September 3, 1983
- San Marino
- The Feast of San Marino and the Republic
September 5, 1983
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Brazil
- Elevação do Amazonas à categoria de província
- Canada
- Labour Day
- Guam
- Labour Day
- Puerto Rico
- Labour Day
- Swaziland
- Umhlanga Reed Dance
- United States of America
- Labour Day
- U.S. Virgin Islands
- Labour Day
September 6, 1983
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
September 7, 1983
- Brazil
- Independence Day
- Spain
- La Bajada de la Virgen del Socorro
- Fiji
- Constitution Day
- Canary Islands
- La Bajada de la Virgen del Socorro
- Mozambique
- Lusaka Peace Agreement
September 8, 1983
- Andorra
- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais
- Switzerland
- Jeûne Genevois
- Spain
- Día de Asturias (AS)
- Nuestra Señora del Pino (CN)
- Día de Extremadura (EX)
- Canary Islands
- Nuestra Señora del Pino
- Lichtenstein
- Mariä Geburt
- Macedonia
- Independence Day
- Malta
- Victory Day
- Vatican City
- Nativity of Mary
- Israel
- Rosh Hashanah (Yom Teruah)
September 9, 1983
- Israel
- Rosh Hashanah (Day 2)
September 12, 1983
- Cape Verde
- National Day
September 13, 1983
- Brazil
- Criação do Território Federal
- United States of America
- Primary Election Day
September 15, 1983
- Costa Rica
- Independence Day
- Spain
- La Bien Aparecida (CB)
- Nuestra Señora de los Dolores (CN)
- Guatemala
- Independence Day
- Honduras
- Independence Day
- Canary Islands
- Nuestra Señora de los Dolores
- Japan
- Respect-for-the-Aged Day
- Nicaragua
- Independence Day
- Slovakia
- Day of Our Lady of the Seven Sorrows
- El Salvador
- Independence Day
September 16, 1983
- Brazil
- Emancipação política
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Arafat Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Arafat Day (11)
- Jordan
- Arafat Day (estimated)
- Kuwait
- Arafat Day (estimated)
- Saudi Arabia
- Arafat Day (estimated)
- Papua New Guinea
- Independence Day
- Bahrain
- Arafat Day
- Djibouti
- Arafat Day
- Spain
- Arafat Day
September 17, 1983
- Angola
- National Hero Day
- Jordan
- Eid al-Adha (estimated)
- Kuwait
- Eid al-Adha (estimated)
- Saudi Arabia
- Eid al-Adha Holiday (estimated)
- United Arab Emirates
- Feast of the Sacrifice (Eid al-Adha)
- Albania
- Feast of the Sacrifice (Eid al-Adha)
- Azerbaijan
- Feast of the Sacrifice (Eid al-Adha)
- Bosnia and Herzegovina
- Feast of the Sacrifice (Eid al-Adha)
- People's Republic of Bangladesh
- Feast of the Sacrifice (Eid al-Adha)
- Burkina Faso
- Feast of the Sacrifice (Eid al-Adha)
- Bahrain
- Feast of the Sacrifice (Eid al-Adha)
- Burundi
- Feast of the Sacrifice (Eid al-Adha)
- Benin
- Feast of the Sacrifice (Eid al-Adha)
- Brunei
- Feast of the Sacrifice (Eid al-Adha)
- Cocos (Keeling) Islands
- Hari Raya Haji
- Central African Republic
- Feast of the Sacrifice (Eid al-Adha)
- Republic of Côte d'Ivoire
- Feast of the Sacrifice (Eid al-Adha)
- Cameroon
- Feast of the Sacrifice (Eid al-Adha)
- Christmas Island
- Feast of the Sacrifice (Eid al-Adha)
- Djibouti
- Feast of the Sacrifice (Eid al-Adha)
- Algeria
- Feast of the Sacrifice (Eid al-Adha)
- Egypt
- Feast of the Sacrifice (Eid al-Adha)
- Western Sahara
- Feast of the Sacrifice (Eid al-Adha)
- Eritrea
- Feast of the Sacrifice (Eid al-Adha)
- Spain
- Feast of the Sacrifice (Eid al-Adha)
- Ethiopia
- Feast of the Sacrifice (Eid al-Adha)
- Gabon
- Feast of the Sacrifice (Eid al-Adha)
- Ghana
- Feast of the Sacrifice (Eid al-Adha)
- The Gambia
- Tabaski
- Guinea
- Feast of the Sacrifice (Eid al-Adha)
- Guinea-Bissau
- Feast of the Sacrifice (Eid al-Adha)
- Guyana
- Eid Ul Adha
- Indonesia
- Feast of the Sacrifice (Eid al-Adha)
- Israel
- Day of Atonement (Yom Kippur)
- Iran
- Feast of the Sacrifice (Eid al-Adha)
- Kenya
- Feast of the Sacrifice (Eid al-Adha)
- Comoros
- Feast of the Sacrifice (Eid al-Adha)
- Libya
- Feast of the Sacrifice (Eid al-Adha)
- Kingdom of Morocco
- Feast of the Sacrifice (Eid al-Adha)
- Montenegro
- Yom Kippur
- Feast of the Sacrifice (Eid al-Adha)
- Madagascar
- Feast of the Sacrifice (Eid al-Adha)
- Republic of Mali
- Feast of the Sacrifice (Eid al-Adha)
- Mauritania
- Feast of the Sacrifice (Eid al-Adha)
- Malaysia
- Feast of the Sacrifice (Eid al-Adha)
- Republic of the Niger
- Feast of the Sacrifice (Eid al-Adha)
- Nigeria
- Id el Kabir
- Philippines
- Feast of the Sacrifice (Eid al-Adha)
- Rwanda
- Feast of the Sacrifice (Eid al-Adha)
- Sudan
- Feast of the Sacrifice (Eid al-Adha)
- Singapore
- Hari Raya Haji
- Sierra Leone
- Tabaski
- Senegal
- Feast of the Sacrifice (Eid al-Adha)
- Somalia
- Feast of the Sacrifice (Eid al-Adha)
- Suriname
- Feast of the Sacrifice (Eid al-Adha)
- Chad
- Feast of the Sacrifice (Eid al-Adha)
- Tunisia
- Feast of the Sacrifice (Eid al-Adha)
- Turkey
- Feast of the Sacrifice (Eid al-Adha)
- Tanzania
- Feast of the Sacrifice (Eid al-Adha)
- Uganda
- Feast of the Sacrifice (Eid al-Adha)
- Kosovo
- Feast of the Sacrifice (Eid al-Adha)
September 18, 1983
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
- Jordan
- Eid al-Adha Holiday (estimated)
- Kuwait
- Eid al-Adha Holiday (estimated)
- Saudi Arabia
- Eid al-Adha Holiday (estimated)
- Azerbaijan
- Feast of the Sacrifice (Eid al-Adha)
- Malaysia
- Feast of the Sacrifice (Eid al-Adha)
- Togolese Republic
- Feast of the Sacrifice (Eid al-Adha)
September 19, 1983
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Tonga
- Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala
- Jordan
- Eid al-Adha Holiday (estimated)
- Kuwait
- Eid al-Adha Holiday (estimated)
- Saudi Arabia
- Eid al-Adha Holiday (estimated)
- Azerbaijan
- Feast of the Sacrifice (Eid al-Adha) (substitute day)
- Ghana
- Feast of the Sacrifice (Eid al-Adha) (substitute day)
- South Sudan
- Feast of the Sacrifice (Eid al-Adha)
September 20, 1983
- Brazil
- Proclamação da República Rio-Grandense
- Saudi Arabia
- Eid al-Adha Holiday (observed, estimated)
- Azerbaijan
- Feast of the Sacrifice (Eid al-Adha) (substitute day)
September 22, 1983
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Hong Kong
- The day following the Chinese Mid-Autumn Festival
- Republic of Mali
- Independence Day
- Israel
- Feast of Tabernacles (Sukkot)
September 23, 1983
- Japan
- Autumnal Equinox Day
- Papua New Guinea
- September Equinox
September 24, 1983
- Austria
- Rupert
- Bolivia
- Pando Day (N)
- Santa Cruz Day (S)
- Dominican Republic
- Our Lady of las Mercedes
- Spain
- Nuestra Señora de los Reyes (CN)
- Mare de Déu de la Mercè (CT)
- Guinea-Bissau
- Independence Day
- Canary Islands
- Nuestra Señora de los Reyes
- New Caledonia
- New Caledonia Day
- Trinidad & Tobago
- Republic Day
- South Africa
- Heritage Day
September 25, 1983
- Switzerland
- Saint Nicholas of Flüe
- Mozambique
- Defense Force’s Day
- Iran
- Eid al-Ghadeer
September 26, 1983
- Australia
- Queen's Birthday
- Mozambique
- Public Holiday
September 28, 1983
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
September 30, 1983
- Australia
- AFL Grand Final Friday
- Botswana
- Botswana Day
- São Tomé & Príncipe
- Agricultural Reform Day
- Turks & Caicos Islands
- National Youth Day
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