June 4, 1978
- Iran
- Imam Khomeini's Demise
June 5, 1978
- Australia
- Western Australia Day
- Cook Islands
- Queen's Birthday
- Colombia
- Sacred Heart
- Republic of Equatorial Guinea
- President's Day
- Ireland
- First Monday in June
- Iran
- Revolt of Khordad 15
- Malaysia
- Yang di-Pertuan Agong's Birthday
- New Zealand
- Queen's Birthday
- Tonga
- Emancipation Day
- United States of America
- Jefferson Davis' birthday
- Faroe Islands
- Constitution Day
June 6, 1978
- South Korea
- Memorial Day
- Sweden
- National Day
June 9, 1978
- Åland Islands
- Autonomy Day
- Western Sahara
- Day of the Martyrs
- Isle of Man
- Tourist Trophy, Senior Race Day
- Uganda
- National Heroes Day
June 10, 1978
- Republic of the Congo
- Fête de la commémoration de la conférence nationale souveraine
- China
- Dragon Boat Festival
- France
- Abolition of Slavery
- French Guiana
- Abolition of Slavery
- Hong Kong
- Dragon Boat Festival
- Portugal
- Portugal Day
- Taiwan
- Dragon Boat Festival
- British Virgin Islands
- Sovereign’s Birthday
June 11, 1978
- United States of America
- Kamehameha Day
- Israel
- Shavuot (Feast of Weeks)
June 12, 1978
- Anguilla
- Celebration of the Birthday of Her Majesty the Queen
- Australia
- Queen's Birthday
- Montserrat
- Queen's Birthday Celebration
- Nigeria
- M.K.O Abiola Day
- Philippines
- Independence Day
- Paraguay
- Chaco Armistice
- Russia
- Russia Day
- Turks & Caicos Islands
- Queen's Birthday
- United States of America
- Kamehameha Day (substitute day)
- Papua New Guinea
- Queen Elizabeth II's Birthday
June 14, 1978
- United States of America
- Flag Day
June 15, 1978
- Azerbaijan
- National Salvation Day
- Brazil
- Aniversário do estado
June 16, 1978
- South Africa
- Youth Day
June 17, 1978
- Western Sahara
- Day of National Unity
- Iceland
- Icelandic National Day
- United States of America
- Bunker Hill Day
June 20, 1978
- Argentina
- National Flag Day
- Eritrea
- Martyrs' Day
- United States of America
- West Virginia Day
June 21, 1978
- Bolivia
- Andean Amazonian Chaqueño New Year
- Canada
- National Indigenous Peoples Day
- Greenland
- National Day
- Togolese Republic
- Day of the Martyrs
- Papua New Guinea
- June Solstice
June 22, 1978
- Croatia
- Anti-Fascist Struggle Day
June 23, 1978
- Switzerland
- Jura Plebiscite
- Estonia
- Victory Day
- Luxembourg
- National Holiday
- Latvia
- Midsummer Eve
June 25, 1978
- Croatia
- Statehood Day
- Mozambique
- Independence Day
June 26, 1978
- Azerbaijan
- Azerbaijan Armed Forces Day
- Chile
- Saints Peter and Paul
- Madagascar
- Independence Day
- Mozambique
- Public Holiday
- Somalia
- Independence of British Somaliland
June 27, 1978
- Djibouti
- Independence Day
June 29, 1978
- Switzerland
- Saints Peter and Paul
- Malta
- Saints Peter and Paul
- Peru
- Saints Peter and Paul
- Seychelles
- Independence Day
- Vatican City
- Saints Peter and Paul
June 30, 1978
- Democratic Republic of the Congo
- Independence Day
- Central African Republic
- General Prayer Day
- Egypt
- 30 June Day
- Guatemala
- Army Day
- British Virgin Islands
- Virgin Islands Day
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