September 3, 1977
- San Marino
- The Feast of San Marino and the Republic
September 4, 1977
- Iran
- Martyrdom of Imam Ali
September 5, 1977
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- 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, 1977
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
- The Gambia
- Lailat al-Qadr
September 7, 1977
- 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, 1977
- 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
September 10, 1977
- Belize
- Saint George's Caye Day, National Day
- Ecuador
- Independence of Guayaquil
- Gibraltar
- Gibraltar National Day
- Republic of Côte d'Ivoire
- Laylat al-Qadr
- Guinea
- Laylat al-Qadr
- Republic of the Niger
- Laylat al-Qadr
September 12, 1977
- Cape Verde
- National Day
September 13, 1977
- Brazil
- Criação do Território Federal
- United States of America
- Primary Election Day
- Israel
- Rosh Hashanah (Yom Teruah)
September 14, 1977
- Bolivia
- Cochabamba Day
- Nicaragua
- Battle of San Jacinto
- Venezuela
- Día de Barquisimeto
- Jordan
- Eid al-Fitr (estimated)
- Kuwait
- Eid al-Fitr (estimated)
- Saudi Arabia
- Eid al-Fitr Holiday (estimated)
- United Arab Emirates
- End of Ramadan (Eid al-Fitr)
- Albania
- End of Ramadan (Eid al-Fitr)
- Azerbaijan
- End of Ramadan (Eid al-Fitr)
- Bosnia and Herzegovina
- End of Ramadan (Eid al-Fitr)
- People's Republic of Bangladesh
- End of Ramadan (Eid al-Fitr)
- Burkina Faso
- End of Ramadan (Eid al-Fitr)
- Bahrain
- End of Ramadan (Eid al-Fitr)
- Burundi
- End of Ramadan (Eid al-Fitr)
- Benin
- End of Ramadan (Eid al-Fitr)
- Brunei
- End of Ramadan (Eid al-Fitr)
- Cocos (Keeling) Islands
- Hari Raya Puasa
- Central African Republic
- End of Ramadan (Eid al-Fitr)
- Republic of Côte d'Ivoire
- End of Ramadan (Eid al-Fitr)
- Cameroon
- End of Ramadan (Eid al-Fitr)
- Christmas Island
- End of Ramadan (Eid al-Fitr)
- Djibouti
- End of Ramadan (Eid al-Fitr)
- Algeria
- End of Ramadan (Eid al-Fitr)
- Egypt
- End of Ramadan (Eid al-Fitr)
- Western Sahara
- End of Ramadan (Eid al-Fitr)
- Eritrea
- End of Ramadan (Eid al-Fitr)
- Spain
- End of Ramadan (Eid al-Fitr)
- Ethiopia
- End of Ramadan (Eid al-Fitr)
- Gabon
- End of Ramadan (Eid al-Fitr)
- Ghana
- End of Ramadan (Eid al-Fitr)
- The Gambia
- Korité
- Guinea
- End of Ramadan (Eid al-Fitr)
- Guinea-Bissau
- End of Ramadan (Eid al-Fitr)
- Indonesia
- End of Ramadan (Eid al-Fitr)
- Israel
- Rosh Hashanah (Day 2)
- Iran
- End of Ramadan (Eid al-Fitr)
- Kenya
- End of Ramadan (Eid al-Fitr)
- Comoros
- End of Ramadan (Eid al-Fitr)
- Libya
- End of Ramadan (Eid al-Fitr)
- Kingdom of Morocco
- End of Ramadan (Eid al-Fitr)
- Montenegro
- End of Ramadan (Eid al-Fitr)
- Madagascar
- End of Ramadan (Eid al-Fitr)
- Macedonia
- End of Ramadan (Eid al-Fitr)
- Republic of Mali
- End of Ramadan (Eid al-Fitr)
- Mauritania
- End of Ramadan (Eid al-Fitr)
- Malawi
- Eid al Fitri
- Malaysia
- End of Ramadan (Eid al-Fitr)
- Republic of the Niger
- End of Ramadan (Eid al-Fitr)
- Nigeria
- Id el Fitr
- Philippines
- End of Ramadan (Eid al-Fitr)
- Rwanda
- End of Ramadan (Eid al-Fitr)
- Sudan
- End of Ramadan (Eid al-Fitr)
- Singapore
- Hari Raya Puasa
- Sierra Leone
- Korité
- Senegal
- End of Ramadan (Eid al-Fitr)
- Somalia
- End of Ramadan (Eid al-Fitr)
- Suriname
- End of Ramadan (Eid al-Fitr)
- Chad
- End of Ramadan (Eid al-Fitr)
- Tunisia
- End of Ramadan (Eid al-Fitr)
- Turkey
- End of Ramadan (Eid al-Fitr)
- Trinidad & Tobago
- End of Ramadan (Eid al-Fitr)
- Tanzania
- End of Ramadan (Eid al-Fitr)
- Uganda
- End of Ramadan (Eid al-Fitr)
- Kosovo
- End of Ramadan (Eid al-Fitr)
September 15, 1977
- 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
- Jordan
- Eid al-Fitr Holiday (estimated)
- Kuwait
- Eid al-Fitr Holiday (estimated)
- Saudi Arabia
- Eid al-Fitr Holiday (estimated)
- Azerbaijan
- End of Ramadan (Eid al-Fitr)
- Indonesia
- End of Ramadan (Eid al-Fitr)
- Iran
- Holyday for Fetr Eeid
- Malaysia
- End of Ramadan (Eid al-Fitr)
- South Sudan
- End of Ramadan (Eid al-Fitr)
- Togolese Republic
- End of Ramadan (Eid al-Fitr)
September 16, 1977
- Brazil
- Emancipação política
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Jordan
- Eid al-Fitr Holiday (estimated)
- Kuwait
- Eid al-Fitr Holiday (estimated)
- Saudi Arabia
- Eid al-Fitr Holiday (estimated)
- Papua New Guinea
- Independence Day
September 17, 1977
- Angola
- National Hero Day
- Saudi Arabia
- Eid al-Fitr Holiday (estimated)
September 18, 1977
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
- Saudi Arabia
- Eid al-Fitr Holiday (observed, estimated)
September 19, 1977
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
- Tonga
- Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala
- Saudi Arabia
- Eid al-Fitr Holiday (observed, estimated)
September 20, 1977
- Brazil
- Proclamação da República Rio-Grandense
September 22, 1977
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Republic of Mali
- Independence Day
- Israel
- Day of Atonement (Yom Kippur)
- Montenegro
- Yom Kippur
September 23, 1977
- Japan
- Autumnal Equinox Day
- Papua New Guinea
- September Equinox
September 24, 1977
- 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, 1977
- Switzerland
- Saint Nicholas of Flüe
- Mozambique
- Defense Force’s Day
September 26, 1977
- Australia
- Queen's Birthday
- Mozambique
- Public Holiday
September 28, 1977
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
- Hong Kong
- The day following the Chinese Mid-Autumn Festival
September 29, 1977
- Paraguay
- Boqueron Battle Victory Day
September 30, 1977
- Australia
- AFL Grand Final Friday
- Botswana
- Botswana Day
- São Tomé & Príncipe
- Agricultural Reform Day
- Turks & Caicos Islands
- National Youth Day
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