October 4, 1983
- Lesotho
- Independence Day
- Mozambique
- Peace and Reconciliation Day
October 5, 1983
- Brazil
- Criação do estado
- Spain
- Nuestra Señora de Guadalupe
- Canary Islands
- Nuestra Señora de Guadalupe
- Portugal
- Implantação da República
- Vanuatu
- Constitution Day
October 6, 1983
- Christmas Island
- Territory Day
- Egypt
- Armed Forces Day
October 7, 1983
- Argentina
- Bridge Day
- Jordan
- Islamic New Year (estimated)
- Kuwait
- Islamic New Year (estimated)
- United Arab Emirates
- Islamic New Year
- Bosnia and Herzegovina
- Islamic New Year
- Bahrain
- Islamic New Year
- Brunei
- Islamic New Year
- Cocos (Keeling) Islands
- Islamic New Year
- Djibouti
- Islamic New Year
- Algeria
- Islamic New Year
- Egypt
- Islamic New Year
- Western Sahara
- Islamic New Year
- Indonesia
- Islamic New Year
- Comoros
- Islamic New Year
- Libya
- Islamic New Year
- Kingdom of Morocco
- Islamic New Year
- Mauritania
- Islamic New Year
- Malaysia
- Islamic New Year
- Republic of the Niger
- Islamic New Year
- Nigeria
- Islamic New Year
- Sudan
- Islamic New Year
- Somalia
- Islamic New Year
- Tunisia
- Islamic New Year
October 8, 1983
- People's Republic of Bangladesh
- Durga Puja
- Croatia
- Independence Day
- Malaysia
- Sarawak State Governor's Birthday
- Peru
- Battle of Angamos
October 9, 1983
- St. Barths
- Abolition of Slavery
- France
- Abolition of Slavery
- South Korea
- Hangul Day
- Sint Maarten
- Constitution Day
- Uganda
- Independence Day
October 10, 1983
- Argentina
- Day of Respect for Cultural Diversity
- American Samoa
- Columbus Day
- Austria
- Tag der Volksabstimmung
- Belize
- Day of the Americas
- Canada
- Thanksgiving
- Chile
- Columbus Day
- Cuba
- Independence Day
- Curaçao
- Curaçao Day
- Fiji
- Fiji Day
- Guam
- Columbus Day
- Japan
- Sports Day
- Kenya
- Moi Day
- Puerto Rico
- Columbus Day
- Suriname
- Day of the Maroons
- Turks & Caicos Islands
- National Heritage Day
- Taiwan
- National Day / Double Tenth Day
- United States of America
- Columbus Day
- U.S. Virgin Islands
- Virgin Islands–Puerto Rico Friendship Day
October 12, 1983
- Brazil
- Our Lady of Aparecida
- Bahamas
- National Heroes' Day
- Costa Rica
- Columbus Day
- Spain
- Fiesta Nacional de España
- Republic of Equatorial Guinea
- Independence Day
- Honduras
- Columbus Day
- Canary Islands
- Fiesta Nacional de España
- Nicaragua
- Indigenous Resistance Day
- Venezuela
- Day of Indigenous Resistance
October 16, 1983
- Vatican City
- Anniversary of the election of Pope John Paul II
- People's Republic of Bangladesh
- Day of Ashura
- Bahrain
- Day of Ashura
- Algeria
- Day of Ashura
- The Gambia
- Day of Ashura
- Iran
- Ashoura
- Senegal
- Day of Ashura
October 18, 1983
- Azerbaijan
- Independence Day
- United States of America
- Alaska Day
October 19, 1983
- Brazil
- Dia do Piauí
October 21, 1983
- Burundi
- Ndadaye Day
- Honduras
- Armed forces Day
- New Zealand
- Provincial anniversary day
- British Virgin Islands
- St. Ursula’s Day
October 24, 1983
- Macedonia
- Day of the Macedonian Revolutionary Struggle (substitute day)
- New Zealand
- Labour Day
- Venezuela
- Natalicio de Rafael Urdaneta
- Zambia
- Independence Day
October 25, 1983
- Grenada
- Thanksgiving Day
October 26, 1983
- Austria
- National Holiday
- Cook Islands
- National Gospel Day
October 27, 1983
- St. Vincent & Grenadines
- Independence Day
October 28, 1983
- Cyprus
- National Holiday
- Czech Republic
- Independent Czechoslovak State Day
- Greece
- National Holiday
- United States of America
- Nevada Day
October 31, 1983
- Chile
- Reformation Day
- Germany
- Reformation Day
- Ireland
- October Bank Holiday
- New Zealand
- Provincial anniversary day
- Slovenia
- Reformation Day
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