-04 | China | National Day |
| 2021-10-04 |  St. Lucia | Thanksgiving |
| 2021-10-04 |  Lesotho | Independence Day |
| 2021-10-04 |  Mozambique | Peace and Reconciliation Day |
| 2021-10-04 | Tuvalu | Day off for Tuvalu Day Holiday |
| 2021-10-04 | Oman | Public Holiday |
| 2021-10-04 | Macau | PRC National Day Holiday |
| 2021-10-04 |  United Kingdom | Feast of St Francis of Assisi |
| 2021-10-04 | Australia | Feast of St Francis of Assisi |
| 2021-10-04 |  Falkland Islands | Peat Cutting Monday |
| 2021-10-05 | Brazil | Criação do estado |
| 2021-10-05 | China | National Day |
| 2021-10-05 |  Spain | Nuestra Señora de Guadalupe |
| 2021-10-05 | Canary Islands | Nuestra Señora de Guadalupe |
| 2021-10-05 |  Portugal | Implantação da República |
| 2021-10-05 |  Vanuatu | Constitution Day |
| 2021-10-05 |  Cambodia | Pchum Ben Day |
| 2021-10-05 |  Iran | Demise of Prophet Muhammad and Imam Hassan (Mujtaba) |
| 2021-10-06 | China | National Day |
| 2021-10-06 |  Christmas Island | Territory Day |
| 2021-10-06 |  Egypt | Armed Forces Day |
| 2021-10-06 | Cambodia | Pchum Ben Day |
| 2021-10-06 | Turkmenistan | Day of Commemoration and National Mourning |
| 2021-10-06 |  Syria | October Liberation Day |
| 2021-10-07 | China | National Day |
| 2021-10-07 | Cambodia | Pchum Ben Day |
| 2021-10-07 |  Pakistan | First Day of Navaratri |
| 2021-10-07 |  Nepal | Ghatasthapana |
| 2021-10-07 |  Maldives | National Day |
| 2021-10-07 |  Myanmar | Navaratri |
| 2021-10-07 | United Kingdom | Navaratri |
| 2021-10-07 | India | First Day of Sharad Navratri |
| 2021-10-07 | Iran | Martyrdom of Imam Reza |
| 2021-10-08 |  Argentina | Bridge Day |
| 2021-10-08 |  People's Republic of Bangladesh | Durga Puja |
| 2021-10-08 |  Peru | Battle of Angamos |
| 2021-10-08 |  Kiribati | World Teachers' Day |
| 2021-10-09 |  St. Barths | Abolition of Slavery |
| 2021-10-09 |  France | Abolition of Slavery |
| 2021-10-09 | South Korea | Hangul Day |
| 2021-10-09 | Malaysia | Sarawak State Governor's Birthday |
| 2021-10-09 |  Sint Maarten | Constitution Day |
| 2021-10-09 |  Uganda | Independence Day |
| 2021-10-09 | Turkmenistan | Day of Naval Forces of Turkmenistan |
| 2021-10-10 |  Austria | Tag der Volksabstimmung |
| 2021-10-10 |  Cuba | Independence Day |
| 2021-10-10 |  Curaçao | Curaçao Day |
| 2021-10-10 |  Fiji | Fiji Day |
| 2021-10-10 |  Kenya | Moi Day |
| 2021-10-10 |  Suriname | Day of the Maroons |
| 2021-10-10 |  Taiwan | National Day / Double Tenth Day |
| 2021-10-10 |  North Korea | Party Foundation Day |
| 2021-10-11 | Argentina | Day of Respect for Cultural Diversity |
| 2021-10-11 |  American Samoa | Columbus Day |
| 2021-10-11 | Brazil | Criação do estado |
| 2021-10-11 |  Belize | Day of the Americas |
| 2021-10-11 |  Canada | Thanksgiving |
| 2021-10-11 |  Chile | Columbus Day |
| 2021-10-11 | Fiji | Fiji Day (substitute day) |
| 2021-10-11 |  Guam | Columbus Day |
| 2021-10-11 | Kenya | Moi Day (substitute day) |
| 2021-10-11 |  Macedonia | Revolution Day |
| 2021-10-11 |  Puerto Rico | Columbus Day |
| 2021-10-11 |  Turks & Caicos Islands | National Heritage Day |
| 2021-10-11 | Taiwan | National Day / Double Tenth Day (substitute day) |
| 2021-10-11 |  United States of America | Columbus Day |
| 2021-10-11 | United States of America | Indigenous Peoples' Day (VT) |
| 2021-10-11 | United States of America | Native American Day (SD) |
| 2021-10-11 |  U.S. Virgin Islands | Virgin Islands–Puerto Rico Friendship Day |
| 2021-10-11 |  Samoa | Lotu a Tamaiti |
| 2021-10-11 | Norfolk Island | Norfolk Island Agricultural Show Day |
| 2021-10-11 |  Northern Mariana Islands | Commonwealth Cultural Day |
| 2021-10-11 | India | First Day of Durga Puja Festivities |
| 2021-10-12 | Brazil | Our Lady of Aparecida |
| 2021-10-12 |  Bahamas | National Heroes' Day |
| 2021-10-12 |  Costa Rica | Columbus Day |
| 2021-10-12 | Spain | Fiesta Nacional de España |
| 2021-10-12 |  Republic of Equatorial Guinea | Independence Day |
| 2021-10-12 | Honduras | Columbus Day |
| 2021-10-12 | Canary Islands | Fiesta Nacional de España |
| 2021-10-12 |  Nicaragua | Indigenous Resistance Day |
| 2021-10-12 |  Venezuela | Day of Indigenous Resistance |
| 2021-10-12 | Nepal | Phulpati (Dashain) |
| 2021-10-12 | India | Maha Saptami |
| 2021-10-13 |  Burundi | Rwagasore Day |
| 2021-10-13 |  Thailand | King Bhumibol Adulyadej Memorial Day |
| 2021-10-13 | Pakistan | Durga Puja |
| 2021-10-13 | Nepal | Astami (Dashain) |
| 2021-10-13 | India | Maha Ashtami |
| 2021-10-14 |  Georgia | Svetitskhovloba |
| 2021-10-14 | Hong Kong | Chung Yeung Festival |
| 2021-10-14 |  Moldova | Capital's Day |
| 2021-10-14 |  Tanzania | Nyerere Day |
| 2021-10-14 |  Ukraine | Defenders of Ukraine Day |
| 2021-10-14 |  Yemen | Liberation Day |
| 2021-10-14 | Nepal | Nawami (Dashain) |
| 2021-10-14 | Macau | Chong Yeung Festival (Festival of Ancestors) |
| 2021-10-14 | United Kingdom | Dussehra |
| 2021-10-14 | India | Maha Navami |
| 2021-10-14 | Iran | Martyrdom of Imam Hassan |
| 2021-10-15 |  Malawi | Mother's Day |
| 2021-10-15 |  Tunisia | عيد الجلاء |
| 2021-10-15 | Cambodia | HM King Norodom Sihanouk Mourning Day |
| 2021-10-15 | Pakistan | Dussehra |
| 2021-10-15 | Nepal | Dashami (Dashain) |
| 2021-10-15 |  Mauritius | Dussehra |
| 2021-10-15 | Myanmar | Dussehra |
| 2021-10-15 |  Sri Lanka | Dussehra |
| 2021-10-15 | India | Dussehra |
| 2021-10-15 | Australia | International Pregnancy and Infant Loss Remembrance Day |
| 2021-10-15 |  Bhutan | Dashain |
| 2021-10-16 | Nepal | Ekadashi (Dashain) |
| 2021-10-17 |  Haiti | Anniversary of the death of Dessalines |
| 2021-10-17 | Nepal | Duwadashi (Dashain) |
| 2021-10-18 |  Azerbaijan | Independence Day |
| 2021-10-18 |  Colombia | Columbus Day |
| 2021-10-18 |  Jamaica | National Heroes Day |
| 2021-10-18 | United States of America | Alaska Day |
| 2021-10-18 |  British Virgin Islands | Heroes’ and Forefathers Day |
| 2021-10-18 |  Jordan | Prophet's Birthday (estimated) |
| 2021-10-18 |  Kuwait | Prophet's Birthday (estimated) |
| 2021-10-18 | Pakistan | Giarhwin Sharief |
| 2021-10-18 | Yemen | The Prophet's Birthday |
| 2021-10-18 | Maldives | Milad un Nabi (Mawlid) |
| 2021-10-18 |  Lebanon | The Prophet's Birthday |
| 2021-10-18 | Iraq | The Prophet's Birthday |
| 2021-10-18 |  United Arab Emirates | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Bosnia and Herzegovina | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | People's Republic of Bangladesh | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Burkina Faso | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Bahrain | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Benin | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Brunei | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Cocos (Keeling) Islands | Hari Maulaud Nabi |
| 2021-10-18 |  Republic of Côte d'Ivoire | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Djibouti | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Algeria | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Egypt | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Western Sahara | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Eritrea | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Ethiopia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Fiji | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  The Gambia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Guinea | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Guyana | Youman Nabi |
| 2021-10-18 |  Indonesia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Comoros | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Libya | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Kingdom of Morocco | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Republic of Mali | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Mauritania | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Malaysia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Republic of the Niger | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Nigeria | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Sudan | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Sierra Leone | Mawlid |
| 2021-10-18 |  Senegal | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Somalia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 |  Chad | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Tunisia | Birthday of Muhammad (Mawlid) |
| 2021-10-18 | Tanzania | Maulid Day |
| 2021-10-19 |  Albania | Mother Teresa Day |
| 2021-10-19 | Brazil | Dia do Piauà (PI) |
| 2021-10-19 | Pakistan | Eid Milad un-Nabi |
| 2021-10-19 | Syria | The Prophet's Birthday |
| 2021-10-19 | Oman | The Prophet's Birthday |
| 2021-10-19 | Myanmar | Full Moon Day of Thadingyut Holiday (End of Buddhist Lent) |
| 2021-10-19 | Sri Lanka | Milad-Un-Nabi (Holy Prophet's Birthday) |
| 2021-10-19 | United Kingdom | Milad un Nabi (Mawlid) |
| 2021-10-19 | India | Milad un-Nabi/Id-e-Milad |
| 2021-10-19 | Australia | Milad un Nabi (Mawlid) |
| 2021-10-19 |  Afghanistan | The Prophet's Birthday |
| 2021-10-19 |  Togolese Republic | Birthday of Muhammad (Mawlid) |
| 2021-10-20 |  Guatemala | Revolution Day |
| 2021-10-20 | Kenya | Mashujaa Day |
| 2021-10-20 | Pakistan | Birthday of Guru Balmik Sawami Ji |
| 2021-10-20 | Myanmar | Full Moon Day of Thadingyut (End of Buddhist Lent) |
| 2021-10-20 | Sri Lanka | Vap Full Moon Poya Day |
| 2021-10-20 | India | Maharishi Valmiki Jayanti |
| 2021-10-21 | Burundi | Ndadaye Day |
| 2021-10-21 | Honduras | Armed forces Day |
| 2021-10-21 | Myanmar | Full Moon Day of Thadingyut Holiday (End of Buddhist Lent) |
| 2021-10-22 |  New Zealand | Provincial anniversary day |
| 2021-10-23 |  Hungary | National Day |
| 2021-10-23 | Libya | Liberation Day |
| 2021-10-23 | Macedonia | Day of the Macedonian Revolutionary Struggle |
| 2021-10-23 | Thailand | King Chulalongkorn Day |
| 2021-10-23 | Iran | Birthday of Muhammad Prophet |
| 2021-10-24 | Venezuela | Natalicio de Rafael Urdaneta |
| 2021-10-24 |  Zambia | Independence Day |
| 2021-10-24 | Palau | United Nations Day |
| 2021-10-24 | India | Karaka Chaturthi (Karva Chauth) |
| 2021-10-24 | Micronesia | United Nations Day |
| 2021-10-24 |  Norway | United Nations Day |
| 2021-10-25 |  Grenada | Thanksgiving Day |
| 2021-10-25 |  Ireland | October Bank Holiday |
| 2021-10-25 | New Zealand | Labour Day |
| 2021-10-25 | Zambia | Independence Day (substitute day) |
| 2021-10-25 |  New Zealand | Labour Day |
| 2021-10-25 | Palau | Day off for United Nations Day |
| 2021-10-25 | Micronesia | United Nations Day observed |
| 2021-10-26 | Austria | National Holiday |
| 2021-10-26 |  Cook Islands | National Gospel Day |
| 2021-10-26 |  Nauru | Angam Day |
| 2021-10-27 |  St. Vincent & Grenadines | Independence Day |
| 2021-10-27 | Bhutan | Descending Day of Lord Buddha |
| 2021-10-28 | Cyprus | National Holiday |
| 2021-10-28 |  Czech Republic | Independent Czechoslovak State Day |
| 2021-10-28 |  Greece | National Holiday |
| 2021-10-28 | Syria | Daylight Saving Time ends |
| 2021-10-29 |  Turkey | Republic Day |
| 2021-10-29 | United States of America | Nevada Day |
| 2021-10-29 | Vanuatu | Jour de l'Unité |
| 2021-10-29 | Cambodia | HM King Norodom Sihamoni's Coronation Day |
| 2021-10-29 | Mongolia | Capital City Day |
| 2021-10-30 | Lebanon | Daylight Saving Time ends |
| 2021-10-31 | Chile | Reformation Day |
| 2021-10-31 | Germany | Reformation Day |
| 2021-10-31 |  Slovenia | Reformation Day |
| 2021-10-31 | New Zealand | Halloween |
| 2021-10-31 | United Kingdom | Halloween |
| 2021-10-31 | India | Halloween |
| 2021-10-31 | Australia | Halloween |
| 2021-10-31 | Norway | Repentance Day |
| 2021-10-31 | Norway | Halloween |
| 2021-10-31 | United Kingdom | Daylight Saving Time ends |
| 2021-10-31 | Norway | Daylight Saving Time ends |
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