April 1, 1957
- Argentina
- Bridge Day
- Cyprus
- Cyprus National Day
- Iran
- Islamic Republic Day
- San Marino
- Inauguration Ceremony
- United States of America
- César Chávez Day (substitute day)
April 3, 1957
- Guinea
- National Holiday
April 4, 1957
- Angola
- Peace Day
- Switzerland
- Näfelser Fahrt
- Senegal
- National Holiday
- Taiwan
- Children's Day
April 6, 1957
- Burundi
- Ntaryamira Day
- Cocos (Keeling) Islands
- Self Determination Day
- Thailand
- Chakri Memorial Day
April 7, 1957
- Mozambique
- Women’s Day
- Rwanda
- Genocide Memorial Day
- Tanzania
- Karume Day
April 8, 1957
- Mozambique
- Public Holiday
April 9, 1957
- Georgia
- National Unity Day
- Philippines
- Day of Valor
- Tunisia
- عيد الشهداء
- Vietnam
- Hung Kings Commemorations
- Kosovo
- Constitution Day
April 11, 1957
- Costa Rica
- Gesta Heroica de Juan Santamaría
April 12, 1957
- Liberia
- Fast and Prayer Day
April 13, 1957
- Thailand
- Songkran Festival
April 14, 1957
- People's Republic of Bangladesh
- Bengali New Year's Day
- Honduras
- Día de las Américas
- Thailand
- Songkran Festival
April 15, 1957
- Bolivia
- Tarija Day
- Malaysia
- Declaration of Malacca City as Historical City
- St. Helena
- Queen's Birthday
- Thailand
- Songkran Festival
- United States of America
- Patriots' Day (MA)
April 16, 1957
- Puerto Rico
- Birthday of José de Diego
- United States of America
- Emancipation Day
April 17, 1957
- American Samoa
- American Samoa Flag Day
- Gabon
- Women's Day
April 18, 1957
- Argentina
- Maundy Thursday
- Colombia
- Maundy Thursday
- Costa Rica
- Maundy Thursday
- Denmark
- Maundy Thursday
- Ecuador
- Maundy Thursday
- Spain
- Maundy Thursday
- Faroe Islands
- Maundy Thursday
- Greenland
- Maundy Thursday
- Guatemala
- Maundy Thursday
- Honduras
- Maundy Thursday
- Canary Islands
- Maundy Thursday
- Iceland
- Maundy Thursday
- First Day of Summer
- Nicaragua
- Maundy Thursday
- Norway
- Maundy Thursday
- Peru
- Maundy Thursday
- Philippines
- Maundy Thursday
- Paraguay
- Maundy Thursday
- Svalbard & Jan Mayen
- Maundy Thursday
- El Salvador
- Maundy Thursday
- Uruguay
- Maundy Thursday
- Venezuela
- Maundy Thursday
- U.S. Virgin Islands
- Maundy Thursday
- Zimbabwe
- Independence Day
April 19, 1957
- Andorra
- Good Friday
- Antigua & Barbuda
- Good Friday
- Anguilla
- Good Friday
- Angola
- Good Friday
- Argentina
- Good Friday
- Australia
- Good Friday
- Aruba
- Good Friday
- Åland Islands
- Good Friday
- Barbados
- Good Friday
- Bulgaria
- Good Friday
- Bermuda
- Good Friday
- Bolivia
- Good Friday
- Caribbean Netherlands
- Good Friday
- Brazil
- Good Friday
- Bahamas
- Good Friday
- Botswana
- Good Friday
- Belize
- Good Friday
- Canada
- Good Friday
- Switzerland
- Good Friday
- Cook Islands
- Good Friday
- Chile
- Good Friday
- Cameroon
- Good Friday
- Colombia
- Good Friday
- Costa Rica
- Good Friday
- Cuba
- Good Friday
- Cape Verde
- Good Friday
- Curaçao
- Good Friday
- Christmas Island
- Good Friday
- Cyprus
- Good Friday
- Czech Republic
- Good Friday
- Germany
- Good Friday
- Denmark
- Good Friday
- Dominica
- Good Friday
- Dominican Republic
- Good Friday
- Ecuador
- Good Friday
- Estonia
- Good Friday
- Eritrea
- Orthodox Good Friday
- Spain
- Good Friday
- Ethiopia
- Good Friday
- Finland
- Good Friday
- Fiji
- Good Friday
- Faroe Islands
- Good Friday
- United Kingdom
- Good Friday
- Grenada
- Good Friday
- Georgia
- Good Friday
- Guernsey
- Good Friday
- Ghana
- Good Friday
- Gibraltar
- Good Friday
- Greenland
- Good Friday
- The Gambia
- Good Friday
- Guadeloupe
- Good Friday
- Republic of Equatorial Guinea
- Good Friday
- Greece
- Good Friday
- Guatemala
- Good Friday
- Guyana
- Good Friday
- Hong Kong
- Good Friday
- Honduras
- Good Friday
- Haiti
- Good Friday
- Canary Islands
- Good Friday
- Indonesia
- Good Friday
- Isle of Man
- Good Friday
- Iceland
- Good Friday
- Jersey
- Good Friday
- Jamaica
- Good Friday
- Kenya
- Good Friday
- St. Kitts & Nevis
- Good Friday
- Cayman Islands
- Good Friday
- St. Lucia
- Good Friday
- Lichtenstein
- Good Friday
- Lesotho
- Good Friday
- Latvia
- Good Friday
- Montenegro
- Good Friday
- Martinique
- Good Friday
- Montserrat
- Good Friday
- Malta
- Good Friday
- Malawi
- Good Friday
- Malaysia
- Good Friday
- Namibia
- Good Friday
- Nigeria
- Good Friday
- Nicaragua
- Good Friday
- Norway
- Good Friday
- New Zealand
- Good Friday
- Panama
- Good Friday
- Peru
- Good Friday
- Philippines
- Good Friday
- Portugal
- Good Friday
- Paraguay
- Good Friday
- Romania
- Good Friday
- Serbia
- Orthodox Good Friday
- Rwanda
- Good Friday
- Seychelles
- Good Friday
- Sweden
- Good Friday
- Singapore
- Good Friday
- St. Helena
- Good Friday
- Svalbard & Jan Mayen
- Good Friday
- Slovakia
- Good Friday
- Sierra Leone
- Good Friday
- Suriname
- Good Friday
- El Salvador
- Good Friday
- Sint Maarten
- Good Friday
- Swaziland
- Good Friday
- Birthday of King Mswati III
- Turks & Caicos Islands
- Good Friday
- Tonga
- Good Friday
- Trinidad & Tobago
- Good Friday
- Tanzania
- Good Friday
- Uganda
- Good Friday
- Uruguay
- Good Friday
- St. Vincent & Grenadines
- Good Friday
- Venezuela
- Declaration of Independence
- Good Friday
- British Virgin Islands
- Good Friday
- U.S. Virgin Islands
- Good Friday
- Vanuatu
- Good Friday
- South Africa
- Good Friday
- Zambia
- Good Friday
- Zimbabwe
- Good Friday
- United States of America
- Good Friday (KY)
April 20, 1957
- Australia
- Easter Saturday
- Botswana
- Easter Saturday
- Belize
- Easter Saturday
- Fiji
- Easter Saturday
- Georgia
- Easter Saturday
- Guatemala
- Easter Saturday
- Hong Kong
- Easter Saturday
- Seychelles
- Easter Saturday
- El Salvador
- Easter Saturday
April 21, 1957
- Andorra
- Easter Sunday
- Albania
- Catholic Easter
- Orthodox Easter
- Austria
- Easter Sunday
- Australia
- Easter Sunday
- Bosnia and Herzegovina
- Easter Sunday
- Orthodox Easter
- Burkina Faso
- Easter Sunday
- Bulgaria
- Easter Sunday
- Brazil
- Tiradentes' Day
- Fundação de Brasília (DF)
- Data magna do estado (MG)
- Canada
- Easter Sunday
- Switzerland
- Easter Sunday
- Chile
- Easter Sunday
- Colombia
- Easter Sunday
- Cyprus
- Easter Sunday
- Denmark
- Easter Sunday
- Estonia
- Easter Sunday
- Eritrea
- Orthodox Easter
- Ethiopia
- Easter Sunday
- Finland
- Easter Sunday
- Faroe Islands
- Easter Sunday
- Georgia
- Easter Sunday
- Greenland
- Easter Sunday
- Greece
- Easter Sunday
- Hong Kong
- Easter Sunday
- Croatia
- Easter Sunday
- Haiti
- Easter Sunday
- Hungary
- Easter Sunday
- Ireland
- Easter Sunday
- Iceland
- Easter Sunday
- Italia
- Easter Sunday
- Kenya
- Easter Sunday
- Lithuania
- Easter Sunday
- Latvia
- Easter Sunday
- Moldova
- Easter Sunday
- Montenegro
- Easter Sunday
- Madagascar
- Easter Sunday
- Macedonia
- Orthodox Easter
- Netherlands
- Easter Sunday
- Norway
- Easter Sunday
- Peru
- Easter Sunday
- Philippines
- Easter Sunday
- Poland
- Easter Sunday
- Portugal
- Easter Sunday
- Romania
- Easter Sunday
- Serbia
- Orthodox Easter
- Seychelles
- Easter Sunday
- Sudan
- Coptic Easter
- Slovenia
- Easter Sunday
- Svalbard & Jan Mayen
- Easter Sunday
- San Marino
- Easter Sunday
- Sint Maarten
- Easter Sunday
- Trinidad & Tobago
- Easter Sunday
- Ukraine
- Orthodox Easter
- Uganda
- Easter Sunday
- Venezuela
- Easter Sunday
- Kosovo
- Easter Sunday
- Orthodox Easter
April 22, 1957
- Andorra
- Easter Monday
- Antigua & Barbuda
- Easter Monday
- Anguilla
- Easter Monday
- Albania
- Catholic Easter
- Orthodox Easter
- Austria
- Easter Monday
- Australia
- Easter Monday
- Aruba
- Easter Monday
- Åland Islands
- Easter Monday
- Bosnia and Herzegovina
- Easter Monday
- Barbados
- Easter Monday
- Belgium
- Easter Monday
- Burkina Faso
- Easter Monday
- Bulgaria
- Easter Monday
- Benin
- Easter Monday
- St. Barths
- Easter Monday
- Caribbean Netherlands
- Easter Monday
- Bahamas
- Easter Monday
- Botswana
- Easter Monday
- Belize
- Easter Monday
- Canada
- Easter Monday
- Cocos (Keeling) Islands
- Easter Monday
- Central African Republic
- Easter Monday
- Republic of the Congo
- Easter Monday
- Switzerland
- Easter Monday
- Republic of Côte d'Ivoire
- Easter Monday
- Cook Islands
- Easter Monday
- Curaçao
- Easter Monday
- Cyprus
- Easter Monday
- Czech Republic
- Easter Monday
- Germany
- Easter Monday
- Denmark
- Easter Monday
- Dominica
- Easter Monday
- Egypt
- Sham El Nessim
- Spain
- Easter Monday
- Finland
- Easter Monday
- Fiji
- Easter Monday
- Faroe Islands
- Easter Monday
- France
- Easter Monday
- Gabon
- Easter Monday
- United Kingdom
- Easter Monday
- Grenada
- Easter Monday
- Georgia
- Easter Monday
- French Guiana
- Easter Monday
- Guernsey
- Easter Monday
- Ghana
- Easter Monday
- Gibraltar
- Easter Monday
- Greenland
- Easter Monday
- The Gambia
- Easter Monday
- Guinea
- Easter Monday
- Guadeloupe
- Easter Monday
- Greece
- Easter Monday
- Guyana
- Easter Monday
- Hong Kong
- Easter Monday
- Croatia
- Easter Monday
- Hungary
- Easter Monday
- Ireland
- Easter Monday
- Isle of Man
- Easter Monday
- Iceland
- Easter Monday
- Italia
- Easter Monday
- Jersey
- Easter Monday
- Jamaica
- Easter Monday
- Kenya
- Easter Monday
- St. Kitts & Nevis
- Easter Monday
- Cayman Islands
- Easter Monday
- St. Lucia
- Easter Monday
- Lichtenstein
- Easter Monday
- Lesotho
- Easter Monday
- Lithuania
- Easter Monday
- Luxembourg
- Easter Monday
- Latvia
- Easter Monday
- Monaco
- Easter Monday
- Moldova
- Easter Monday
- Montenegro
- Easter Sunday
- St. Martin
- Easter Monday
- Madagascar
- Easter Monday
- Macedonia
- Orthodox Easter Monday
- Republic of Mali
- Easter Monday
- Martinique
- Easter Monday
- Montserrat
- Easter Monday
- Malawi
- Easter Monday
- Namibia
- Easter Monday
- New Caledonia
- Easter Monday
- Republic of the Niger
- Easter Monday
- Nigeria
- Easter Monday
- Netherlands
- Easter Monday
- Norway
- Easter Monday
- New Zealand
- Easter Monday
- Poland
- Easter Monday
- St. Pierre & Miquelon
- Easter Monday
- Réunion
- Easter Monday
- Romania
- Easter Monday
- Serbia
- Orthodox Easter Monday
- Rwanda
- Easter Monday
- Seychelles
- Easter Monday
- Sweden
- Easter Monday
- St. Helena
- Easter Monday
- Slovenia
- Easter Monday
- Svalbard & Jan Mayen
- Easter Monday
- Slovakia
- Easter Monday
- Sierra Leone
- Easter Monday
- San Marino
- Easter Monday
- Senegal
- Easter Monday
- Suriname
- Easter Monday
- Sint Maarten
- Easter Monday
- Swaziland
- Easter Monday
- Turks & Caicos Islands
- Easter Monday
- Chad
- Easter Monday
- Togolese Republic
- Easter Monday
- Tonga
- Easter Monday
- Tanzania
- Easter Monday
- Ukraine
- Orthodox Easter
- Uganda
- Easter Monday
- United States of America
- Confederate Memorial Day
- Vatican City
- Easter Monday
- St. Vincent & Grenadines
- Easter Monday
- British Virgin Islands
- Easter Monday
- U.S. Virgin Islands
- Easter Monday
- Vanuatu
- Easter Monday
- Mayotte
- Easter Monday
- South Africa
- Family Day
- Zambia
- Easter Monday
- Zimbabwe
- Easter Monday
April 23, 1957
- Spain
- Día de Aragón (AR)
- Fiesta de Castilla y León (CL)
- New Zealand
- Provincial anniversary day
- Turkey
- National Sovereignty and Children's Day
April 24, 1957
- Armenia
- Mother's Day
- Faroe Islands
- Flag Day
- Republic of the Niger
- Concord Day
April 25, 1957
- Australia
- Anzac Day
- Cocos (Keeling) Islands
- Anzac Day
- Cook Islands
- Anzac Day
- Christmas Island
- Anzac Day
- Egypt
- Sinai Liberation Day
- Italia
- Liberation Day
- New Zealand
- ANZAC Day
- Portugal
- Liberty Day
- Swaziland
- National Flag Day
- Tonga
- ANZAC Day
April 26, 1957
- Malaysia
- Sultan of Terengganu's Birthday
- Tanzania
- Union Day
- United States of America
- Arbor Day
April 27, 1957
- Aruba
- Kings Day
- Caribbean Netherlands
- Kings Day
- Curaçao
- Kings Day
- France
- Abolition of Slavery
- Slovenia
- Day of Uprising Against Occupation
- Sierra Leone
- Independence Day
- Sint Maarten
- King's Day
- Togolese Republic
- Independence Day
- Mayotte
- Abolition of Slavery
- South Africa
- Freedom Day
April 29, 1957
- Dominican Republic
- Labour Day
- Japan
- Emperor's Birthday
- Moldova
- Memorial Day
- United States of America
- Confederate Memorial Day
April 30, 1957
- Caribbean Netherlands
- Rincon Day
- Belarus
- Commemoration Day
- Netherlands
- Queen's Day
- Sint Maarten
- Carnival
- Vietnam
- Day of liberating the South for national reunification
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