September 1, 2023
- Eritrea
- Revolution Day
- Singapore
- Presidential Election Day
- Slovakia
- Constitution Day
- Uzbekistan
- Independence Day
- Turkmenistan
- Day of Students and Knowledge
- Nepal
- Gai Jatra
- Marshall Islands
- Labor Day
September 3, 2023
- San Marino
- The Feast of San Marino and the Republic
- New Zealand
- Fathers' Day
- Australia
- Fathers' Day
- Senegal
- Magal de Touba
September 4, 2023
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Canada
- Labour Day
- Gibraltar
- Gibraltar National Day (substitute day)
- Guam
- Labour Day
- Puerto Rico
- Labour Day
- Swaziland
- Umhlanga Reed Dance
- United States of America
- Labour Day
- U.S. Virgin Islands
- Labour Day
- United States Minor Outlying Islands
- Labor Day
- Palau
- Labor Day
- Northern Mariana Islands
- Labor Day
- South Georgia and the South Sandwich Islands
- Toothfish Day
September 6, 2023
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
- Pakistan
- Chelum
- Defence Day
- Nepal
- Gaura Parba
- Shree Krishna Janamashtami (Tentative Date)
- Myanmar
- Janmashtami
- United Kingdom
- Janmashtami (Smarta)
- India
- Janmashtami (Smarta)
September 7, 2023
- Brazil
- Independence Day
- Switzerland
- Jeûne Genevois
- Spain
- La Bajada de la Virgen del Socorro
- Fiji
- Constitution Day
- Canary Islands
- La Bajada de la Virgen del Socorro
- Mozambique
- Lusaka Peace Agreement
- Pakistan
- Janmashtami
- United Kingdom
- Janmashtami
- India
- Janmashtami
September 8, 2023
- Andorra
- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais (PR)
- Nossa Senhora da Natividade (TO)
- 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
- Lebanon
- Nativity of Mary
- Micronesia
- Kosrae Liberation Day
September 9, 2023
- Turkmenistan
- Day of the Workers in the Energy Sector
- Tajikistan
- Independence Day
- North Korea
- National Day
- Afghanistan
- Martyrs and Ahmad Shah Masoud Day
September 11, 2023
- Belize
- Saint George's Caye Day, National Day
- Eritrea
- Geez New Year
- Spain
- Dia de Cataluña
- Ethiopia
- New Year's Day
- Tajikistan
- Day off for Independence Day
- Maldives
- Public Holiday
- Micronesia
- Pohnpei Liberation Day
September 12, 2023
- Cape Verde
- National Day
- United States of America
- Primary Election Day
September 15, 2023
- 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
- Nicaragua
- Independence Day
- Slovakia
- Day of Our Lady of the Seven Sorrows
- El Salvador
- Independence Day
- Papua New Guinea
- Day off for Independence Day
- Iran
- Martyrdom of Imam Reza
September 16, 2023
- Brazil
- Emancipação política
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Papua New Guinea
- Independence Day
- Maldives
- National Day
- United Kingdom
- Rosh Hashana
- Australia
- Rosh Hashana
- Israel
- Rosh Hashanah (Yom Teruah)
September 17, 2023
- Angola
- National Hero Day
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- Israel
- Rosh Hashanah (Day 2)
September 18, 2023
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
- Japan
- Respect-for-the-Aged Day
- Tonga
- Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala
- Nepal
- Hartalika Teej
- United Kingdom
- Ganesh Chaturthi
September 22, 2023
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- Republic of Mali
- Independence Day
- French Polynesia
- September Equinox
September 23, 2023
- Japan
- Autumnal Equinox Day
- Saudi Arabia
- National Day Holiday
- Yemen
- September Equinox
- Samoa
- September Equinox
- Wallis and Futuna
- September Equinox
- United States Minor Outlying Islands
- September Equinox
- Tuvalu
- September Equinox
- Turkmenistan
- September Equinox
- Tajikistan
- September Equinox
- French Southern Territories
- September Equinox
- Syria
- September Equinox
- Solomon Islands
- September Equinox
- Qatar
- September Equinox
- Palau
- September Equinox
- Palestinian Territory
- September Equinox
- Pitcairn
- September Equinox
- Oman
- September Equinox
- Niue
- September Equinox
- Nauru
- September Equinox
- Nepal
- September Equinox
- Norfolk Island
- September Equinox
- Maldives
- September Equinox
- Mauritius
- September Equinox
- Northern Mariana Islands
- September Equinox
- Macao
- September Equinox
- Mongolia
- September Equinox
- Myanmar
- September Equinox
- Marshall Islands
- September Equinox
- Sri Lanka
- September Equinox
- Lebanon
- September Equinox
- North Korea
- September Equinox
- Kiribati
- September Equinox
- Kyrgyzstan
- September Equinox
- Iraq
- September Equinox
- India
- September Equinox
- South Georgia and the South Sandwich Islands
- September Equinox
- Micronesia
- September Equinox
- Falkland Islands
- September Equinox
- Bhutan
- September Equinox
- Antarctica
- September Equinox
- Afghanistan
- September Equinox
- Iran
- Martyrdom of Imam Hassan
- Pakistan
- September Equinox
- New Zealand
- September Equinox
- Papua New Guinea
- September Equinox
- United Kingdom
- September Equinox
- Australia
- September Equinox
- Norway
- September Equinox
- Netherlands
- September Equinox
September 24, 2023
- Austria
- Rupert
- Bolivia
- Pando Day (N)
- Santa Cruz Day (S)
- Dominican Republic
- Our Lady of las Mercedes
- Spain
- Nuestra Señora de los Reyes
- Guinea-Bissau
- Independence Day
- Canary Islands
- Nuestra Señora de los Reyes
- New Caledonia
- New Caledonia Day
- Trinidad & Tobago
- Republic Day
- South Africa
- Heritage Day
- Cambodia
- Constitution Day
- Saudi Arabia
- National Day Holiday (observed)
- Bhutan
- Blessed Rainy Day
- Thimphu Tshechu (Thimphu only)
September 25, 2023
- Australia
- King's Birthday
- Yom Kippur
- Bolivia
- Pando Day (substitutes) (N)
- Santa Cruz Day (substitutes) (S)
- Switzerland
- Saint Nicholas of Flüe
- Spain
- Mare de Déu de la Mercè
- Mozambique
- Defense Force’s Day
- Trinidad & Tobago
- Republic Day (substitute day)
- South Africa
- Public Holiday
- Nauru
- Sir Hammer DeRoburt Day
- United Kingdom
- Yom Kippur
- Bhutan
- Thimphu Tshechu (Thimphu only)
- Israel
- Day of Atonement (Yom Kippur)
- Montenegro
- Yom Kippur
September 26, 2023
- Pakistan
- Giarhwin Sharief
- Yemen
- Revolution Day
- Palestinian Territory
- Birth of the Prophet
- Bhutan
- Thimphu Tshechu (Thimphu only)
September 27, 2023
- Eritrea
- Meskel
- Birthday of Muhammad (Mawlid)
- Ethiopia
- Finding of the True Cross
- Birthday of Muhammad (Mawlid)
- Jordan
- Prophet's Birthday (estimated)
- Kuwait
- Prophet's Birthday (estimated)
- Yemen
- The Prophet's Birthday
- Turkmenistan
- Independence Day
- Syria
- The Prophet's Birthday (Tentative Date)
- Maldives
- Milad un Nabi (Mawlid)
- Lebanon
- The Prophet's Birthday
- Iraq
- The Prophet's Birthday
- Australia
- Milad un Nabi (Mawlid)
- Afghanistan
- The Prophet's Birthday
- United Arab Emirates
- Birthday of Muhammad (Mawlid)
- Bosnia and Herzegovina
- Birthday of Muhammad (Mawlid)
- People's Republic of Bangladesh
- Birthday of Muhammad (Mawlid)
- Burkina Faso
- Birthday of Muhammad (Mawlid)
- Bahrain
- Birthday of Muhammad (Mawlid)
- Benin
- Birthday of Muhammad (Mawlid)
- Brunei
- Birthday of Muhammad (Mawlid)
- Cocos (Keeling) Islands
- Hari Maulaud Nabi
- Republic of Côte d'Ivoire
- Birthday of Muhammad (Mawlid)
- Djibouti
- Birthday of Muhammad (Mawlid)
- Algeria
- Birthday of Muhammad (Mawlid)
- Egypt
- Birthday of Muhammad (Mawlid)
- Western Sahara
- Birthday of Muhammad (Mawlid)
- Fiji
- Birthday of Muhammad (Mawlid)
- The Gambia
- Birthday of Muhammad (Mawlid)
- Guinea
- Birthday of Muhammad (Mawlid)
- Guyana
- Youman Nabi
- Indonesia
- Birthday of Muhammad (Mawlid)
- Comoros
- Birthday of Muhammad (Mawlid)
- Libya
- Birthday of Muhammad (Mawlid)
- Kingdom of Morocco
- Birthday of Muhammad (Mawlid)
- Republic of Mali
- Birthday of Muhammad (Mawlid)
- Mauritania
- Birthday of Muhammad (Mawlid)
- Malaysia
- Birthday of Muhammad (Mawlid)
- Republic of the Niger
- Birthday of Muhammad (Mawlid)
- Nigeria
- Birthday of Muhammad (Mawlid)
- Sudan
- Birthday of Muhammad (Mawlid)
- Sierra Leone
- Mawlid
- Senegal
- Birthday of Muhammad (Mawlid)
- Somalia
- Birthday of Muhammad (Mawlid)
- Chad
- Birthday of Muhammad (Mawlid)
- Tunisia
- Birthday of Muhammad (Mawlid)
- Tanzania
- Maulid Day
September 28, 2023
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
- Oman
- The Prophet's Birthday
- Nepal
- Indra Jatra
- Maldives
- Public Holiday
- Sri Lanka
- Milad-Un-Nabi (Holy Prophet's Birthday)
- United Kingdom
- Milad un Nabi (Mawlid)
- India
- Milad un-Nabi/Id-e-Milad
- Togolese Republic
- Birthday of Muhammad (Mawlid)
September 29, 2023
- Australia
- AFL Grand Final Friday
- China
- Mid-Autumn Festival
- South Korea
- Korean Thanksgiving
- Paraguay
- Boqueron Battle Victory Day
- São Tomé & Príncipe
- Agricultural Reform Day (substitute day)
- Turks & Caicos Islands
- National Youth Day
- Taiwan
- Mid-Autumn Festival
- Pakistan
- Eid Milad un-Nabi
- Marshall Islands
- Manit Day
- Sri Lanka
- Binara Full Moon Poya Day
- North Korea
- Chuseok Harvest Festival
September 30, 2023
- Botswana
- Botswana Day
- Canada
- National Day for Truth and Reconciliation
- Hong Kong
- The day following the Chinese Mid-Autumn Festival
- São Tomé & Príncipe
- Agricultural Reform Day
- Macao
- Day after the Mid-Autumn-Festival
- United Kingdom
- First day of Sukkot
- Australia
- First day of Sukkot
- Daylight Saving Time starts
- Israel
- Feast of Tabernacles (Sukkot)
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