| Date | Country | Holiday name |
|---|---|---|
| 2031-10-01 |  China | National Day |
| 2031-10-01 | China | Mid-Autumn Festival |
| 2031-10-01 |  Cyprus | Cyprus Independence Day |
| 2031-10-01 |  Hong Kong | National Day |
| 2031-10-01 |  South Korea | Korean Thanksgiving |
| 2031-10-01 |  Nigeria | Independence Day |
| 2031-10-01 |  San Marino | Cerimonia di investitura dei Capitani Reggenti |
| 2031-10-01 |  Taiwan | Mid-Autumn Festival |
| 2031-10-01 |  Ukraine | Defenders of Ukraine Day |
| 2031-10-01 |  Uzbekistan | Teachers and Instructors Day |
| 2031-10-02 | China | National Day |
| 2031-10-02 |  Guinea | Independence Day |
| 2031-10-02 | Hong Kong | The day following the Chinese Mid-Autumn Festival |
| 2031-10-02 |  Israel | Feast of Tabernacles (Sukkot) |
| 2031-10-03 |  Brazil | Mártires de Cunhaú e Uruaçu |
| 2031-10-03 | China | National Day |
| 2031-10-03 |  Germany | National Holiday |
| 2031-10-03 |  Honduras | Soldier's Day |
| 2031-10-03 | South Korea | National Foundation Day |
| 2031-10-04 |  Lesotho | Independence Day |
| 2031-10-04 |  Malaysia | Sabah State Governor's Birthday |
| 2031-10-04 |  Mozambique | Peace and Reconciliation Day |
| 2031-10-05 | Brazil | Criação do estado |
| 2031-10-05 |  Spain | Nuestra Señora de Guadalupe |
| 2031-10-05 | Canary Islands | Nuestra Señora de Guadalupe |
| 2031-10-05 |  Portugal | Implantação da República |
| 2031-10-05 |  Vanuatu | Constitution Day |
| 2031-10-06 |  Australia | Labour Day (SA) |
| 2031-10-06 | Australia | King's Birthday (QLD) |
| 2031-10-06 |  Christmas Island | Territory Day |
| 2031-10-06 |  Egypt | Armed Forces Day |
| 2031-10-06 |  St. Lucia | Thanksgiving |
| 2031-10-08 |  People's Republic of Bangladesh | Durga Puja |
| 2031-10-08 |  Peru | Battle of Angamos |
| 2031-10-09 |  St. Barths | Abolition of Slavery |
| 2031-10-09 |  France | Abolition of Slavery |
| 2031-10-09 | South Korea | Hangul Day |
| 2031-10-09 |  Sint Maarten | Constitution Day |
| 2031-10-09 |  Uganda | Independence Day |
| 2031-10-09 | Israel | Simchat Torah/ Shmini Atzeret |
| 2031-10-10 |  Austria | Tag der Volksabstimmung |
| 2031-10-10 |  Cuba | Independence Day |
| 2031-10-10 |  Curaçao | Curaçao Day |
| 2031-10-10 |  Fiji | Fiji Day |
| 2031-10-10 |  Kenya | Moi Day |
| 2031-10-10 |  Suriname | Day of the Maroons |
| 2031-10-10 | Taiwan | National Day / Double Tenth Day |
| 2031-10-11 | Brazil | Criação do estado |
| 2031-10-11 |  Macedonia | Revolution Day |
| 2031-10-11 | Malaysia | Sarawak State Governor's Birthday |
| 2031-10-12 | Brazil | Our Lady of Aparecida |
| 2031-10-12 |  Bahamas | National Heroes' Day |
| 2031-10-12 |  Chile | Columbus Day |
| 2031-10-12 |  Costa Rica | Columbus Day |
| 2031-10-12 | Spain | Fiesta Nacional de España |
| 2031-10-12 |  Republic of Equatorial Guinea | Independence Day |
| 2031-10-12 | Honduras | Columbus Day |
| 2031-10-12 | Canary Islands | Fiesta Nacional de España |
| 2031-10-12 |  Nicaragua | Indigenous Resistance Day |
| 2031-10-12 |  Venezuela | Day of Indigenous Resistance |
| 2031-10-13 |  Argentina | Day of Respect for Cultural Diversity |
| 2031-10-13 |  American Samoa | Columbus Day |
| 2031-10-13 |  Burundi | Rwagasore Day |
| 2031-10-13 | Bahamas | National Heroes' Day (substitute day) |
| 2031-10-13 |  Belize | Day of the Americas |
| 2031-10-13 |  Canada | Thanksgiving |
| 2031-10-13 |  Colombia | Columbus Day |
| 2031-10-13 | Republic of Equatorial Guinea | Independence Day (substitute day) |
| 2031-10-13 |  Guam | Columbus Day |
| 2031-10-13 |  Japan | Sports Day |
| 2031-10-13 |  Puerto Rico | Columbus Day |
| 2031-10-13 |  Turks & Caicos Islands | National Heritage Day |
| 2031-10-13 |  Thailand | King Bhumibol Adulyadej Memorial Day |
| 2031-10-13 |  United States of America | Columbus Day |
| 2031-10-13 | United States of America | Indigenous Peoples' Day (VT) |
| 2031-10-13 | United States of America | Native American Day (SD) |
| 2031-10-13 |  U.S. Virgin Islands | Virgin Islands–Puerto Rico Friendship Day |
| 2031-10-14 |  Georgia | Svetitskhovloba |
| 2031-10-14 |  Moldova | Capital's Day |
| 2031-10-14 |  Tanzania | Nyerere Day |
| 2031-10-14 |  Cambodia | Pchum Ben Day |
| 2031-10-15 |  Malawi | Mother's Day |
| 2031-10-15 |  Tunisia | عيد الجلاء |
| 2031-10-15 | Cambodia | HM King Norodom Sihanouk Mourning Day; Pchum Ben Day |
| 2031-10-16 | Cambodia | Pchum Ben Day |
| 2031-10-17 |  Haiti | Anniversary of the death of Dessalines |
| 2031-10-18 |  Azerbaijan | Independence Day |
| 2031-10-18 | United States of America | Alaska Day |
| 2031-10-19 |  Albania | Mother Teresa Day |
| 2031-10-19 | Brazil | Dia do Piauà |
| 2031-10-20 | Albania | Mother Teresa Day (substitute day) |
| 2031-10-20 | Azerbaijan | Independence Day (substitute day) |
| 2031-10-20 |  Guatemala | Revolution Day |
| 2031-10-20 |  Jamaica | National Heroes Day |
| 2031-10-20 | Kenya | Mashujaa Day |
| 2031-10-20 |  British Virgin Islands | St. Ursula’s Day |
| 2031-10-21 | Burundi | Ndadaye Day |
| 2031-10-21 | Honduras | Armed forces Day |
| 2031-10-23 |  Hungary | National Day |
| 2031-10-23 |  Libya | Liberation Day |
| 2031-10-23 | Macedonia | Day of the Macedonian Revolutionary Struggle |
| 2031-10-23 | Thailand | King Chulalongkorn Day |
| 2031-10-24 | Hong Kong | Chung Yeung Festival |
| 2031-10-24 |  New Zealand | Provincial anniversary day |
| 2031-10-24 | Venezuela | Natalicio de Rafael Urdaneta |
| 2031-10-24 |  Zambia | Independence Day |
| 2031-10-25 |  Grenada | Thanksgiving Day |
| 2031-10-25 |  Kazakhstan | Republic Day |
| 2031-10-26 | Austria | National Holiday |
| 2031-10-26 |  Cook Islands | National Gospel Day |
| 2031-10-27 | Cook Islands | National Gospel Day (substitute day) |
| 2031-10-27 |  Ireland | October Bank Holiday |
| 2031-10-27 | New Zealand | Labour Day |
| 2031-10-27 |  St. Vincent & Grenadines | Independence Day |
| 2031-10-27 | Kazakhstan | Republic Day (observed) |
| 2031-10-28 | Cyprus | National Holiday |
| 2031-10-28 |  Czech Republic | Independent Czechoslovak State Day |
| 2031-10-28 |  Greece | National Holiday |
| 2031-10-29 |  Turkey | Republic Day |
| 2031-10-29 | Vanuatu | Jour de l'Unité |
| 2031-10-29 | Cambodia | HM King Norodom Sihamoni's Coronation Day |
| 2031-10-29 |  Iran | Birthday of Imam Ali |
| 2031-10-31 | Chile | Reformation Day |
| 2031-10-31 | Germany | Reformation Day |
| 2031-10-31 |  Slovenia | Reformation Day |
| 2031-10-31 | United States of America | Nevada Day (NV) |
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