| Date | Country | Holiday name |
|---|---|---|
| 2003-09-01 |  American Samoa | Labour Day |
| 2003-09-01 |  Bermuda | Labour Day |
| 2003-09-01 |  Canada | Labour Day |
| 2003-09-01 |  Eritrea | Revolution Day |
| 2003-09-01 |  Guam | Labour Day |
| 2003-09-01 |  Malaysia | Independence Day (substitute day) |
| 2003-09-01 |  Puerto Rico | Labour Day |
| 2003-09-01 |  Slovakia | Constitution Day |
| 2003-09-01 |  Swaziland | Umhlanga Reed Dance |
| 2003-09-01 |  Trinidad & Tobago | Independence Day (substitute day) |
| 2003-09-01 |  United States of America | Labour Day |
| 2003-09-01 |  U.S. Virgin Islands | Labour Day |
| 2003-09-01 |  Kazakhstan | Constitution Day (observed) |
| 2003-09-01 |  Uzbekistan | Independence Day |
| 2003-09-02 |  Spain | Día de Ceuta |
| 2003-09-02 |  Vietnam | National Day |
| 2003-09-03 |  San Marino | The Feast of San Marino and the Republic |
| 2003-09-05 |  Brazil | Elevação do Amazonas à categoria de província |
| 2003-09-05 |  São Tomé & Príncipe | Armed Forces Day (substitute day) |
| 2003-09-06 |  Bulgaria | Unification Day |
| 2003-09-06 |  Caribbean Netherlands | Bonaire Day |
| 2003-09-06 | São Tomé & Príncipe | Armed Forces Day |
| 2003-09-06 | Swaziland | Independence Day |
| 2003-09-07 | Brazil | Independence Day |
| 2003-09-07 | Spain | La Bajada de la Virgen del Socorro |
| 2003-09-07 |  Fiji | Constitution Day |
| 2003-09-07 | Canary Islands | La Bajada de la Virgen del Socorro |
| 2003-09-07 |  Mozambique | Lusaka Peace Agreement |
| 2003-09-08 |  Andorra | Our Lady of Meritxell |
| 2003-09-08 | Brazil | Nossa Senhora da Luz dos Pinhais (PR) |
| 2003-09-08 | Brazil | Nossa Senhora da Natividade (TO) |
| 2003-09-08 | Spain | Día de Asturias (AS) |
| 2003-09-08 | Spain | Nuestra Señora del Pino (CN) |
| 2003-09-08 | Spain | Día de Extremadura (EX) |
| 2003-09-08 | Canary Islands | Nuestra Señora del Pino |
| 2003-09-08 |  Lichtenstein | Mariä Geburt |
| 2003-09-08 |  Macedonia | Independence Day |
| 2003-09-08 |  Malta | Victory Day |
| 2003-09-08 | Mozambique | Public Holiday |
| 2003-09-08 | Swaziland | Independence Day (substitute day) |
| 2003-09-08 |  Vatican City | Nativity of Mary |
| 2003-09-09 | United States of America | Primary Election Day |
| 2003-09-10 |  Belize | Saint George's Caye Day, National Day |
| 2003-09-10 |  Ecuador | Independence of Guayaquil |
| 2003-09-10 |  Gibraltar | Gibraltar National Day |
| 2003-09-10 |  Iran | Birthday of Imam Ali |
| 2003-09-11 |  Switzerland | Jeûne Genevois |
| 2003-09-11 |  China | Mid-Autumn Festival |
| 2003-09-11 | Eritrea | Geez New Year |
| 2003-09-11 | Spain | Dia de Cataluña |
| 2003-09-11 |  Ethiopia | New Year's Day |
| 2003-09-11 |  South Korea | Korean Thanksgiving |
| 2003-09-11 |  Taiwan | Mid-Autumn Festival |
| 2003-09-12 |  Cape Verde | National Day |
| 2003-09-12 |  Hong Kong | The day following the Chinese Mid-Autumn Festival |
| 2003-09-13 | Brazil | Criação do Território Federal |
| 2003-09-14 |  Bolivia | Cochabamba Day |
| 2003-09-14 |  Nicaragua | Battle of San Jacinto |
| 2003-09-14 |  Venezuela | Día de Barquisimeto |
| 2003-09-15 | Bolivia | Cochabamba Day (substitutes) |
| 2003-09-15 |  Costa Rica | Independence Day |
| 2003-09-15 | Spain | La Bien Aparecida (CB) |
| 2003-09-15 | Spain | Nuestra Señora de los Dolores (CN) |
| 2003-09-15 |  Guatemala | Independence Day |
| 2003-09-15 |  Honduras | Independence Day |
| 2003-09-15 | Canary Islands | Nuestra Señora de los Dolores |
| 2003-09-15 |  Japan | Respect-for-the-Aged Day |
| 2003-09-15 | Nicaragua | Independence Day |
| 2003-09-15 | Slovakia | Day of Our Lady of the Seven Sorrows |
| 2003-09-15 |  El Salvador | Independence Day |
| 2003-09-16 | Brazil | Emancipação política |
| 2003-09-16 |  St. Kitts & Nevis | National Heroes' Day |
| 2003-09-16 |  Libya | Martyrs' Day |
| 2003-09-16 |  Mexico | Independence Day |
| 2003-09-16 | Malaysia | Malaysia Day |
| 2003-09-16 |  Papua New Guinea | Independence Day |
| 2003-09-17 |  Angola | National Hero Day |
| 2003-09-17 |  Tonga | Birthday of His Royal Highness The Crown Prince Tupotoʻa-ʻUlukalala |
| 2003-09-18 |  Chile | National holiday |
| 2003-09-18 | Spain | Nuestra Señora de la Peña |
| 2003-09-18 | Canary Islands | Nuestra Señora de la Peña |
| 2003-09-19 | Chile | Army Day |
| 2003-09-19 | St. Kitts & Nevis | Independence Day |
| 2003-09-20 | Brazil | Proclamação da República Rio-Grandense |
| 2003-09-21 |  Armenia | Independence Day |
| 2003-09-21 | Switzerland | Federal Day of Thanksgiving, Repentance and Prayer |
| 2003-09-21 |  Ghana | Kwame Nkrumah Memorial Day |
| 2003-09-21 | Malta | Independence Day |
| 2003-09-22 | Bulgaria | Independence Day |
| 2003-09-22 | Belize | Independence Day |
| 2003-09-22 | Switzerland | Mauritiustag (AI) |
| 2003-09-22 | Ghana | Kwame Nkrumah Memorial Day (substitute day) |
| 2003-09-22 |  Republic of Mali | Independence Day |
| 2003-09-23 | Japan | Autumnal Equinox Day |
| 2003-09-23 | Papua New Guinea | September Equinox |
| 2003-09-24 |  Austria | Rupert |
| 2003-09-24 | Bolivia | Pando Day (N) |
| 2003-09-24 | Bolivia | Santa Cruz Day (S) |
| 2003-09-24 |  Dominican Republic | Our Lady of las Mercedes |
| 2003-09-24 | Spain | Nuestra Señora de los Reyes (CN) |
| 2003-09-24 | Spain | Mare de Déu de la Mercè (CT) |
| 2003-09-24 |  Guinea-Bissau | Independence Day |
| 2003-09-24 | Canary Islands | Nuestra Señora de los Reyes |
| 2003-09-24 |  New Caledonia | New Caledonia Day |
| 2003-09-24 | Trinidad & Tobago | Republic Day |
| 2003-09-24 |  South Africa | Heritage Day |
| 2003-09-24 |  Cambodia | Constitution Day; Pchum Ben Day |
| 2003-09-24 |  Jordan | Isra' and Mi'raj (estimated) |
| 2003-09-24 |  Kuwait | Isra' and Mi'raj (estimated) |
| 2003-09-24 |  United Arab Emirates | Laylat al-Mi'raj |
| 2003-09-24 |  Brunei | Laylat al-Mi'raj |
| 2003-09-24 |  Djibouti | Laylat al-Mi'raj |
| 2003-09-24 |  Indonesia | Laylat al-Mi'raj |
| 2003-09-24 | Iran | Mabaas of Muhammad |
| 2003-09-24 |  Comoros | Laylat al-Mi'raj |
| 2003-09-24 | Malaysia | Laylat al-Mi'raj |
| 2003-09-24 |  Somalia | Laylat al-Mi'raj |
| 2003-09-25 | Switzerland | Saint Nicholas of Flüe |
| 2003-09-25 | Mozambique | Defense Force’s Day |
| 2003-09-25 | Cambodia | Pchum Ben Day |
| 2003-09-26 |  Australia | AFL Grand Final Friday |
| 2003-09-26 |  Turks & Caicos Islands | National Youth Day |
| 2003-09-27 | Eritrea | Meskel |
| 2003-09-27 | Ethiopia | Finding of the True Cross |
| 2003-09-27 |  Israel | Rosh Hashanah (Yom Teruah) |
| 2003-09-28 |  Czech Republic | St. Wenceslas Day (Czech Statehood Day) |
| 2003-09-28 | Israel | Rosh Hashanah (Day 2) |
| 2003-09-29 | Australia | Queen's Birthday |
| 2003-09-29 |  Paraguay | Boqueron Battle Victory Day |
| 2003-09-30 |  Botswana | Botswana Day |
| 2003-09-30 | São Tomé & Príncipe | Agricultural Reform Day |
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