| Date | Country | Holiday name |
|---|---|---|
| 1988-05-01 |  Andorra | Labour Day |
| 1988-05-01 |  Antigua & Barbuda | Labour Day |
| 1988-05-01 |  Anguilla | Labour Day |
| 1988-05-01 |  Albania | Labour Day |
| 1988-05-01 |  Armenia | Labour Day |
| 1988-05-01 |  Angola | Labour Day |
| 1988-05-01 |  Argentina | Labour Day |
| 1988-05-01 |  Austria | Staatsfeiertag |
| 1988-05-01 |  Åland Islands | Labour Day |
| 1988-05-01 |  Bosnia and Herzegovina | Labour Day |
| 1988-05-01 |  People's Republic of Bangladesh | May Day |
| 1988-05-01 |  Belgium | Labour Day |
| 1988-05-01 |  Burkina Faso | Labour Day |
| 1988-05-01 |  Bulgaria | Labour Day |
| 1988-05-01 |  Bahrain | Labour Day |
| 1988-05-01 |  Burundi | Labour Day |
| 1988-05-01 |  Benin | Labour Day |
| 1988-05-01 |  St. Barths | Labour Day |
| 1988-05-01 |  Bolivia | Labour Day |
| 1988-05-01 |  Brazil | Labour Day |
| 1988-05-01 |  Botswana | Labour Day |
| 1988-05-01 |  Belarus | Labour Day |
| 1988-05-01 |  Democratic Republic of the Congo | Labour Day |
| 1988-05-01 |  Central African Republic | Labour Day |
| 1988-05-01 |  Republic of the Congo | Labour Day |
| 1988-05-01 |  Switzerland | Labour Day (JU) |
| 1988-05-01 |  Republic of Côte d'Ivoire | Labour Day |
| 1988-05-01 |  Chile | Labour Day |
| 1988-05-01 |  China | Labour Day |
| 1988-05-01 |  Colombia | Labour Day |
| 1988-05-01 |  Costa Rica | Labour Day |
| 1988-05-01 |  Cuba | Labour Day |
| 1988-05-01 |  Cape Verde | Labour Day |
| 1988-05-01 |  Cyprus | Labour Day |
| 1988-05-01 |  Czech Republic | Labour Day |
| 1988-05-01 |  Germany | Labour Day |
| 1988-05-01 |  Djibouti | Labour Day |
| 1988-05-01 |  Dominica | Labour Day |
| 1988-05-01 |  Algeria | Labour Day |
| 1988-05-01 |  Ecuador | Labour Day |
| 1988-05-01 |  Estonia | Labour Day |
| 1988-05-01 |  Egypt | Labour Day |
| 1988-05-01 |  Eritrea | Labour Day |
| 1988-05-01 |  Spain | Labour Day |
| 1988-05-01 |  Finland | Labour Day |
| 1988-05-01 |  France | Labour Day |
| 1988-05-01 |  Gabon | Labour Day |
| 1988-05-01 |  Grenada | Labour Day |
| 1988-05-01 |  French Guiana | Labour Day |
| 1988-05-01 |  Ghana | Labour Day |
| 1988-05-01 |  The Gambia | Labour Day |
| 1988-05-01 |  Guinea | Labour Day |
| 1988-05-01 |  Guadeloupe | Labour Day |
| 1988-05-01 |  Republic of Equatorial Guinea | Labour Day |
| 1988-05-01 |  Greece | Labour Day |
| 1988-05-01 |  Guatemala | Labour Day |
| 1988-05-01 |  Guinea-Bissau | Labour Day |
| 1988-05-01 |  Guyana | Labour Day |
| 1988-05-01 |  Hong Kong | Labour Day |
| 1988-05-01 |  Honduras | Labour Day |
| 1988-05-01 |  Croatia | Labour Day |
| 1988-05-01 |  Haiti | Labour Day |
| 1988-05-01 |  Hungary | Labour Day |
| 1988-05-01 | Canary Islands | Labour Day |
| 1988-05-01 |  Indonesia | Labour Day |
| 1988-05-01 |  Iceland | Labour Day |
| 1988-05-01 |  Italia | Labour Day |
| 1988-05-01 |  Kenya | Labour Day |
| 1988-05-01 |  Comoros | Labour Day |
| 1988-05-01 |  St. Lucia | Labour Day |
| 1988-05-01 |  Lichtenstein | Labour Day |
| 1988-05-01 |  Lesotho | Workers' Day |
| 1988-05-01 |  Lithuania | Labour Day |
| 1988-05-01 |  Luxembourg | Labour Day |
| 1988-05-01 |  Latvia | Labour Day |
| 1988-05-01 |  Libya | Labour Day |
| 1988-05-01 |  Kingdom of Morocco | Labour Day |
| 1988-05-01 |  Monaco | Labour Day |
| 1988-05-01 |  Moldova | Labour Day |
| 1988-05-01 |  Montenegro | Labour Day |
| 1988-05-01 |  St. Martin | Labour Day |
| 1988-05-01 |  Madagascar | Labour Day |
| 1988-05-01 |  Macedonia | Labour Day |
| 1988-05-01 |  Republic of Mali | Labour Day |
| 1988-05-01 |  Martinique | Labour Day |
| 1988-05-01 |  Mauritania | Labour Day |
| 1988-05-01 |  Malta | Labour Day |
| 1988-05-01 |  Malawi | Labour Day |
| 1988-05-01 |  Mexico | Labour Day |
| 1988-05-01 |  Malaysia | Labour Day |
| 1988-05-01 |  Mozambique | Workers' Day |
| 1988-05-01 |  Namibia | Workers Day |
| 1988-05-01 |  New Caledonia | Labour Day |
| 1988-05-01 |  Republic of the Niger | Labour Day |
| 1988-05-01 |  Nigeria | Worker's Day |
| 1988-05-01 |  Nicaragua | Labour Day |
| 1988-05-01 |  Norway | Labour Day |
| 1988-05-01 |  Panama | Labour Day |
| 1988-05-01 |  Peru | Labour Day |
| 1988-05-01 |  Philippines | Labour Day |
| 1988-05-01 |  Poland | Labour Day |
| 1988-05-01 |  St. Pierre & Miquelon | Labour Day |
| 1988-05-01 |  Portugal | Labour Day |
| 1988-05-01 |  Paraguay | Labour Day |
| 1988-05-01 |  Réunion | Labour Day |
| 1988-05-01 |  Romania | Labour Day |
| 1988-05-01 |  Russia | Spring and Labour Day |
| 1988-05-01 |  Rwanda | Labour Day |
| 1988-05-01 |  Seychelles | Labour Day |
| 1988-05-01 |  Sweden | Labour Day |
| 1988-05-01 |  Singapore | Labour Day |
| 1988-05-01 |  Slovenia | Labour Day |
| 1988-05-01 |  Svalbard & Jan Mayen | Labour Day |
| 1988-05-01 |  Slovakia | Labour Day |
| 1988-05-01 |  San Marino | Labour Day |
| 1988-05-01 |  Senegal | Labour Day |
| 1988-05-01 |  Somalia | Labour Day |
| 1988-05-01 |  Suriname | Labour Day |
| 1988-05-01 |  São Tomé & Príncipe | Labour Day |
| 1988-05-01 |  El Salvador | Labour Day |
| 1988-05-01 |  Swaziland | Labour Day |
| 1988-05-01 |  Chad | Labour Day |
| 1988-05-01 |  Togolese Republic | Labour Day |
| 1988-05-01 |  Tunisia | Labour Day |
| 1988-05-01 |  Turkey | Labour and Solidarity Day |
| 1988-05-01 |  Tanzania | Labour Day |
| 1988-05-01 |  Ukraine | Labour Day |
| 1988-05-01 |  Uganda | Labour Day |
| 1988-05-01 |  Uruguay | Labour Day |
| 1988-05-01 |  Vatican City | Saint Joseph the Worker |
| 1988-05-01 |  St. Vincent & Grenadines | Labour Day |
| 1988-05-01 |  Venezuela | Labour Day |
| 1988-05-01 |  Vietnam | Labour Day |
| 1988-05-01 |  Vanuatu | Labour Day |
| 1988-05-01 |  Kosovo | Labour Day |
| 1988-05-01 |  Mayotte | Labour Day |
| 1988-05-01 |  South Africa | Workers' Day |
| 1988-05-01 |  Zambia | Labour Day |
| 1988-05-01 |  Zimbabwe | Labour Day |
| 1988-05-01 |  Jordan | Labor Day |
| 1988-05-01 |  Laos | International Labor Day |
| 1988-05-01 | Switzerland | Labour Day (VS) |
| 1988-05-02 | Albania | Labour Day (substitute day) |
| 1988-05-02 |  Australia | May Day (NT) |
| 1988-05-02 | Australia | Labour Day (QLD) |
| 1988-05-02 |  Aruba | Labour Day |
| 1988-05-02 | Bosnia and Herzegovina | 2nd day of the Labour Day |
| 1988-05-02 |  Barbados | May Day |
| 1988-05-02 | Bolivia | Labour Day (substitutes) |
| 1988-05-02 |  Caribbean Netherlands | Labour Day |
| 1988-05-02 | Botswana | Public Holiday |
| 1988-05-02 |  Belize | Labour Day |
| 1988-05-02 | Democratic Republic of the Congo | Labour Day (substitute day) |
| 1988-05-02 |  Cameroon | Labour Day |
| 1988-05-02 |  Curaçao | Labour Day |
| 1988-05-02 |  Dominican Republic | Labour Day |
| 1988-05-02 | Spain | Labour Day (substitute day) (MC) |
| 1988-05-02 | Spain | Día de la Comunidad de Madrid (MD) |
| 1988-05-02 |  United Kingdom | Early May bank holiday |
| 1988-05-02 |  Guernsey | Early May bank holiday |
| 1988-05-02 | Ghana | Labour Day (substitute day) |
| 1988-05-02 |  Gibraltar | May Day |
| 1988-05-02 | Republic of Equatorial Guinea | Labour Day (substitute day) |
| 1988-05-02 | Hong Kong | Labour Day (substitute day) |
| 1988-05-02 |  Ireland | May Day |
| 1988-05-02 |  Isle of Man | Early May bank holiday |
| 1988-05-02 |  Jersey | Early May bank holiday |
| 1988-05-02 | Kenya | Labour Day (substitute day) |
| 1988-05-02 |  St. Kitts & Nevis | Labour Day |
| 1988-05-02 | Monaco | Labour Day (substitute day) |
| 1988-05-02 | Montenegro | Labour Day |
| 1988-05-02 | Macedonia | Labour Day (substitute day) |
| 1988-05-02 |  Montserrat | Labour Day |
| 1988-05-02 | Malawi | Labour Day |
| 1988-05-02 | Malaysia | Labour Day (substitute day) |
| 1988-05-02 | Mozambique | Public Holiday |
| 1988-05-02 | Namibia | Public Holiday |
| 1988-05-02 | Panama | Labour Day (substitute day) |
| 1988-05-02 |  Serbia | Labour Day |
| 1988-05-02 | Singapore | Labour Day (substitute day) |
| 1988-05-02 | Slovenia | Labour Day |
| 1988-05-02 | São Tomé & Príncipe | Labour Day (substitute day) |
| 1988-05-02 |  Sint Maarten | Labour Day |
| 1988-05-02 | Swaziland | Labour Day (substitute day) |
| 1988-05-02 | Chad | Labour Day |
| 1988-05-02 | Ukraine | Labour Day |
| 1988-05-02 | St. Vincent & Grenadines | Labour Day (substitute day) |
| 1988-05-02 | South Africa | Public Holiday |
| 1988-05-02 | Zambia | Labour Day (substitute day) |
| 1988-05-03 | Bosnia and Herzegovina | Labour Day (substitute day) |
| 1988-05-03 |  Japan | Constitution Day |
| 1988-05-03 | Montenegro | Labour Day (substitute day) |
| 1988-05-03 | Poland | Constitution Day |
| 1988-05-03 | Serbia | Labour Day |
| 1988-05-03 | Ukraine | Labour Day (substitute day) |
| 1988-05-03 |  United States of America | Primary Election Day |
| 1988-05-03 |  Brunei | Nuzul Al-Quran |
| 1988-05-03 | Malaysia | Day of Nuzul Al-Quran |
| 1988-05-04 | Austria | Florian |
| 1988-05-04 | Japan | Citizens' Holiday |
| 1988-05-04 | Latvia | Restoration of Independence day |
| 1988-05-04 | Namibia | Cassinga Day |
| 1988-05-04 |  Thailand | Coronation Day |
| 1988-05-04 | China | Youth Day |
| 1988-05-05 | Guyana | Arrival Day |
| 1988-05-05 | Japan | Children's Day |
| 1988-05-05 |  South Korea | Children's Day |
| 1988-05-06 | Bulgaria | St. George's Day |
| 1988-05-07 |  Iran | Martyrdom of Imam Ali |
| 1988-05-08 | St. Barths | Victory Day |
| 1988-05-08 | Czech Republic | Liberation Day |
| 1988-05-08 | France | Victory Day |
| 1988-05-08 | French Guiana | Victory Day |
| 1988-05-08 | Guadeloupe | Victory Day |
| 1988-05-08 | St. Martin | Victory Day |
| 1988-05-08 | Martinique | Victory Day |
| 1988-05-08 | New Caledonia | Victory Day |
| 1988-05-08 | St. Pierre & Miquelon | Victory Day |
| 1988-05-08 | Réunion | Victory Day |
| 1988-05-08 | Slovakia | Day of victory over fascism |
| 1988-05-08 | United States of America | Truman Day (MO) |
| 1988-05-08 | Mayotte | Victory Day |
| 1988-05-09 | Armenia | Victory and Peace Day |
| 1988-05-09 |  Azerbaijan | Day of Victory over Fascism |
| 1988-05-09 | Bosnia and Herzegovina | Victory Day |
| 1988-05-09 | Belarus | Victory Day |
| 1988-05-09 |  Georgia | Victory Day |
| 1988-05-09 | Guernsey | Liberation Day |
| 1988-05-09 | Jersey | Liberation Day |
| 1988-05-09 | Moldova | Victory Day |
| 1988-05-09 | Russia | Victory Day |
| 1988-05-09 | Ukraine | Victory Day |
| 1988-05-09 | Kosovo | Europe Day |
| 1988-05-09 | The Gambia | Lailat al-Qadr |
| 1988-05-10 |  Western Sahara | May 20 Revolution |
| 1988-05-10 | United States of America | Confederate Memorial Day |
| 1988-05-12 | Austria | Ascension Day |
| 1988-05-12 | Aruba | Ascension Day |
| 1988-05-12 | Åland Islands | Ascension Day |
| 1988-05-12 | Belgium | Ascension Day |
| 1988-05-12 | Burkina Faso | Ascension Day |
| 1988-05-12 | Burundi | Ascension Day |
| 1988-05-12 | Benin | Ascension Day |
| 1988-05-12 | St. Barths | Ascension Day |
| 1988-05-12 | Caribbean Netherlands | Ascension Day |
| 1988-05-12 | Botswana | Ascension Day |
| 1988-05-12 | Central African Republic | Ascension Day |
| 1988-05-12 | Republic of the Congo | Ascension Day |
| 1988-05-12 | Switzerland | Ascension Day |
| 1988-05-12 | Republic of Côte d'Ivoire | Ascension Day |
| 1988-05-12 | Cameroon | Ascension Day |
| 1988-05-12 | Curaçao | Ascension Day |
| 1988-05-12 | Germany | Ascension Day |
| 1988-05-12 |  Denmark | Ascension Day |
| 1988-05-12 | Finland | Ascension Day |
| 1988-05-12 |  Faroe Islands | Ascension Day |
| 1988-05-12 | France | Ascension Day |
| 1988-05-12 | Georgia | Saint Andrew the First-Called Day |
| 1988-05-12 | French Guiana | Ascension Day |
| 1988-05-12 |  Greenland | Ascension Day |
| 1988-05-12 | Guadeloupe | Ascension Day |
| 1988-05-12 | Haiti | Ascension Day |
| 1988-05-12 | Indonesia | Ascension Day |
| 1988-05-12 | Iceland | Ascension Day |
| 1988-05-12 | Lichtenstein | Ascension Day |
| 1988-05-12 | Lesotho | Ascension Day |
| 1988-05-12 | Luxembourg | Ascension Day |
| 1988-05-12 | Monaco | Ascension Day |
| 1988-05-12 | St. Martin | Ascension Day |
| 1988-05-12 | Madagascar | Ascension Day |
| 1988-05-12 | Martinique | Ascension Day |
| 1988-05-12 | Namibia | Ascension Day |
| 1988-05-12 | New Caledonia | Ascension Day |
| 1988-05-12 |  Netherlands | Ascension Day |
| 1988-05-12 | Norway | Ascension Day |
| 1988-05-12 | St. Pierre & Miquelon | Ascension Day |
| 1988-05-12 | Réunion | Ascension Day |
| 1988-05-12 | Sweden | Ascension Day |
| 1988-05-12 |  St. Helena | Ascension Day |
| 1988-05-12 | Svalbard & Jan Mayen | Ascension Day |
| 1988-05-12 | Senegal | Ascension Day |
| 1988-05-12 | Sint Maarten | Ascension Day |
| 1988-05-12 | Swaziland | Ascension Day |
| 1988-05-12 | Togolese Republic | Ascension Day |
| 1988-05-12 | Vatican City | Ascension Day |
| 1988-05-12 | Vanuatu | Ascension Day |
| 1988-05-12 | Mayotte | Ascension Day |
| 1988-05-13 | Lichtenstein | Feiertagsbrücke |
| 1988-05-13 | Republic of Côte d'Ivoire | Laylat al-Qadr |
| 1988-05-13 | Guinea | Laylat al-Qadr |
| 1988-05-13 | Republic of the Niger | Laylat al-Qadr |
| 1988-05-14 |  Liberia | National Unification Day |
| 1988-05-14 | Malawi | Kamuzu Day |
| 1988-05-14 | Paraguay | Independence Day |
| 1988-05-15 | Paraguay | Independence Day |
| 1988-05-16 | Colombia | Ascension Day |
| 1988-05-16 |  Cayman Islands | Discovery Day |
| 1988-05-16 | Malawi | Kamuzu Day (substitute day) |
| 1988-05-16 |  South Sudan | SPLA Day |
| 1988-05-16 | Jordan | Eid al-Fitr (estimated) |
| 1988-05-16 |  Kuwait | Eid al-Fitr (estimated) |
| 1988-05-16 |  Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1988-05-16 |  United Arab Emirates | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Albania | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Azerbaijan | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Bosnia and Herzegovina | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | People's Republic of Bangladesh | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Burkina Faso | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Bahrain | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Burundi | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Benin | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Brunei | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 |  Cocos (Keeling) Islands | Hari Raya Puasa |
| 1988-05-16 | Central African Republic | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Republic of Côte d'Ivoire | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Cameroon | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 |  Christmas Island | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Djibouti | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Algeria | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Egypt | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Western Sahara | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Eritrea | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Spain | End of Ramadan (Eid al-Fitr) (ML) |
| 1988-05-16 |  Ethiopia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Gabon | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Ghana | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | The Gambia | Korité |
| 1988-05-16 | Guinea | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Guinea-Bissau | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Indonesia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Iran | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Kenya | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Comoros | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Libya | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Kingdom of Morocco | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Montenegro | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Madagascar | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Macedonia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Republic of Mali | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Mauritania | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Malawi | Eid al Fitri |
| 1988-05-16 | Malaysia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Republic of the Niger | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Nigeria | Id el Fitr |
| 1988-05-16 | Philippines | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Rwanda | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 |  Sudan | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Singapore | Hari Raya Puasa |
| 1988-05-16 |  Sierra Leone | Korité |
| 1988-05-16 | Senegal | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Somalia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Suriname | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Chad | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Tunisia | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Turkey | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 |  Trinidad & Tobago | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Tanzania | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Uganda | End of Ramadan (Eid al-Fitr) |
| 1988-05-16 | Kosovo | End of Ramadan (Eid al-Fitr) |
| 1988-05-17 | Democratic Republic of the Congo | Liberation Day |
| 1988-05-17 | Spain | Día de las Letras Gallegas |
| 1988-05-17 | Norway | Constitution Day |
| 1988-05-17 | Svalbard & Jan Mayen | Constitution Day |
| 1988-05-17 | Jordan | Eid al-Fitr Holiday (estimated) |
| 1988-05-17 | Kuwait | Eid al-Fitr Holiday (estimated) |
| 1988-05-17 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1988-05-17 | Azerbaijan | End of Ramadan (Eid al-Fitr) |
| 1988-05-17 | Indonesia | End of Ramadan (Eid al-Fitr) |
| 1988-05-17 | Iran | Holyday for Fetr Eeid |
| 1988-05-17 | Malaysia | End of Ramadan (Eid al-Fitr) |
| 1988-05-17 | South Sudan | End of Ramadan (Eid al-Fitr) |
| 1988-05-17 | Togolese Republic | End of Ramadan (Eid al-Fitr) |
| 1988-05-18 | Haiti | Flag and Universities' Day |
| 1988-05-18 | Somalia | Restoration of Somaliland Sovereignty |
| 1988-05-18 | Jordan | Eid al-Fitr Holiday (estimated) |
| 1988-05-18 | Kuwait | Eid al-Fitr Holiday (estimated) |
| 1988-05-18 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1988-05-19 | People's Republic of Bangladesh | Buddha's Birthday |
| 1988-05-19 | Cape Verde | Dia do Município da Praia |
| 1988-05-19 | Turkey | Commemoration of Atatürk, Youth and Sports Day |
| 1988-05-19 | United States of America | Malcolm X Day |
| 1988-05-19 | Saudi Arabia | Eid al-Fitr Holiday (estimated) |
| 1988-05-20 | Cameroon | National Day |
| 1988-05-21 | Chile | Navy Day |
| 1988-05-21 | Montenegro | Independence Day |
| 1988-05-21 | St. Helena | Saint Helena Day |
| 1988-05-21 | Saudi Arabia | Eid al-Fitr Holiday (observed, estimated) |
| 1988-05-22 | Andorra | Pentecost |
| 1988-05-22 | Austria | Pentecost |
| 1988-05-22 | Barbados | Pentecost |
| 1988-05-22 | Burkina Faso | Pentecost |
| 1988-05-22 | Republic of the Congo | Pentecost |
| 1988-05-22 | Switzerland | Pentecost |
| 1988-05-22 | Denmark | Pentecost |
| 1988-05-22 | Estonia | Pentecost |
| 1988-05-22 | Finland | Pentecost |
| 1988-05-22 | Faroe Islands | Pentecost |
| 1988-05-22 | France | Abolition of Slavery (MQ) |
| 1988-05-22 | Greenland | Pentecost |
| 1988-05-22 | Hungary | Pentecost |
| 1988-05-22 | Iceland | Pentecost |
| 1988-05-22 | Montenegro | Independence Day |
| 1988-05-22 | Martinique | Abolition of Slavery |
| 1988-05-22 | Malaysia | Hari Hol of Pahang |
| 1988-05-22 | Netherlands | Pentecost |
| 1988-05-22 | Norway | Pentecost |
| 1988-05-22 | Poland | Pentecost |
| 1988-05-22 | Sweden | Pentecost |
| 1988-05-22 | Slovenia | Pentecost |
| 1988-05-22 | Svalbard & Jan Mayen | Pentecost |
| 1988-05-22 | Sint Maarten | Pentecost |
| 1988-05-22 |  Israel | Shavuot (Feast of Weeks) |
| 1988-05-23 | Andorra | Whit Monday |
| 1988-05-23 | Antigua & Barbuda | Whit Monday |
| 1988-05-23 | Anguilla | Whit Monday |
| 1988-05-23 | Austria | Whit Monday |
| 1988-05-23 | Barbados | Whit Monday |
| 1988-05-23 | Belgium | Whit Monday |
| 1988-05-23 | Benin | Whit Monday |
| 1988-05-23 | St. Barths | Whit Monday |
| 1988-05-23 |  Bahamas | Whit Monday |
| 1988-05-23 | Belize | Commonwealth Day, Sovereign's Day |
| 1988-05-23 |  Canada | Victoria Day |
| 1988-05-23 | Canada | National Patriots' Day (QC) |
| 1988-05-23 | Central African Republic | Whit Monday |
| 1988-05-23 | Republic of the Congo | Whit Monday |
| 1988-05-23 | Switzerland | Whit Monday |
| 1988-05-23 | Republic of Côte d'Ivoire | Whit Monday |
| 1988-05-23 | Germany | Whit Monday |
| 1988-05-23 | Denmark | Whit Monday |
| 1988-05-23 | Dominica | Whit Monday |
| 1988-05-23 | Spain | Whit Monday |
| 1988-05-23 | Faroe Islands | Whit Monday |
| 1988-05-23 | France | Whit Monday |
| 1988-05-23 | Gabon | Whit Monday |
| 1988-05-23 | Grenada | Whit Monday |
| 1988-05-23 | French Guiana | Whit Monday |
| 1988-05-23 | Greenland | Whit Monday |
| 1988-05-23 | Guadeloupe | Whit Monday |
| 1988-05-23 | Hong Kong | Birthday of the Buddha |
| 1988-05-23 | Hungary | Whit Monday |
| 1988-05-23 | Iceland | Whit Monday |
| 1988-05-23 | Italia | Whit Monday |
| 1988-05-23 |  Jamaica | Labour Day |
| 1988-05-23 | St. Kitts & Nevis | Whit Monday |
| 1988-05-23 | South Korea | Buddha's Birthday |
| 1988-05-23 | St. Lucia | Whit Monday |
| 1988-05-23 | Lichtenstein | Whit Monday |
| 1988-05-23 | Luxembourg | Whit Monday |
| 1988-05-23 | Monaco | Whit Monday |
| 1988-05-23 | Montenegro | Independence Day (substitute day) |
| 1988-05-23 | St. Martin | Whit Monday |
| 1988-05-23 | Madagascar | Whit Monday |
| 1988-05-23 | Martinique | Whit Monday |
| 1988-05-23 | Montserrat | Whit Monday |
| 1988-05-23 | New Caledonia | Whit Monday |
| 1988-05-23 | Netherlands | Whit Monday |
| 1988-05-23 | Norway | Whit Monday |
| 1988-05-23 | St. Pierre & Miquelon | Whit Monday |
| 1988-05-23 | Réunion | Whit Monday |
| 1988-05-23 | St. Helena | Whit Monday |
| 1988-05-23 | Svalbard & Jan Mayen | Whit Monday |
| 1988-05-23 | Senegal | Whit Monday |
| 1988-05-23 | Togolese Republic | Whit Monday |
| 1988-05-23 | St. Vincent & Grenadines | Whit Monday |
| 1988-05-23 |  British Virgin Islands | Whit Monday |
| 1988-05-23 | Mayotte | Whit Monday |
| 1988-05-24 | Bulgaria | Bulgarian Education and Culture, and Slavonic Literature Day |
| 1988-05-24 | Ecuador | The Battle of Pichincha |
| 1988-05-24 | Eritrea | Independence Day |
| 1988-05-24 | Macedonia | Saints Cyril and Methodius Day |
| 1988-05-25 | Argentina | Day of the First National Government |
| 1988-05-25 | Bolivia | Chuquisaca Day |
| 1988-05-25 | The Gambia | Africa Day |
| 1988-05-25 | Guinea | Africa Day |
| 1988-05-25 | Lesotho | Africa Day/ Heroes' Day |
| 1988-05-25 | Madagascar | Africa Day |
| 1988-05-25 | Republic of Mali | Jour de l'Afrique |
| 1988-05-25 | Mauritania | Africa Day |
| 1988-05-25 | Namibia | Africa Day |
| 1988-05-25 | Zambia | African Freedom Day |
| 1988-05-25 | Zimbabwe | Africa Day |
| 1988-05-25 | Jordan | Independence Day |
| 1988-05-26 | Georgia | Independence Day |
| 1988-05-26 | Guyana | Independence Day |
| 1988-05-27 |  Bermuda | Bermuda Day |
| 1988-05-27 | France | Abolition of Slavery (GP) |
| 1988-05-27 | France | abolition of slavery (MF) |
| 1988-05-27 | Guadeloupe | Abolition of Slavery |
| 1988-05-27 | St. Martin | abolition of slavery |
| 1988-05-27 | Nigeria | Children's Day |
| 1988-05-28 | Armenia | Republic Day |
| 1988-05-28 | Azerbaijan | Republic Day |
| 1988-05-28 | Ethiopia | Derg Downfall Day |
| 1988-05-28 | Venezuela | Natalicio de Jacinto Lara |
| 1988-05-29 | Cyprus | Pentecost |
| 1988-05-29 | Greece | Pentecost |
| 1988-05-29 | Nigeria | Democracy Day |
| 1988-05-29 | Romania | Pentecost |
| 1988-05-29 | Ukraine | Pentecost |
| 1988-05-30 | Anguilla | Anguilla Day |
| 1988-05-30 |  American Samoa | Memorial Day |
| 1988-05-30 | Australia | Reconciliation Day |
| 1988-05-30 | Azerbaijan | Republic Day (substitute day) |
| 1988-05-30 | Spain | Canary Islands Day |
| 1988-05-30 | United Kingdom | Spring bank holiday |
| 1988-05-30 | Guernsey | Spring bank holiday |
| 1988-05-30 | Gibraltar | Spring bank holiday |
| 1988-05-30 | Greece | Whit Monday |
| 1988-05-30 |  Guam | Memorial Day |
| 1988-05-30 | Canary Islands | Canary Islands Day |
| 1988-05-30 | Isle of Man | Spring bank holiday |
| 1988-05-30 | Jersey | Spring bank holiday |
| 1988-05-30 | Malaysia | Tadau Kaamatan |
| 1988-05-30 |  Puerto Rico | Memorial Day |
| 1988-05-30 | Romania | Whit Monday |
| 1988-05-30 |  Turks & Caicos Islands | National Heroes' Day |
| 1988-05-30 | Trinidad & Tobago | Indian Arrival Day |
| 1988-05-30 | Ukraine | Pentecost |
| 1988-05-30 | United States of America | Memorial Day |
| 1988-05-30 |  U.S. Virgin Islands | Memorial Day |
| 1988-05-31 | Malaysia | Tadau Kaamatan |
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