October 1, 1964
- China
- National Day
- Cyprus
- Cyprus Independence Day
- Hong Kong
- National Day
- Nigeria
- Independence Day
- San Marino
- Cerimonia di investitura dei Capitani Reggenti
October 3, 1964
- China
- National Day
- Germany
- National Holiday
- Honduras
- Soldier's Day
- South Korea
- National Foundation Day
- Malaysia
- Sabah State Governor's Birthday
October 4, 1964
- Brazil
- Election Day
- Lesotho
- Independence Day
- Mozambique
- Peace and Reconciliation Day
October 5, 1964
- Australia
- Labour Day (SA)
- Queen's Birthday (QLD)
- Brazil
- Criação do estado
- Spain
- Nuestra Señora de Guadalupe
- Canary Islands
- Nuestra Señora de Guadalupe
- St. Lucia
- Thanksgiving
- Mozambique
- Public Holiday
- Portugal
- Implantação da República
- Vanuatu
- Constitution Day
October 6, 1964
- Christmas Island
- Territory Day
- Egypt
- Armed Forces Day
October 8, 1964
- People's Republic of Bangladesh
- Durga Puja
- Croatia
- Independence Day
- Peru
- Battle of Angamos
October 9, 1964
- Argentina
- Bridge Day
- St. Barths
- Abolition of Slavery
- Costa Rica
- Columbus Day
- France
- Abolition of Slavery
- South Korea
- Hangul Day
- Sint Maarten
- Constitution Day
- Uganda
- Independence Day
October 11, 1964
- Macedonia
- Revolution Day
October 12, 1964
- Argentina
- Day of Respect for Cultural Diversity
- American Samoa
- Columbus Day
- Brazil
- Our Lady of Aparecida
- Bahamas
- National Heroes' Day
- Belize
- Day of the Americas
- Canada
- Thanksgiving
- Chile
- Columbus Day
- Colombia
- Columbus Day
- Spain
- Fiesta Nacional de España
- Republic of Equatorial Guinea
- Independence Day
- Guam
- Columbus Day
- Honduras
- Columbus Day
- Canary Islands
- Fiesta Nacional de España
- Macedonia
- Revolution Day (substitute day)
- Nicaragua
- Indigenous Resistance Day
- Puerto Rico
- Columbus Day
- Turks & Caicos Islands
- National Heritage Day
- United States of America
- Columbus Day
- Venezuela
- Day of Indigenous Resistance
- U.S. Virgin Islands
- Virgin Islands–Puerto Rico Friendship Day
October 17, 1964
- Haiti
- Anniversary of the death of Dessalines
October 18, 1964
- Azerbaijan
- Independence Day
- United States of America
- Alaska Day
October 19, 1964
- Azerbaijan
- Independence Day (substitute day)
- Brazil
- Dia do Piauí
- Jamaica
- National Heroes Day
- British Virgin Islands
- St. Ursula’s Day
October 23, 1964
- Hungary
- National Day
- Libya
- Liberation Day
- Macedonia
- Day of the Macedonian Revolutionary Struggle
- New Zealand
- Provincial anniversary day
- Thailand
- King Chulalongkorn Day
October 26, 1964
- Austria
- National Holiday
- Cook Islands
- National Gospel Day
- Ireland
- October Bank Holiday
- New Zealand
- Labour Day
October 27, 1964
- St. Vincent & Grenadines
- Independence Day
October 28, 1964
- Cyprus
- National Holiday
- Czech Republic
- Independent Czechoslovak State Day
- Greece
- National Holiday
October 30, 1964
- United States of America
- Nevada Day
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