May 1, 1951
- Andorra
- Labour Day
- Antigua & Barbuda
- Labour Day
- Anguilla
- Labour Day
- Albania
- Labour Day
- Armenia
- Labour Day
- Angola
- Labour Day
- Argentina
- Labour Day
- Austria
- Staatsfeiertag
- Aruba
- Labour Day
- Åland Islands
- Labour Day
- Bosnia and Herzegovina
- Labour Day
- Barbados
- May Day
- People's Republic of Bangladesh
- May Day
- Belgium
- Labour Day
- Burkina Faso
- Labour Day
- Bulgaria
- Labour Day
- Bahrain
- Labour Day
- Burundi
- Labour Day
- Benin
- Labour Day
- St. Barths
- Labour Day
- Bolivia
- Labour Day
- Caribbean Netherlands
- Labour Day
- Brazil
- Labour Day
- Botswana
- Labour Day
- Belarus
- Labour Day
- Belize
- Labour Day
- Democratic Republic of the Congo
- Labour Day
- Central African Republic
- Labour Day
- Republic of the Congo
- Labour Day
- Switzerland
- Labour Day (JU)
- Labour Day (VS)
- Republic of Côte d'Ivoire
- Labour Day
- Chile
- Labour Day
- Cameroon
- Labour Day
- China
- Labour Day
- Colombia
- Labour Day
- Costa Rica
- Labour Day
- Cuba
- Labour Day
- Cape Verde
- Labour Day
- Curaçao
- Labour Day
- Cyprus
- Labour Day
- Czech Republic
- Labour Day
- Germany
- Labour Day
- Djibouti
- Labour Day
- Dominica
- Labour Day
- Algeria
- Labour Day
- Ecuador
- Labour Day
- Estonia
- Labour Day
- Egypt
- Labour Day
- Eritrea
- Labour Day
- Spain
- Labour Day
- Finland
- Labour Day
- France
- Labour Day
- Gabon
- Labour Day
- Grenada
- Labour Day
- French Guiana
- Labour Day
- Ghana
- Labour Day
- Gibraltar
- May Day
- The Gambia
- Labour Day
- Guinea
- Labour Day
- Guadeloupe
- Labour Day
- Republic of Equatorial Guinea
- Labour Day
- Greece
- Labour Day
- Guatemala
- Labour Day
- Guinea-Bissau
- Labour Day
- Guyana
- Labour Day
- Hong Kong
- Labour Day
- Honduras
- Labour Day
- Croatia
- Labour Day
- Haiti
- Labour Day
- Hungary
- Labour Day
- Canary Islands
- Labour Day
- Indonesia
- Labour Day
- Iceland
- Labour Day
- Italia
- Labour Day
- Kenya
- Labour Day
- Comoros
- Labour Day
- St. Lucia
- Labour Day
- Lichtenstein
- Labour Day
- Lesotho
- Workers' Day
- Lithuania
- Labour Day
- Luxembourg
- Labour Day
- Latvia
- Labour Day
- Libya
- Labour Day
- Kingdom of Morocco
- Labour Day
- Monaco
- Labour Day
- Moldova
- Labour Day
- Montenegro
- Labour Day
- St. Martin
- Labour Day
- Madagascar
- Labour Day
- Macedonia
- Labour Day
- Republic of Mali
- Labour Day
- Martinique
- Labour Day
- Mauritania
- Labour Day
- Malta
- Labour Day
- Malawi
- Labour Day
- Mexico
- Labour Day
- Malaysia
- Labour Day
- Mozambique
- Workers' Day
- Namibia
- Workers Day
- New Caledonia
- Labour Day
- Republic of the Niger
- Labour Day
- Nigeria
- Worker's Day
- Nicaragua
- Labour Day
- Norway
- Labour Day
- Panama
- Labour Day
- Peru
- Labour Day
- Philippines
- Labour Day
- Poland
- Labour Day
- St. Pierre & Miquelon
- Labour Day
- Portugal
- Labour Day
- Paraguay
- Labour Day
- Réunion
- Labour Day
- Romania
- Labour Day
- Serbia
- Labour Day
- Russia
- Spring and Labour Day
- Rwanda
- Labour Day
- Seychelles
- Labour Day
- Sweden
- Labour Day
- Singapore
- Labour Day
- Slovenia
- Labour Day
- Svalbard & Jan Mayen
- Labour Day
- Slovakia
- Labour Day
- San Marino
- Labour Day
- Senegal
- Labour Day
- Somalia
- Labour Day
- Suriname
- Labour Day
- São Tomé & Príncipe
- Labour Day
- El Salvador
- Labour Day
- Sint Maarten
- Labour Day
- Swaziland
- Labour Day
- Chad
- Labour Day
- Togolese Republic
- Labour Day
- Tunisia
- Labour Day
- Turkey
- Labour and Solidarity Day
- Tanzania
- Labour Day
- Ukraine
- Labour Day
- Uganda
- Labour Day
- Uruguay
- Labour Day
- Vatican City
- Saint Joseph the Worker
- St. Vincent & Grenadines
- Labour Day
- Venezuela
- Labour Day
- Vietnam
- Labour Day
- Vanuatu
- Labour Day
- Kosovo
- Labour Day
- Mayotte
- Labour Day
- South Africa
- Workers' Day
- Zambia
- Labour Day
- Zimbabwe
- Labour Day
- Jordan
- Labor Day
May 2, 1951
- Bosnia and Herzegovina
- 2nd day of the Labour Day
- Spain
- Día de la Comunidad de Madrid
- Montenegro
- Labour Day
- Serbia
- Labour Day
- Slovenia
- Labour Day
- Ukraine
- Labour Day
May 3, 1951
- Austria
- Ascension Day
- Aruba
- Ascension Day
- Åland Islands
- Ascension Day
- Belgium
- Ascension Day
- Burkina Faso
- Ascension Day
- Burundi
- Ascension Day
- Benin
- Ascension Day
- St. Barths
- Ascension Day
- Caribbean Netherlands
- Ascension Day
- Botswana
- Ascension Day
- Central African Republic
- Ascension Day
- Republic of the Congo
- Ascension Day
- Switzerland
- Ascension Day
- Republic of Côte d'Ivoire
- Ascension Day
- Cameroon
- Ascension Day
- Curaçao
- Ascension Day
- Germany
- Ascension Day
- Denmark
- Ascension Day
- Finland
- Ascension Day
- Faroe Islands
- Ascension Day
- France
- Ascension Day
- French Guiana
- Ascension Day
- Greenland
- Ascension Day
- Guadeloupe
- Ascension Day
- Haiti
- Ascension Day
- Indonesia
- Ascension Day
- Iceland
- Ascension Day
- Japan
- Constitution Day
- Lichtenstein
- Ascension Day
- Lesotho
- Ascension Day
- Luxembourg
- Ascension Day
- Monaco
- Ascension Day
- St. Martin
- Ascension Day
- Madagascar
- Ascension Day
- Martinique
- Ascension Day
- Namibia
- Ascension Day
- New Caledonia
- Ascension Day
- Netherlands
- Ascension Day
- Norway
- Ascension Day
- Poland
- Constitution Day
- St. Pierre & Miquelon
- Ascension Day
- Réunion
- Ascension Day
- Sweden
- Ascension Day
- St. Helena
- Ascension Day
- Svalbard & Jan Mayen
- Ascension Day
- Senegal
- Ascension Day
- Sint Maarten
- Ascension Day
- Swaziland
- Ascension Day
- Togolese Republic
- Ascension Day
- Vatican City
- Ascension Day
- Vanuatu
- Ascension Day
- Mayotte
- Ascension Day
May 5, 1951
- Guyana
- Arrival Day
- Japan
- Children's Day
- South Korea
- Children's Day
May 6, 1951
- Bulgaria
- St. George's Day
May 7, 1951
- Australia
- May Day (NT)
- Labour Day (QLD)
- Colombia
- Ascension Day
- United Kingdom
- Early May bank holiday
- Guernsey
- Early May bank holiday
- Ireland
- May Day
- Isle of Man
- Early May bank holiday
- Jersey
- Early May bank holiday
- St. Kitts & Nevis
- Labour Day
- Moldova
- Memorial Day
- Montserrat
- Labour Day
May 8, 1951
- St. Barths
- Victory Day
- Belarus
- Commemoration Day
- Czech Republic
- Liberation Day
- France
- Victory Day
- French Guiana
- Victory Day
- Guadeloupe
- Victory Day
- St. Martin
- Victory Day
- Martinique
- Victory Day
- New Caledonia
- Victory Day
- St. Pierre & Miquelon
- Victory Day
- Réunion
- Victory Day
- Slovakia
- Day of victory over fascism
- United States of America
- Primary Election Day (IN)
- Truman Day (MO)
- Mayotte
- Victory Day
May 10, 1951
- Western Sahara
- May 20 Revolution
- United States of America
- Confederate Memorial Day
May 12, 1951
- Georgia
- Saint Andrew the First-Called Day
May 13, 1951
- Andorra
- Pentecost
- Austria
- Pentecost
- Barbados
- Pentecost
- Burkina Faso
- Pentecost
- Republic of the Congo
- Pentecost
- Switzerland
- Pentecost
- Denmark
- Pentecost
- Estonia
- Pentecost
- Finland
- Pentecost
- Faroe Islands
- Pentecost
- Greenland
- Pentecost
- Hong Kong
- Birthday of the Buddha
- Hungary
- Pentecost
- Iceland
- Pentecost
- South Korea
- Buddha's Birthday
- Netherlands
- Pentecost
- Norway
- Pentecost
- Poland
- Pentecost
- Sweden
- Pentecost
- Slovenia
- Pentecost
- Svalbard & Jan Mayen
- Pentecost
- Sint Maarten
- Pentecost
May 14, 1951
- Andorra
- Whit Monday
- Antigua & Barbuda
- Whit Monday
- Anguilla
- Whit Monday
- Austria
- Whit Monday
- Barbados
- Whit Monday
- Belgium
- Whit Monday
- Benin
- Whit Monday
- St. Barths
- Whit Monday
- Bahamas
- Whit Monday
- Central African Republic
- Whit Monday
- Republic of the Congo
- Whit Monday
- Switzerland
- Whit Monday
- Republic of Côte d'Ivoire
- Whit Monday
- Germany
- Whit Monday
- Denmark
- Whit Monday
- Dominica
- Whit Monday
- Spain
- Whit Monday
- Faroe Islands
- Whit Monday
- France
- Whit Monday
- Gabon
- Whit Monday
- Grenada
- Whit Monday
- French Guiana
- Whit Monday
- Greenland
- Whit Monday
- Guadeloupe
- Whit Monday
- Hong Kong
- Birthday of the Buddha
- Hungary
- Whit Monday
- Iceland
- Whit Monday
- Italia
- Whit Monday
- St. Kitts & Nevis
- Whit Monday
- St. Lucia
- Whit Monday
- Lichtenstein
- Whit Monday
- Liberia
- National Unification Day
- Luxembourg
- Whit Monday
- Monaco
- Whit Monday
- St. Martin
- Whit Monday
- Madagascar
- Whit Monday
- Martinique
- Whit Monday
- Montserrat
- Whit Monday
- Malawi
- Kamuzu Day
- New Caledonia
- Whit Monday
- Netherlands
- Whit Monday
- Norway
- Whit Monday
- St. Pierre & Miquelon
- Whit Monday
- Paraguay
- Independence Day
- Réunion
- Whit Monday
- St. Helena
- Whit Monday
- Svalbard & Jan Mayen
- Whit Monday
- Senegal
- Whit Monday
- Togolese Republic
- Whit Monday
- St. Vincent & Grenadines
- Whit Monday
- British Virgin Islands
- Whit Monday
- Mayotte
- Whit Monday
May 15, 1951
- Paraguay
- Independence Day
May 16, 1951
- South Sudan
- SPLA Day
May 17, 1951
- Democratic Republic of the Congo
- Liberation Day
- Spain
- Día de las Letras Gallegas
- Norway
- Constitution Day
- Svalbard & Jan Mayen
- Constitution Day
May 19, 1951
- People's Republic of Bangladesh
- Buddha's Birthday
- Cape Verde
- Dia do Município da Praia
- Turkey
- Commemoration of Atatürk, Youth and Sports Day
- United States of America
- Malcolm X Day
May 20, 1951
- Cameroon
- National Day
May 21, 1951
- Belize
- Commonwealth Day, Sovereign's Day
- Canada
- Victoria Day
- National Patriots' Day (QC)
- Chile
- Navy Day
- Cayman Islands
- Discovery Day
- Montenegro
- Independence Day
- St. Helena
- Saint Helena Day
May 22, 1951
- France
- Abolition of Slavery
- Montenegro
- Independence Day
- Martinique
- Abolition of Slavery
- Malaysia
- Hari Hol of Pahang
May 23, 1951
- Jamaica
- Labour Day
May 24, 1951
- Austria
- Corpus Christi
- Bosnia and Herzegovina
- Corpus Christi
- Bulgaria
- Bulgarian Education and Culture, and Slavonic Literature Day
- Bolivia
- Corpus Christi
- Switzerland
- Corpus Christi
- Germany
- Corpus Christi
- Dominican Republic
- Corpus Christi
- Ecuador
- The Battle of Pichincha
- Eritrea
- Independence Day
- Spain
- Corpus Christi
- Grenada
- Corpus Christi
- Republic of Equatorial Guinea
- Corpus Christi
- Croatia
- Corpus Christi
- Haiti
- Corpus Christi
- St. Lucia
- Corpus Christi
- Lichtenstein
- Corpus Christi
- Monaco
- Corpus Christi
- Macedonia
- Saints Cyril and Methodius Day
- Poland
- Corpus Christi
- Portugal
- Corpus Christi
- Seychelles
- Corpus Christi
- San Marino
- Corpus Christi
- Trinidad & Tobago
- Corpus Christi
- Vatican City
- Corpus Christi
May 25, 1951
- Argentina
- Day of the First National Government
- Bermuda
- Bermuda Day
- Bolivia
- Chuquisaca Day
- The Gambia
- Africa Day
- Guinea
- Africa Day
- Lichtenstein
- Feiertagsbrücke
- Lesotho
- Africa Day/ Heroes' Day
- Madagascar
- Africa Day
- Republic of Mali
- Jour de l'Afrique
- Mauritania
- Africa Day
- Namibia
- Africa Day
- Zambia
- African Freedom Day
- Zimbabwe
- Africa Day
- Jordan
- Independence Day
May 27, 1951
- France
- Abolition of Slavery (GP)
- abolition of slavery (MF)
- Guadeloupe
- Abolition of Slavery
- St. Martin
- abolition of slavery
- Nigeria
- Children's Day
May 28, 1951
- Armenia
- Republic Day
- American Samoa
- Memorial Day
- Australia
- Reconciliation Day
- Azerbaijan
- Republic Day
- Colombia
- Corpus Christi
- Ethiopia
- Derg Downfall Day
- United Kingdom
- Spring bank holiday
- Guernsey
- Spring bank holiday
- Gibraltar
- Spring bank holiday
- Guam
- Memorial Day
- Isle of Man
- Spring bank holiday
- Jersey
- Spring bank holiday
- Puerto Rico
- Memorial Day
- Turks & Caicos Islands
- National Heroes' Day
- United States of America
- Memorial Day
- Venezuela
- Natalicio de Jacinto Lara
- U.S. Virgin Islands
- Memorial Day
May 29, 1951
- Nigeria
- Democracy Day
May 30, 1951
- Anguilla
- Anguilla Day
- Spain
- Canary Islands Day
- Canary Islands
- Canary Islands Day
- Malaysia
- Tadau Kaamatan
- Trinidad & Tobago
- Indian Arrival Day
May 31, 1951
- Malaysia
- Tadau Kaamatan
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