September 2, 1991
- American Samoa
- Labour Day
- Bermuda
- Labour Day
- Canada
- Labour Day
- Spain
- Día de Ceuta
- Guam
- Labour Day
- Puerto Rico
- Labour Day
- Swaziland
- Umhlanga Reed Dance
- United States of America
- Labour Day
- U.S. Virgin Islands
- Labour Day
- Vietnam
- National Day
September 3, 1991
- San Marino
- The Feast of San Marino and the Republic
September 5, 1991
- Brazil
- Elevação do Amazonas à categoria de província
- Switzerland
- Jeûne Genevois
September 6, 1991
- Bulgaria
- Unification Day
- Caribbean Netherlands
- Bonaire Day
- São Tomé & Príncipe
- Armed Forces Day
- Swaziland
- Independence Day
September 7, 1991
- 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
- Iran
- Demise of Prophet Muhammad and Imam Hassan (Mujtaba)
September 8, 1991
- Andorra
- Our Lady of Meritxell
- Brazil
- Nossa Senhora da Luz dos Pinhais
- 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, 1991
- Belize
- Saint George's Caye Day, National Day
- Ecuador
- Independence of Guayaquil
- Gibraltar
- Gibraltar National Day
- United States of America
- Primary Election Day
- Israel
- Rosh Hashanah (Day 2)
September 12, 1991
- Cape Verde
- National Day
September 13, 1991
- Brazil
- Criação do Território Federal
September 15, 1991
- Switzerland
- Federal Day of Thanksgiving, Repentance and Prayer
- 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, 1991
- Brazil
- Emancipação política
- Spain
- La Bien Aparecida
- Japan
- Respect-for-the-Aged Day (substitute day)
- St. Kitts & Nevis
- National Heroes' Day
- Libya
- Martyrs' Day
- Mexico
- Independence Day
- Malaysia
- Malaysia Day
- Tonga
- Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala
- Papua New Guinea
- Independence Day
- Iran
- Martyrdom of Imam Hassan
September 18, 1991
- Chile
- National holiday
- Spain
- Nuestra Señora de la Peña
- Canary Islands
- Nuestra Señora de la Peña
- Israel
- Day of Atonement (Yom Kippur)
- Montenegro
- Yom Kippur
September 19, 1991
- Chile
- Army Day
- St. Kitts & Nevis
- Independence Day
September 20, 1991
- Brazil
- Proclamação da República Rio-Grandense
- Chile
- National Holiday
- Jordan
- Prophet's Birthday (estimated)
- Kuwait
- Prophet's Birthday (estimated)
- 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)
- Eritrea
- Birthday of Muhammad (Mawlid)
- Ethiopia
- 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 21, 1991
- Armenia
- Independence Day
- Belize
- Independence Day
- Ghana
- Kwame Nkrumah Memorial Day
- Malta
- Independence Day
- Togolese Republic
- Birthday of Muhammad (Mawlid)
September 22, 1991
- Bulgaria
- Independence Day
- Switzerland
- Mauritiustag
- China
- Mid-Autumn Festival
- South Korea
- Korean Thanksgiving
- Republic of Mali
- Independence Day
- Taiwan
- Mid-Autumn Festival
September 24, 1991
- 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, 1991
- Switzerland
- Saint Nicholas of Flüe
- Mozambique
- Defense Force’s Day
- Iran
- Birthday of Muhammad Prophet
September 27, 1991
- Australia
- AFL Grand Final Friday
- Eritrea
- Meskel
- Ethiopia
- Finding of the True Cross
- Turks & Caicos Islands
- National Youth Day
September 28, 1991
- Czech Republic
- St. Wenceslas Day (Czech Statehood Day)
September 29, 1991
- Paraguay
- Boqueron Battle Victory Day
September 30, 1991
- Australia
- Queen's Birthday
- Botswana
- Botswana Day
- São Tomé & Príncipe
- Agricultural Reform Day
- Israel
- Simchat Torah/ Shmini Atzeret
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