| Date | Country | Holiday name |
|---|---|---|
| 1966-10-01 |  China | National Day |
| 1966-10-01 |  Cyprus | Cyprus Independence Day |
| 1966-10-01 |  Hong Kong | National Day |
| 1966-10-01 |  Malaysia | Sabah State Governor's Birthday |
| 1966-10-01 |  Nigeria | Independence Day |
| 1966-10-01 |  San Marino | Cerimonia di investitura dei Capitani Reggenti |
| 1966-10-02 |  Brazil | Election Day |
| 1966-10-02 | China | National Day |
| 1966-10-02 |  Guinea | Independence Day |
| 1966-10-03 |  Australia | Labour Day (SA) |
| 1966-10-03 | Australia | Queen's Birthday (QLD) |
| 1966-10-03 | China | National Day |
| 1966-10-03 |  Germany | National Holiday |
| 1966-10-03 |  Honduras | Soldier's Day |
| 1966-10-03 |  South Korea | National Foundation Day |
| 1966-10-03 |  St. Lucia | Thanksgiving |
| 1966-10-04 |  Lesotho | Independence Day |
| 1966-10-04 |  Mozambique | Peace and Reconciliation Day |
| 1966-10-05 | Brazil | Criação do estado |
| 1966-10-05 |  Spain | Nuestra Señora de Guadalupe |
| 1966-10-05 | Canary Islands | Nuestra Señora de Guadalupe |
| 1966-10-05 |  Portugal | Implantação da República |
| 1966-10-05 |  Vanuatu | Constitution Day |
| 1966-10-06 |  Christmas Island | Territory Day |
| 1966-10-06 |  Egypt | Armed Forces Day |
| 1966-10-07 |  Argentina | Bridge Day |
| 1966-10-08 |  People's Republic of Bangladesh | Durga Puja |
| 1966-10-08 |  Croatia | Independence Day |
| 1966-10-08 | Malaysia | Sarawak State Governor's Birthday |
| 1966-10-08 |  Peru | Battle of Angamos |
| 1966-10-09 |  St. Barths | Abolition of Slavery |
| 1966-10-09 |  France | Abolition of Slavery |
| 1966-10-09 | South Korea | Hangul Day |
| 1966-10-09 |  Sint Maarten | Constitution Day |
| 1966-10-09 |  Uganda | Independence Day |
| 1966-10-10 | Argentina | Day of Respect for Cultural Diversity |
| 1966-10-10 |  American Samoa | Columbus Day |
| 1966-10-10 |  Austria | Tag der Volksabstimmung |
| 1966-10-10 |  Belize | Day of the Americas |
| 1966-10-10 |  Canada | Thanksgiving |
| 1966-10-10 |  Chile | Columbus Day |
| 1966-10-10 |  Cuba | Independence Day |
| 1966-10-10 |  Curaçao | Curaçao Day |
| 1966-10-10 |  Fiji | Fiji Day |
| 1966-10-10 |  Guam | Columbus Day |
| 1966-10-10 |  Japan | Sports Day |
| 1966-10-10 |  Kenya | Moi Day |
| 1966-10-10 |  Puerto Rico | Columbus Day |
| 1966-10-10 |  Suriname | Day of the Maroons |
| 1966-10-10 |  Turks & Caicos Islands | National Heritage Day |
| 1966-10-10 |  Taiwan | National Day / Double Tenth Day |
| 1966-10-10 |  United States of America | Columbus Day |
| 1966-10-10 |  U.S. Virgin Islands | Virgin Islands–Puerto Rico Friendship Day |
| 1966-10-11 |  Macedonia | Revolution Day |
| 1966-10-12 | Brazil | Our Lady of Aparecida |
| 1966-10-12 |  Bahamas | National Heroes' Day |
| 1966-10-12 |  Costa Rica | Columbus Day |
| 1966-10-12 | Spain | Fiesta Nacional de España |
| 1966-10-12 |  Republic of Equatorial Guinea | Independence Day |
| 1966-10-12 | Honduras | Columbus Day |
| 1966-10-12 | Canary Islands | Fiesta Nacional de España |
| 1966-10-12 |  Nicaragua | Indigenous Resistance Day |
| 1966-10-12 |  Venezuela | Day of Indigenous Resistance |
| 1966-10-13 |  Burundi | Rwagasore Day |
| 1966-10-13 |  Thailand | King Bhumibol Adulyadej Memorial Day |
| 1966-10-14 |  Georgia | Svetitskhovloba |
| 1966-10-14 |  Moldova | Capital's Day |
| 1966-10-14 |  Tanzania | Nyerere Day |
| 1966-10-15 |  Malawi | Mother's Day |
| 1966-10-15 |  Tunisia | عيد الجلاء |
| 1966-10-17 |  Colombia | Columbus Day |
| 1966-10-17 |  Haiti | Anniversary of the death of Dessalines |
| 1966-10-17 |  Jamaica | National Heroes Day |
| 1966-10-17 | Malawi | Mother's Day (substitute day) |
| 1966-10-18 |  Azerbaijan | Independence Day |
| 1966-10-18 | United States of America | Alaska Day |
| 1966-10-19 | Brazil | Dia do Piauí |
| 1966-10-20 |  Guatemala | Revolution Day |
| 1966-10-20 | Kenya | Mashujaa Day |
| 1966-10-21 | Burundi | Ndadaye Day |
| 1966-10-21 | Honduras | Armed forces Day |
| 1966-10-21 |  New Zealand | Provincial anniversary day |
| 1966-10-21 |  British Virgin Islands | St. Ursula’s Day |
| 1966-10-22 | Hong Kong | Chung Yeung Festival |
| 1966-10-23 |  Hungary | National Day |
| 1966-10-23 |  Libya | Liberation Day |
| 1966-10-23 | Macedonia | Day of the Macedonian Revolutionary Struggle |
| 1966-10-23 | Thailand | King Chulalongkorn Day |
| 1966-10-24 | Macedonia | Day of the Macedonian Revolutionary Struggle (substitute day) |
| 1966-10-24 | New Zealand | Labour Day |
| 1966-10-24 | Venezuela | Natalicio de Rafael Urdaneta |
| 1966-10-24 |  Zambia | Independence Day |
| 1966-10-25 |  Grenada | Thanksgiving Day |
| 1966-10-26 | Austria | National Holiday |
| 1966-10-26 |  Cook Islands | National Gospel Day |
| 1966-10-27 |  St. Vincent & Grenadines | Independence Day |
| 1966-10-28 | Cyprus | National Holiday |
| 1966-10-28 |  Czech Republic | Independent Czechoslovak State Day |
| 1966-10-28 |  Greece | National Holiday |
| 1966-10-28 | United States of America | Nevada Day |
| 1966-10-29 |  Turkey | Republic Day |
| 1966-10-29 | Vanuatu | Jour de l'Unité |
| 1966-10-30 | Brazil | Election Day |
| 1966-10-31 | Chile | Reformation Day |
| 1966-10-31 | Germany | Reformation Day |
| 1966-10-31 |  Ireland | October Bank Holiday |
| 1966-10-31 | New Zealand | Provincial anniversary day |
| 1966-10-31 |  Slovenia | Reformation Day |
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