| Date | Country | Holiday name |
|---|---|---|
| 1978-05-01 |  Andorra | Labour Day |
| 1978-05-01 |  Antigua & Barbuda | Labour Day |
| 1978-05-01 |  Anguilla | Labour Day |
| 1978-05-01 |  Albania | Orthodox Easter |
| 1978-05-01 | Albania | Labour Day |
| 1978-05-01 |  Armenia | Labour Day |
| 1978-05-01 |  Angola | Labour Day |
| 1978-05-01 |  Argentina | Labour Day |
| 1978-05-01 |  Austria | Staatsfeiertag |
| 1978-05-01 |  Australia | May Day (NT) |
| 1978-05-01 | Australia | Labour Day (QLD) |
| 1978-05-01 |  Aruba | Labour Day |
| 1978-05-01 |  Åland Islands | Labour Day |
| 1978-05-01 |  Bosnia and Herzegovina | Labour Day |
| 1978-05-01 |  Barbados | May Day |
| 1978-05-01 |  People's Republic of Bangladesh | May Day |
| 1978-05-01 |  Belgium | Labour Day |
| 1978-05-01 |  Burkina Faso | Labour Day |
| 1978-05-01 |  Bulgaria | Labour Day |
| 1978-05-01 | Bulgaria | Easter Monday |
| 1978-05-01 |  Bahrain | Labour Day |
| 1978-05-01 |  Burundi | Labour Day |
| 1978-05-01 |  Benin | Labour Day |
| 1978-05-01 |  St. Barths | Labour Day |
| 1978-05-01 |  Bolivia | Labour Day |
| 1978-05-01 |  Caribbean Netherlands | Labour Day |
| 1978-05-01 |  Brazil | Labour Day |
| 1978-05-01 |  Botswana | Labour Day |
| 1978-05-01 |  Belarus | Labour Day |
| 1978-05-01 |  Belize | Labour Day |
| 1978-05-01 |  Democratic Republic of the Congo | Labour Day |
| 1978-05-01 |  Central African Republic | Labour Day |
| 1978-05-01 |  Republic of the Congo | Labour Day |
| 1978-05-01 |  Switzerland | Labour Day (JU) |
| 1978-05-01 |  Republic of Côte d'Ivoire | Labour Day |
| 1978-05-01 |  Chile | Labour Day |
| 1978-05-01 |  Cameroon | Labour Day |
| 1978-05-01 |  China | Labour Day |
| 1978-05-01 |  Colombia | Labour Day |
| 1978-05-01 |  Costa Rica | Labour Day |
| 1978-05-01 |  Cuba | Labour Day |
| 1978-05-01 |  Cape Verde | Labour Day |
| 1978-05-01 |  Curaçao | Labour Day |
| 1978-05-01 |  Cyprus | Labour Day |
| 1978-05-01 | Cyprus | Easter Monday |
| 1978-05-01 |  Czech Republic | Labour Day |
| 1978-05-01 |  Germany | Labour Day |
| 1978-05-01 |  Djibouti | Labour Day |
| 1978-05-01 |  Dominica | Labour Day |
| 1978-05-01 |  Dominican Republic | Labour Day |
| 1978-05-01 |  Algeria | Labour Day |
| 1978-05-01 |  Ecuador | Labour Day |
| 1978-05-01 |  Estonia | Labour Day |
| 1978-05-01 |  Egypt | Labour Day |
| 1978-05-01 | Egypt | Sham El Nessim |
| 1978-05-01 |  Eritrea | Labour Day |
| 1978-05-01 |  Spain | Labour Day |
| 1978-05-01 |  Finland | Labour Day |
| 1978-05-01 |  France | Labour Day |
| 1978-05-01 |  Gabon | Labour Day |
| 1978-05-01 |  United Kingdom | Early May bank holiday |
| 1978-05-01 |  Grenada | Labour Day |
| 1978-05-01 |  Georgia | Easter Monday |
| 1978-05-01 |  French Guiana | Labour Day |
| 1978-05-01 |  Guernsey | Early May bank holiday |
| 1978-05-01 |  Ghana | Labour Day |
| 1978-05-01 |  Gibraltar | May Day |
| 1978-05-01 |  The Gambia | Labour Day |
| 1978-05-01 |  Guinea | Labour Day |
| 1978-05-01 |  Guadeloupe | Labour Day |
| 1978-05-01 |  Republic of Equatorial Guinea | Labour Day |
| 1978-05-01 |  Greece | Labour Day |
| 1978-05-01 | Greece | Easter Monday |
| 1978-05-01 |  Guatemala | Labour Day |
| 1978-05-01 |  Guinea-Bissau | Labour Day |
| 1978-05-01 |  Guyana | Labour Day |
| 1978-05-01 |  Hong Kong | Labour Day |
| 1978-05-01 |  Honduras | Labour Day |
| 1978-05-01 |  Croatia | Labour Day |
| 1978-05-01 |  Haiti | Labour Day |
| 1978-05-01 |  Hungary | Labour Day |
| 1978-05-01 | Canary Islands | Labour Day |
| 1978-05-01 |  Indonesia | Labour Day |
| 1978-05-01 |  Ireland | May Day |
| 1978-05-01 |  Isle of Man | Early May bank holiday |
| 1978-05-01 |  Iceland | Labour Day |
| 1978-05-01 |  Italia | Labour Day |
| 1978-05-01 |  Jersey | Early May bank holiday |
| 1978-05-01 |  Kenya | Labour Day |
| 1978-05-01 |  Comoros | Labour Day |
| 1978-05-01 |  St. Kitts & Nevis | Labour Day |
| 1978-05-01 |  St. Lucia | Labour Day |
| 1978-05-01 |  Lichtenstein | Labour Day |
| 1978-05-01 |  Lesotho | Workers' Day |
| 1978-05-01 |  Lithuania | Labour Day |
| 1978-05-01 |  Luxembourg | Labour Day |
| 1978-05-01 |  Latvia | Labour Day |
| 1978-05-01 |  Libya | Labour Day |
| 1978-05-01 |  Kingdom of Morocco | Labour Day |
| 1978-05-01 |  Monaco | Labour Day |
| 1978-05-01 |  Moldova | Labour Day |
| 1978-05-01 | Moldova | Easter Monday |
| 1978-05-01 |  Montenegro | Labour Day |
| 1978-05-01 |  St. Martin | Labour Day |
| 1978-05-01 |  Madagascar | Labour Day |
| 1978-05-01 |  Macedonia | Orthodox Easter Monday |
| 1978-05-01 | Macedonia | Labour Day |
| 1978-05-01 |  Republic of Mali | Labour Day |
| 1978-05-01 |  Martinique | Labour Day |
| 1978-05-01 |  Mauritania | Labour Day |
| 1978-05-01 |  Montserrat | Labour Day |
| 1978-05-01 |  Malta | Labour Day |
| 1978-05-01 |  Malawi | Labour Day |
| 1978-05-01 |  Mexico | Labour Day |
| 1978-05-01 |  Malaysia | Labour Day |
| 1978-05-01 |  Mozambique | Workers' Day |
| 1978-05-01 |  Namibia | Workers Day |
| 1978-05-01 |  New Caledonia | Labour Day |
| 1978-05-01 |  Republic of the Niger | Labour Day |
| 1978-05-01 |  Nigeria | Worker's Day |
| 1978-05-01 |  Nicaragua | Labour Day |
| 1978-05-01 |  Netherlands | Queen's Day |
| 1978-05-01 |  Norway | Labour Day |
| 1978-05-01 |  Panama | Labour Day |
| 1978-05-01 |  Peru | Labour Day |
| 1978-05-01 |  Philippines | Labour Day |
| 1978-05-01 |  Poland | Labour Day |
| 1978-05-01 |  St. Pierre & Miquelon | Labour Day |
| 1978-05-01 |  Portugal | Labour Day |
| 1978-05-01 |  Paraguay | Labour Day |
| 1978-05-01 |  Réunion | Labour Day |
| 1978-05-01 |  Romania | Labour Day |
| 1978-05-01 | Romania | Easter Monday |
| 1978-05-01 |  Serbia | Orthodox Easter Monday |
| 1978-05-01 | Serbia | Labour Day |
| 1978-05-01 |  Russia | Spring and Labour Day |
| 1978-05-01 |  Rwanda | Labour Day |
| 1978-05-01 |  Seychelles | Labour Day |
| 1978-05-01 |  Sweden | Labour Day |
| 1978-05-01 |  Singapore | Labour Day |
| 1978-05-01 |  Slovenia | Labour Day |
| 1978-05-01 |  Svalbard & Jan Mayen | Labour Day |
| 1978-05-01 |  Slovakia | Labour Day |
| 1978-05-01 |  San Marino | Labour Day |
| 1978-05-01 |  Senegal | Labour Day |
| 1978-05-01 |  Somalia | Labour Day |
| 1978-05-01 |  Suriname | Labour Day |
| 1978-05-01 |  São Tomé & Príncipe | Labour Day |
| 1978-05-01 |  El Salvador | Labour Day |
| 1978-05-01 |  Sint Maarten | Labour Day |
| 1978-05-01 |  Swaziland | Labour Day |
| 1978-05-01 |  Chad | Labour Day |
| 1978-05-01 |  Togolese Republic | Labour Day |
| 1978-05-01 |  Tunisia | Labour Day |
| 1978-05-01 |  Turkey | Labour and Solidarity Day |
| 1978-05-01 |  Tanzania | Labour Day |
| 1978-05-01 |  Ukraine | Orthodox Easter |
| 1978-05-01 | Ukraine | Labour Day |
| 1978-05-01 |  Uganda | Labour Day |
| 1978-05-01 |  Uruguay | Labour Day |
| 1978-05-01 |  Vatican City | Saint Joseph the Worker |
| 1978-05-01 |  St. Vincent & Grenadines | Labour Day |
| 1978-05-01 |  Venezuela | Labour Day |
| 1978-05-01 |  Vietnam | Labour Day |
| 1978-05-01 |  Vanuatu | Labour Day |
| 1978-05-01 |  Kosovo | Labour Day |
| 1978-05-01 |  Mayotte | Labour Day |
| 1978-05-01 |  South Africa | Workers' Day |
| 1978-05-01 |  Zambia | Labour Day |
| 1978-05-01 |  Zimbabwe | Labour Day |
| 1978-05-01 |  Jordan | Labor Day |
| 1978-05-01 |  Laos | International Labor Day |
| 1978-05-01 | Switzerland | Labour Day (VS) |
| 1978-05-02 | Bosnia and Herzegovina | 2nd day of the Labour Day |
| 1978-05-02 | Spain | Día de la Comunidad de Madrid |
| 1978-05-02 | Montenegro | Labour Day |
| 1978-05-02 | Serbia | Labour Day |
| 1978-05-02 | Slovenia | Labour Day |
| 1978-05-02 | Sint Maarten | Carnival |
| 1978-05-02 | Ukraine | Labour Day |
| 1978-05-02 |  United States of America | Primary Election Day |
| 1978-05-03 |  Japan | Constitution Day |
| 1978-05-03 | Poland | Constitution Day |
| 1978-05-04 | Austria | Ascension Day |
| 1978-05-04 | Austria | Florian (4) |
| 1978-05-04 | Aruba | Ascension Day |
| 1978-05-04 | Åland Islands | Ascension Day |
| 1978-05-04 | Belgium | Ascension Day |
| 1978-05-04 | Burkina Faso | Ascension Day |
| 1978-05-04 | Burundi | Ascension Day |
| 1978-05-04 | Benin | Ascension Day |
| 1978-05-04 | St. Barths | Ascension Day |
| 1978-05-04 | Caribbean Netherlands | Ascension Day |
| 1978-05-04 | Botswana | Ascension Day |
| 1978-05-04 | Central African Republic | Ascension Day |
| 1978-05-04 | Republic of the Congo | Ascension Day |
| 1978-05-04 | Switzerland | Ascension Day |
| 1978-05-04 | Republic of Côte d'Ivoire | Ascension Day |
| 1978-05-04 | Cameroon | Ascension Day |
| 1978-05-04 | Curaçao | Ascension Day |
| 1978-05-04 | Germany | Ascension Day |
| 1978-05-04 |  Denmark | Ascension Day |
| 1978-05-04 | Finland | Ascension Day |
| 1978-05-04 |  Faroe Islands | Ascension Day |
| 1978-05-04 | France | Ascension Day |
| 1978-05-04 | French Guiana | Ascension Day |
| 1978-05-04 |  Greenland | Ascension Day |
| 1978-05-04 | Guadeloupe | Ascension Day |
| 1978-05-04 | Haiti | Ascension Day |
| 1978-05-04 | Indonesia | Ascension Day |
| 1978-05-04 | Iceland | Ascension Day |
| 1978-05-04 | Lichtenstein | Ascension Day |
| 1978-05-04 | Lesotho | Ascension Day |
| 1978-05-04 | Luxembourg | Ascension Day |
| 1978-05-04 | Latvia | Restoration of Independence day |
| 1978-05-04 | Monaco | Ascension Day |
| 1978-05-04 | St. Martin | Ascension Day |
| 1978-05-04 | Madagascar | Ascension Day |
| 1978-05-04 | Martinique | Ascension Day |
| 1978-05-04 | Namibia | Cassinga Day |
| 1978-05-04 | Namibia | Ascension Day |
| 1978-05-04 | New Caledonia | Ascension Day |
| 1978-05-04 | Netherlands | Ascension Day |
| 1978-05-04 | Norway | Ascension Day |
| 1978-05-04 | St. Pierre & Miquelon | Ascension Day |
| 1978-05-04 | Réunion | Ascension Day |
| 1978-05-04 | Sweden | Ascension Day |
| 1978-05-04 |  St. Helena | Ascension Day |
| 1978-05-04 | Svalbard & Jan Mayen | Ascension Day |
| 1978-05-04 | Senegal | Ascension Day |
| 1978-05-04 | Sint Maarten | Ascension Day |
| 1978-05-04 | Swaziland | Ascension Day |
| 1978-05-04 | Togolese Republic | Ascension Day |
| 1978-05-04 |  Thailand | Coronation Day |
| 1978-05-04 | Vatican City | Ascension Day |
| 1978-05-04 | Vanuatu | Ascension Day |
| 1978-05-04 | Mayotte | Ascension Day |
| 1978-05-04 | China | Youth Day |
| 1978-05-05 | Guyana | Arrival Day |
| 1978-05-05 | Japan | Children's Day |
| 1978-05-05 |  South Korea | Children's Day |
| 1978-05-05 | Lichtenstein | Feiertagsbrücke |
| 1978-05-06 | Bulgaria | St. George's Day |
| 1978-05-08 | St. Barths | Victory Day |
| 1978-05-08 | Colombia | Ascension Day |
| 1978-05-08 | Czech Republic | Liberation Day |
| 1978-05-08 | France | Victory Day |
| 1978-05-08 | French Guiana | Victory Day |
| 1978-05-08 | Guadeloupe | Victory Day |
| 1978-05-08 | Moldova | Memorial Day |
| 1978-05-08 | St. Martin | Victory Day |
| 1978-05-08 | Martinique | Victory Day |
| 1978-05-08 | New Caledonia | Victory Day |
| 1978-05-08 | St. Pierre & Miquelon | Victory Day |
| 1978-05-08 | Réunion | Victory Day |
| 1978-05-08 | Slovakia | Day of victory over fascism |
| 1978-05-08 | United States of America | Truman Day |
| 1978-05-08 | Mayotte | Victory Day |
| 1978-05-09 | Armenia | Victory and Peace Day |
| 1978-05-09 |  Azerbaijan | Day of Victory over Fascism |
| 1978-05-09 | Bosnia and Herzegovina | Victory Day |
| 1978-05-09 | Belarus | Victory Day |
| 1978-05-09 | Belarus | Commemoration Day |
| 1978-05-09 | Georgia | Victory Day |
| 1978-05-09 | Guernsey | Liberation Day |
| 1978-05-09 | Jersey | Liberation Day |
| 1978-05-09 | Moldova | Victory Day |
| 1978-05-09 | Russia | Victory Day |
| 1978-05-09 | Ukraine | Victory Day |
| 1978-05-09 | Kosovo | Europe Day |
| 1978-05-10 |  Western Sahara | May 20 Revolution |
| 1978-05-10 | United States of America | Confederate Memorial Day |
| 1978-05-10 |  Iran | Martyrdom of Fatima-Zahara |
| 1978-05-11 |  Israel | Independence Day (Yom HaAtzmaut) |
| 1978-05-12 | Georgia | Saint Andrew the First-Called Day |
| 1978-05-14 | Andorra | Pentecost |
| 1978-05-14 | Austria | Pentecost |
| 1978-05-14 | Barbados | Pentecost |
| 1978-05-14 | Burkina Faso | Pentecost |
| 1978-05-14 | Republic of the Congo | Pentecost |
| 1978-05-14 | Switzerland | Pentecost |
| 1978-05-14 | Denmark | Pentecost |
| 1978-05-14 | Estonia | Pentecost |
| 1978-05-14 | Finland | Pentecost |
| 1978-05-14 | Faroe Islands | Pentecost |
| 1978-05-14 | Greenland | Pentecost |
| 1978-05-14 | Hong Kong | Birthday of the Buddha |
| 1978-05-14 | Hungary | Pentecost |
| 1978-05-14 | Iceland | Pentecost |
| 1978-05-14 | South Korea | Buddha's Birthday |
| 1978-05-14 |  Liberia | National Unification Day |
| 1978-05-14 | Malawi | Kamuzu Day |
| 1978-05-14 | Netherlands | Pentecost |
| 1978-05-14 | Norway | Pentecost |
| 1978-05-14 | Poland | Pentecost |
| 1978-05-14 | Paraguay | Independence Day |
| 1978-05-14 | Sweden | Pentecost |
| 1978-05-14 | Slovenia | Pentecost |
| 1978-05-14 | Svalbard & Jan Mayen | Pentecost |
| 1978-05-14 | Sint Maarten | Pentecost |
| 1978-05-15 | Andorra | Whit Monday |
| 1978-05-15 | Antigua & Barbuda | Whit Monday |
| 1978-05-15 | Anguilla | Whit Monday |
| 1978-05-15 | Austria | Whit Monday |
| 1978-05-15 | Barbados | Whit Monday |
| 1978-05-15 | Belgium | Whit Monday |
| 1978-05-15 | Benin | Whit Monday |
| 1978-05-15 | St. Barths | Whit Monday |
| 1978-05-15 |  Bahamas | Whit Monday |
| 1978-05-15 | Central African Republic | Whit Monday |
| 1978-05-15 | Republic of the Congo | Whit Monday |
| 1978-05-15 | Switzerland | Whit Monday |
| 1978-05-15 | Republic of Côte d'Ivoire | Whit Monday |
| 1978-05-15 | Germany | Whit Monday |
| 1978-05-15 | Denmark | Whit Monday |
| 1978-05-15 | Dominica | Whit Monday |
| 1978-05-15 | Spain | Whit Monday |
| 1978-05-15 | Faroe Islands | Whit Monday |
| 1978-05-15 | France | Whit Monday |
| 1978-05-15 | Gabon | Whit Monday |
| 1978-05-15 | Grenada | Whit Monday |
| 1978-05-15 | French Guiana | Whit Monday |
| 1978-05-15 | Greenland | Whit Monday |
| 1978-05-15 | Guadeloupe | Whit Monday |
| 1978-05-15 | Hong Kong | Birthday of the Buddha |
| 1978-05-15 | Hungary | Whit Monday |
| 1978-05-15 | Iceland | Whit Monday |
| 1978-05-15 | Italia | Whit Monday |
| 1978-05-15 | St. Kitts & Nevis | Whit Monday |
| 1978-05-15 |  Cayman Islands | Discovery Day |
| 1978-05-15 | St. Lucia | Whit Monday |
| 1978-05-15 | Lichtenstein | Whit Monday |
| 1978-05-15 | Luxembourg | Whit Monday |
| 1978-05-15 | Monaco | Whit Monday |
| 1978-05-15 | St. Martin | Whit Monday |
| 1978-05-15 | Madagascar | Whit Monday |
| 1978-05-15 | Martinique | Whit Monday |
| 1978-05-15 | Montserrat | Whit Monday |
| 1978-05-15 | Malawi | Kamuzu Day (substitute day) |
| 1978-05-15 | New Caledonia | Whit Monday |
| 1978-05-15 | Netherlands | Whit Monday |
| 1978-05-15 | Norway | Whit Monday |
| 1978-05-15 | St. Pierre & Miquelon | Whit Monday |
| 1978-05-15 | Paraguay | Independence Day |
| 1978-05-15 | Réunion | Whit Monday |
| 1978-05-15 | St. Helena | Whit Monday |
| 1978-05-15 | Svalbard & Jan Mayen | Whit Monday |
| 1978-05-15 | Senegal | Whit Monday |
| 1978-05-15 | Togolese Republic | Whit Monday |
| 1978-05-15 | St. Vincent & Grenadines | Whit Monday |
| 1978-05-15 |  British Virgin Islands | Whit Monday |
| 1978-05-15 | Mayotte | Whit Monday |
| 1978-05-16 |  South Sudan | SPLA Day |
| 1978-05-17 | Democratic Republic of the Congo | Liberation Day |
| 1978-05-17 | Spain | Día de las Letras Gallegas |
| 1978-05-17 | Norway | Constitution Day |
| 1978-05-17 | Svalbard & Jan Mayen | Constitution Day |
| 1978-05-18 | Haiti | Flag and Universities' Day |
| 1978-05-18 | Somalia | Restoration of Somaliland Sovereignty |
| 1978-05-19 | People's Republic of Bangladesh | Buddha's Birthday |
| 1978-05-19 | Cape Verde | Dia do Município da Praia |
| 1978-05-19 | Turkey | Commemoration of Atatürk, Youth and Sports Day |
| 1978-05-19 | United States of America | Malcolm X Day |
| 1978-05-20 | Cameroon | National Day |
| 1978-05-21 | Chile | Navy Day |
| 1978-05-21 | Montenegro | Independence Day |
| 1978-05-21 | St. Helena | Saint Helena Day |
| 1978-05-22 | Belize | Commonwealth Day, Sovereign's Day |
| 1978-05-22 |  Canada | Victoria Day |
| 1978-05-22 | Canada | National Patriots' Day (QC) |
| 1978-05-22 | France | Abolition of Slavery |
| 1978-05-22 | Montenegro | Independence Day |
| 1978-05-22 | Martinique | Abolition of Slavery |
| 1978-05-22 | Malaysia | Hari Hol of Pahang |
| 1978-05-23 |  Jamaica | Labour Day |
| 1978-05-23 | Montenegro | Independence Day (substitute day) |
| 1978-05-24 | Bulgaria | Bulgarian Education and Culture, and Slavonic Literature Day |
| 1978-05-24 | Ecuador | The Battle of Pichincha |
| 1978-05-24 | Eritrea | Independence Day |
| 1978-05-24 | Macedonia | Saints Cyril and Methodius Day |
| 1978-05-25 | Argentina | Day of the First National Government |
| 1978-05-25 | Austria | Corpus Christi |
| 1978-05-25 | Bosnia and Herzegovina | Corpus Christi |
| 1978-05-25 | Bolivia | Corpus Christi |
| 1978-05-25 | Bolivia | Chuquisaca Day (H) |
| 1978-05-25 | Switzerland | Corpus Christi |
| 1978-05-25 | Germany | Corpus Christi |
| 1978-05-25 | Dominican Republic | Corpus Christi |
| 1978-05-25 | Spain | Corpus Christi |
| 1978-05-25 | Grenada | Corpus Christi |
| 1978-05-25 | The Gambia | Africa Day |
| 1978-05-25 | Guinea | Africa Day |
| 1978-05-25 | Republic of Equatorial Guinea | Corpus Christi |
| 1978-05-25 | Croatia | Corpus Christi |
| 1978-05-25 | Haiti | Corpus Christi |
| 1978-05-25 | St. Lucia | Corpus Christi |
| 1978-05-25 | Lichtenstein | Corpus Christi |
| 1978-05-25 | Lesotho | Africa Day/ Heroes' Day |
| 1978-05-25 | Monaco | Corpus Christi |
| 1978-05-25 | Madagascar | Africa Day |
| 1978-05-25 | Republic of Mali | Jour de l'Afrique |
| 1978-05-25 | Mauritania | Africa Day |
| 1978-05-25 | Namibia | Africa Day |
| 1978-05-25 | Poland | Corpus Christi |
| 1978-05-25 | Portugal | Corpus Christi |
| 1978-05-25 | Seychelles | Corpus Christi |
| 1978-05-25 | San Marino | Corpus Christi |
| 1978-05-25 |  Trinidad & Tobago | Corpus Christi |
| 1978-05-25 | Vatican City | Corpus Christi |
| 1978-05-25 | Zambia | African Freedom Day |
| 1978-05-25 | Zimbabwe | Africa Day |
| 1978-05-25 | Jordan | Independence Day |
| 1978-05-26 | Argentina | Bridge Day |
| 1978-05-26 |  Bermuda | Bermuda Day |
| 1978-05-26 | Georgia | Independence Day |
| 1978-05-26 | Guyana | Independence Day |
| 1978-05-26 | Lichtenstein | Feiertagsbrücke |
| 1978-05-27 | France | Abolition of Slavery (GP) |
| 1978-05-27 | France | abolition of slavery (MF) |
| 1978-05-27 | Guadeloupe | Abolition of Slavery |
| 1978-05-27 | St. Martin | abolition of slavery |
| 1978-05-27 | Nigeria | Children's Day |
| 1978-05-28 | Armenia | Republic Day |
| 1978-05-28 | Azerbaijan | Republic Day |
| 1978-05-28 |  Ethiopia | Derg Downfall Day |
| 1978-05-28 | Venezuela | Natalicio de Jacinto Lara |
| 1978-05-29 |  American Samoa | Memorial Day |
| 1978-05-29 | Australia | Reconciliation Day |
| 1978-05-29 | Azerbaijan | Republic Day (substitute day) |
| 1978-05-29 | Colombia | Corpus Christi |
| 1978-05-29 | United Kingdom | Spring bank holiday |
| 1978-05-29 | Guernsey | Spring bank holiday |
| 1978-05-29 | Gibraltar | Spring bank holiday |
| 1978-05-29 |  Guam | Memorial Day |
| 1978-05-29 | Isle of Man | Spring bank holiday |
| 1978-05-29 | Jersey | Spring bank holiday |
| 1978-05-29 | Nigeria | Democracy Day |
| 1978-05-29 |  Puerto Rico | Memorial Day |
| 1978-05-29 |  Turks & Caicos Islands | National Heroes' Day |
| 1978-05-29 | United States of America | Memorial Day |
| 1978-05-29 |  U.S. Virgin Islands | Memorial Day |
| 1978-05-30 | Anguilla | Anguilla Day |
| 1978-05-30 | Spain | Canary Islands Day |
| 1978-05-30 | Canary Islands | Canary Islands Day |
| 1978-05-30 | Malaysia | Tadau Kaamatan |
| 1978-05-30 | Trinidad & Tobago | Indian Arrival Day |
| 1978-05-31 | Malaysia | Tadau Kaamatan |
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