| Date | Country | Holiday name |
|---|---|---|
| 2031-05-01 |  Andorra | Labour Day |
| 2031-05-01 |  Antigua & Barbuda | Labour Day |
| 2031-05-01 |  Anguilla | Labour Day |
| 2031-05-01 |  Albania | Labour Day |
| 2031-05-01 |  Armenia | Labour Day |
| 2031-05-01 |  Angola | Labour Day |
| 2031-05-01 |  Argentina | Labour Day |
| 2031-05-01 |  Austria | Staatsfeiertag |
| 2031-05-01 |  Aruba | Labour Day |
| 2031-05-01 |  Ã…land Islands | Labour Day |
| 2031-05-01 |  Bosnia and Herzegovina | Labour Day |
| 2031-05-01 |  Barbados | May Day |
| 2031-05-01 |  People's Republic of Bangladesh | May Day |
| 2031-05-01 |  Belgium | Labour Day |
| 2031-05-01 |  Burkina Faso | Labour Day |
| 2031-05-01 |  Bulgaria | Labour Day |
| 2031-05-01 |  Bahrain | Labour Day |
| 2031-05-01 |  Burundi | Labour Day |
| 2031-05-01 |  Benin | Labour Day |
| 2031-05-01 |  St. Barths | Labour Day |
| 2031-05-01 |  Bolivia | Labour Day |
| 2031-05-01 |  Caribbean Netherlands | Labour Day |
| 2031-05-01 |  Brazil | Labour Day |
| 2031-05-01 |  Botswana | Labour Day |
| 2031-05-01 |  Belarus | Labour Day |
| 2031-05-01 |  Belize | Labour Day |
| 2031-05-01 |  Democratic Republic of the Congo | Labour Day |
| 2031-05-01 |  Central African Republic | Labour Day |
| 2031-05-01 |  Republic of the Congo | Labour Day |
| 2031-05-01 |  Switzerland | Labour Day (JU) |
| 2031-05-01 |  Republic of Côte d'Ivoire | Labour Day |
| 2031-05-01 |  Chile | Labour Day |
| 2031-05-01 |  Cameroon | Labour Day |
| 2031-05-01 |  China | Labour Day |
| 2031-05-01 |  Colombia | Labour Day |
| 2031-05-01 |  Costa Rica | Labour Day |
| 2031-05-01 |  Cuba | Labour Day |
| 2031-05-01 |  Cape Verde | Labour Day |
| 2031-05-01 |  Curaçao | Labour Day |
| 2031-05-01 |  Cyprus | Labour Day |
| 2031-05-01 |  Czech Republic | Labour Day |
| 2031-05-01 |  Germany | Labour Day |
| 2031-05-01 |  Djibouti | Labour Day |
| 2031-05-01 |  Dominica | Labour Day |
| 2031-05-01 |  Algeria | Labour Day |
| 2031-05-01 |  Ecuador | Labour Day |
| 2031-05-01 |  Estonia | Labour Day |
| 2031-05-01 |  Egypt | Labour Day |
| 2031-05-01 |  Eritrea | Labour Day |
| 2031-05-01 |  Spain | Labour Day |
| 2031-05-01 |  Finland | Labour Day |
| 2031-05-01 |  France | Labour Day |
| 2031-05-01 |  Gabon | Labour Day |
| 2031-05-01 |  Grenada | Labour Day |
| 2031-05-01 |  French Guiana | Labour Day |
| 2031-05-01 |  Ghana | Labour Day |
| 2031-05-01 |  Gibraltar | May Day |
| 2031-05-01 |  The Gambia | Labour Day |
| 2031-05-01 |  Guinea | Labour Day |
| 2031-05-01 |  Guadeloupe | Labour Day |
| 2031-05-01 |  Republic of Equatorial Guinea | Labour Day |
| 2031-05-01 |  Greece | Labour Day |
| 2031-05-01 |  Guatemala | Labour Day |
| 2031-05-01 |  Guinea-Bissau | Labour Day |
| 2031-05-01 |  Guyana | Labour Day |
| 2031-05-01 |  Hong Kong | Labour Day |
| 2031-05-01 |  Honduras | Labour Day |
| 2031-05-01 |  Croatia | Labour Day |
| 2031-05-01 |  Haiti | Labour Day |
| 2031-05-01 |  Hungary | Labour Day |
| 2031-05-01 | Canary Islands | Labour Day |
| 2031-05-01 |  Indonesia | Labour Day |
| 2031-05-01 |  Iceland | Labour Day |
| 2031-05-01 |  Italia | Labour Day |
| 2031-05-01 |  Kenya | Labour Day |
| 2031-05-01 |  Comoros | Labour Day |
| 2031-05-01 |  St. Lucia | Labour Day |
| 2031-05-01 |  Lichtenstein | Labour Day |
| 2031-05-01 |  Lesotho | Workers' Day |
| 2031-05-01 |  Lithuania | Labour Day |
| 2031-05-01 |  Luxembourg | Labour Day |
| 2031-05-01 |  Latvia | Labour Day |
| 2031-05-01 |  Libya | Labour Day |
| 2031-05-01 |  Kingdom of Morocco | Labour Day |
| 2031-05-01 |  Monaco | Labour Day |
| 2031-05-01 |  Moldova | Labour Day |
| 2031-05-01 |  Montenegro | Labour Day |
| 2031-05-01 |  St. Martin | Labour Day |
| 2031-05-01 |  Madagascar | Labour Day |
| 2031-05-01 |  Macedonia | Labour Day |
| 2031-05-01 |  Republic of Mali | Labour Day |
| 2031-05-01 |  Martinique | Labour Day |
| 2031-05-01 |  Mauritania | Labour Day |
| 2031-05-01 |  Malta | Labour Day |
| 2031-05-01 |  Malawi | Labour Day |
| 2031-05-01 |  Mexico | Labour Day |
| 2031-05-01 |  Malaysia | Labour Day |
| 2031-05-01 |  Mozambique | Workers' Day |
| 2031-05-01 |  Namibia | Workers Day |
| 2031-05-01 |  New Caledonia | Labour Day |
| 2031-05-01 |  Republic of the Niger | Labour Day |
| 2031-05-01 |  Nigeria | Worker's Day |
| 2031-05-01 |  Nicaragua | Labour Day |
| 2031-05-01 |  Norway | Labour Day |
| 2031-05-01 |  Panama | Labour Day |
| 2031-05-01 |  Peru | Labour Day |
| 2031-05-01 |  Philippines | Labour Day |
| 2031-05-01 |  Poland | Labour Day |
| 2031-05-01 |  St. Pierre & Miquelon | Labour Day |
| 2031-05-01 |  Portugal | Labour Day |
| 2031-05-01 |  Paraguay | Labour Day |
| 2031-05-01 |  Réunion | Labour Day |
| 2031-05-01 |  Romania | Labour Day |
| 2031-05-01 |  Serbia | Labour Day |
| 2031-05-01 |  Russia | Spring and Labour Day |
| 2031-05-01 |  Rwanda | Labour Day |
| 2031-05-01 |  Seychelles | Labour Day |
| 2031-05-01 |  Sweden | Labour Day |
| 2031-05-01 |  Singapore | Labour Day |
| 2031-05-01 |  Slovenia | Labour Day |
| 2031-05-01 |  Svalbard & Jan Mayen | Labour Day |
| 2031-05-01 |  Slovakia | Labour Day |
| 2031-05-01 |  San Marino | Labour Day |
| 2031-05-01 |  Senegal | Labour Day |
| 2031-05-01 |  Somalia | Labour Day |
| 2031-05-01 |  Suriname | Labour Day |
| 2031-05-01 |  São Tomé & PrÃncipe | Labour Day |
| 2031-05-01 |  El Salvador | Labour Day |
| 2031-05-01 |  Sint Maarten | Labour Day |
| 2031-05-01 |  Swaziland | Labour Day |
| 2031-05-01 |  Chad | Labour Day |
| 2031-05-01 |  Togolese Republic | Labour Day |
| 2031-05-01 |  Tunisia | Labour Day |
| 2031-05-01 |  Turkey | Labour and Solidarity Day |
| 2031-05-01 |  Tanzania | Labour Day |
| 2031-05-01 |  Ukraine | Labour Day |
| 2031-05-01 |  Uganda | Labour Day |
| 2031-05-01 |  Uruguay | Labour Day |
| 2031-05-01 |  Vatican City | Saint Joseph the Worker |
| 2031-05-01 |  St. Vincent & Grenadines | Labour Day |
| 2031-05-01 |  Venezuela | Labour Day |
| 2031-05-01 |  Vietnam | Labour Day |
| 2031-05-01 |  Vanuatu | Labour Day |
| 2031-05-01 |  Kosovo | Labour Day |
| 2031-05-01 |  Mayotte | Labour Day |
| 2031-05-01 |  South Africa | Workers' Day |
| 2031-05-01 |  Zambia | Labour Day |
| 2031-05-01 |  Zimbabwe | Labour Day |
| 2031-05-01 |  Cambodia | International Labor Day |
| 2031-05-01 |  Jordan | Labor Day |
| 2031-05-01 |  Kazakhstan | Kazakhstan's People Solidarity Holiday |
| 2031-05-01 |  Laos | International Labor Day |
| 2031-05-01 |  Timor Leste | World Labor Day |
| 2031-05-01 |  Iran | Tasoua |
| 2031-05-01 | Switzerland | Labour Day (VS) |
| 2031-05-02 | Argentina | Bridge Day |
| 2031-05-02 | Bosnia and Herzegovina | 2nd day of the Labour Day |
| 2031-05-02 | Spain | DÃa de la Comunidad de Madrid |
| 2031-05-02 | Montenegro | Labour Day |
| 2031-05-02 | Serbia | Labour Day |
| 2031-05-02 | Slovenia | Labour Day |
| 2031-05-02 | People's Republic of Bangladesh | Day of Ashura |
| 2031-05-02 | Bahrain | Day of Ashura |
| 2031-05-02 | Algeria | Day of Ashura |
| 2031-05-02 | The Gambia | Day of Ashura |
| 2031-05-02 | Iran | Ashoura |
| 2031-05-02 | Senegal | Day of Ashura |
| 2031-05-03 |  Japan | Constitution Day |
| 2031-05-03 | Poland | Constitution Day |
| 2031-05-04 | Austria | Florian |
| 2031-05-04 | Japan | Greenery Day |
| 2031-05-04 | Latvia | Restoration of Independence day |
| 2031-05-04 | Namibia | Cassinga Day |
| 2031-05-04 |  Thailand | Coronation Day |
| 2031-05-04 | China | Youth Day |
| 2031-05-05 |  Australia | May Day (NT) |
| 2031-05-05 | Australia | Labour Day (QLD) |
| 2031-05-05 |  Dominican Republic | Labour Day |
| 2031-05-05 |  United Kingdom | Early May bank holiday |
| 2031-05-05 |  Guernsey | Early May bank holiday |
| 2031-05-05 | Guyana | Arrival Day |
| 2031-05-05 |  Ireland | May Day |
| 2031-05-05 |  Isle of Man | Early May bank holiday |
| 2031-05-05 |  Jersey | Early May bank holiday |
| 2031-05-05 | Japan | Children's Day |
| 2031-05-05 |  St. Kitts & Nevis | Labour Day |
| 2031-05-05 |  South Korea | Children's Day |
| 2031-05-05 | Latvia | Restoration of Independence day (substitute day) |
| 2031-05-05 |  Montserrat | Labour Day |
| 2031-05-05 | Namibia | Public Holiday |
| 2031-05-05 | Cambodia | Visaka Bochea Day |
| 2031-05-06 | Bulgaria | St. George's Day |
| 2031-05-06 | Japan | Greenery Day (substitute day) |
| 2031-05-06 |  United States of America | Primary Election Day |
| 2031-05-07 | Kazakhstan | Defender of the Fatherland Day |
| 2031-05-08 | St. Barths | Victory Day |
| 2031-05-08 | Czech Republic | Liberation Day |
| 2031-05-08 | France | Victory Day |
| 2031-05-08 | French Guiana | Victory Day |
| 2031-05-08 | Guadeloupe | Victory Day |
| 2031-05-08 | St. Martin | Victory Day |
| 2031-05-08 | Martinique | Victory Day |
| 2031-05-08 | New Caledonia | Victory Day |
| 2031-05-08 | St. Pierre & Miquelon | Victory Day |
| 2031-05-08 | Réunion | Victory Day |
| 2031-05-08 | Slovakia | Day of victory over fascism |
| 2031-05-08 | United States of America | Truman Day |
| 2031-05-08 | Mayotte | Victory Day |
| 2031-05-09 | Armenia | Victory and Peace Day |
| 2031-05-09 |  Azerbaijan | Day of Victory over Fascism |
| 2031-05-09 | Bosnia and Herzegovina | Victory Day |
| 2031-05-09 | Belarus | Victory Day |
| 2031-05-09 |  Faroe Islands | Great Prayer Day |
| 2031-05-09 |  Georgia | Victory Day |
| 2031-05-09 | Guernsey | Liberation Day |
| 2031-05-09 |  Greenland | Prayer Day |
| 2031-05-09 | Jersey | Liberation Day |
| 2031-05-09 | Luxembourg | Europe Day |
| 2031-05-09 | Moldova | Victory Day |
| 2031-05-09 | Russia | Victory Day |
| 2031-05-09 | Ukraine | Victory Day |
| 2031-05-09 | Kosovo | Europe Day |
| 2031-05-09 | Cambodia | Royal Ploughing Ceremony |
| 2031-05-09 | Kazakhstan | Victory Day |
| 2031-05-09 |  Uzbekistan | Day of Memory and Honor |
| 2031-05-10 |  Western Sahara | May 20 Revolution |
| 2031-05-10 | United States of America | Confederate Memorial Day |
| 2031-05-12 | Georgia | Saint Andrew the First-Called Day |
| 2031-05-14 |  Liberia | National Unification Day |
| 2031-05-14 | Malawi | Kamuzu Day |
| 2031-05-14 | Paraguay | Independence Day |
| 2031-05-14 | Cambodia | HM King Norodom Sihamoni's Birthday |
| 2031-05-15 | Paraguay | Independence Day |
| 2031-05-16 |  South Sudan | SPLA Day |
| 2031-05-17 | Democratic Republic of the Congo | Liberation Day |
| 2031-05-17 | Spain | DÃa de las Letras Gallegas |
| 2031-05-17 | Norway | Constitution Day |
| 2031-05-17 | Svalbard & Jan Mayen | Constitution Day |
| 2031-05-18 | Haiti | Flag and Universities' Day |
| 2031-05-18 | Somalia | Restoration of Somaliland Sovereignty |
| 2031-05-19 | People's Republic of Bangladesh | Buddha's Birthday |
| 2031-05-19 |  Canada | Victoria Day |
| 2031-05-19 | Canada | National Patriots' Day (QC) |
| 2031-05-19 | Cape Verde | Dia do MunicÃpio da Praia |
| 2031-05-19 |  Cayman Islands | Discovery Day |
| 2031-05-19 | Turkey | Commemoration of Atatürk, Youth and Sports Day |
| 2031-05-19 | United States of America | Malcolm X Day |
| 2031-05-20 | Cameroon | National Day |
| 2031-05-20 | Timor Leste | Restoration of Independence Day |
| 2031-05-21 | Chile | Navy Day |
| 2031-05-21 | Montenegro | Independence Day |
| 2031-05-21 |  St. Helena | Saint Helena Day |
| 2031-05-22 | Austria | Ascension Day |
| 2031-05-22 | Aruba | Ascension Day |
| 2031-05-22 | Ã…land Islands | Ascension Day |
| 2031-05-22 | Belgium | Ascension Day |
| 2031-05-22 | Burkina Faso | Ascension Day |
| 2031-05-22 | Burundi | Ascension Day |
| 2031-05-22 | Benin | Ascension Day |
| 2031-05-22 | St. Barths | Ascension Day |
| 2031-05-22 | Caribbean Netherlands | Ascension Day |
| 2031-05-22 | Botswana | Ascension Day |
| 2031-05-22 | Central African Republic | Ascension Day |
| 2031-05-22 | Republic of the Congo | Ascension Day |
| 2031-05-22 | Switzerland | Ascension Day |
| 2031-05-22 | Republic of Côte d'Ivoire | Ascension Day |
| 2031-05-22 | Cameroon | Ascension Day |
| 2031-05-22 | Curaçao | Ascension Day |
| 2031-05-22 | Germany | Ascension Day |
| 2031-05-22 |  Denmark | Ascension Day |
| 2031-05-22 | Finland | Ascension Day |
| 2031-05-22 | Faroe Islands | Ascension Day |
| 2031-05-22 | France | Ascension Day |
| 2031-05-22 | France | Abolition of Slavery (MQ) |
| 2031-05-22 | French Guiana | Ascension Day |
| 2031-05-22 | Greenland | Ascension Day |
| 2031-05-22 | Guadeloupe | Ascension Day |
| 2031-05-22 | Haiti | Ascension Day |
| 2031-05-22 | Indonesia | Ascension Day |
| 2031-05-22 | Iceland | Ascension Day |
| 2031-05-22 | Lichtenstein | Ascension Day |
| 2031-05-22 | Lesotho | Ascension Day |
| 2031-05-22 | Luxembourg | Ascension Day |
| 2031-05-22 | Monaco | Ascension Day |
| 2031-05-22 | Montenegro | Independence Day |
| 2031-05-22 | St. Martin | Ascension Day |
| 2031-05-22 | Madagascar | Ascension Day |
| 2031-05-22 | Martinique | Abolition of Slavery |
| 2031-05-22 | Martinique | Ascension Day |
| 2031-05-22 | Malaysia | Hari Hol of Pahang |
| 2031-05-22 | Namibia | Ascension Day |
| 2031-05-22 | New Caledonia | Ascension Day |
| 2031-05-22 |  Netherlands | Ascension Day |
| 2031-05-22 | Norway | Ascension Day |
| 2031-05-22 | St. Pierre & Miquelon | Ascension Day |
| 2031-05-22 | Réunion | Ascension Day |
| 2031-05-22 | Sweden | Ascension Day |
| 2031-05-22 | St. Helena | Ascension Day |
| 2031-05-22 | Svalbard & Jan Mayen | Ascension Day |
| 2031-05-22 | Senegal | Ascension Day |
| 2031-05-22 | Sint Maarten | Ascension Day |
| 2031-05-22 | Swaziland | Ascension Day |
| 2031-05-22 | Togolese Republic | Ascension Day |
| 2031-05-22 | Vanuatu | Ascension Day |
| 2031-05-22 | Mayotte | Ascension Day |
| 2031-05-23 |  Jamaica | Labour Day |
| 2031-05-23 | Lichtenstein | Feiertagsbrücke |
| 2031-05-24 | Bulgaria | Bulgarian Education and Culture, and Slavonic Literature Day |
| 2031-05-24 | Ecuador | The Battle of Pichincha |
| 2031-05-24 | Eritrea | Independence Day |
| 2031-05-24 | Macedonia | Saints Cyril and Methodius Day |
| 2031-05-25 | Argentina | Day of the First National Government |
| 2031-05-25 | Bolivia | Chuquisaca Day |
| 2031-05-25 | The Gambia | Africa Day |
| 2031-05-25 | Guinea | Africa Day |
| 2031-05-25 | Lesotho | Africa Day/ Heroes' Day |
| 2031-05-25 | Madagascar | Africa Day |
| 2031-05-25 | Republic of Mali | Jour de l'Afrique |
| 2031-05-25 | Mauritania | Africa Day |
| 2031-05-25 | Namibia | Africa Day |
| 2031-05-25 | Zambia | African Freedom Day |
| 2031-05-25 | Zimbabwe | Africa Day |
| 2031-05-25 | Jordan | Independence Day |
| 2031-05-26 |  American Samoa | Memorial Day |
| 2031-05-26 | Bolivia | Chuquisaca Day (substitutes) |
| 2031-05-26 | Belize | Commonwealth Day, Sovereign's Day |
| 2031-05-26 | Colombia | Ascension Day |
| 2031-05-26 | United Kingdom | Spring bank holiday |
| 2031-05-26 | Georgia | Independence Day |
| 2031-05-26 | Guernsey | Spring bank holiday |
| 2031-05-26 | Gibraltar | Spring bank holiday |
| 2031-05-26 |  Guam | Memorial Day |
| 2031-05-26 | Guyana | Independence Day |
| 2031-05-26 | Isle of Man | Spring bank holiday |
| 2031-05-26 | Jersey | Spring bank holiday |
| 2031-05-26 | Namibia | Public Holiday |
| 2031-05-26 |  Puerto Rico | Memorial Day |
| 2031-05-26 |  Turks & Caicos Islands | National Heroes' Day |
| 2031-05-26 | United States of America | Memorial Day |
| 2031-05-26 |  U.S. Virgin Islands | Memorial Day |
| 2031-05-26 | Zambia | African Freedom Day (substitute day) |
| 2031-05-27 | France | Abolition of Slavery (GP) |
| 2031-05-27 | France | abolition of slavery (MF) |
| 2031-05-27 | Guadeloupe | Abolition of Slavery |
| 2031-05-27 | St. Martin | abolition of slavery |
| 2031-05-27 | Nigeria | Children's Day |
| 2031-05-27 | Malaysia | Hari Hol of Sultan Iskandar of Johor |
| 2031-05-28 | Armenia | Republic Day |
| 2031-05-28 | Azerbaijan | Republic Day |
| 2031-05-28 |  Ethiopia | Derg Downfall Day |
| 2031-05-28 | Hong Kong | Birthday of the Buddha |
| 2031-05-28 | South Korea | Buddha's Birthday |
| 2031-05-28 | Venezuela | Natalicio de Jacinto Lara |
| 2031-05-28 |  Israel | Shavuot (Feast of Weeks) |
| 2031-05-30 | Anguilla | Anguilla Day |
| 2031-05-30 |  Bermuda | Bermuda Day |
| 2031-05-30 | Spain | Canary Islands Day |
| 2031-05-30 | Croatia | National Day |
| 2031-05-30 | Canary Islands | Canary Islands Day |
| 2031-05-30 | Malaysia | Tadau Kaamatan |
| 2031-05-30 |  Trinidad & Tobago | Indian Arrival Day |
| 2031-05-31 | Spain | DÃa de Castilla-La Mancha |
| 2031-05-31 | Malaysia | Tadau Kaamatan |
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