April 1, 1975
- Cyprus
- Cyprus National Day
- Iran
- Islamic Republic Day
- New Zealand
- Provincial anniversary day
- San Marino
- Inauguration Ceremony
April 3, 1975
- Switzerland
- Näfelser Fahrt
- Guinea
- National Holiday
April 6, 1975
- Burundi
- Ntaryamira Day
- Cocos (Keeling) Islands
- Self Determination Day
- Thailand
- Chakri Memorial Day
April 7, 1975
- Mozambique
- Women’s Day
- Rwanda
- Genocide Memorial Day
- Tanzania
- Karume Day
April 9, 1975
- Georgia
- National Unity Day
- Philippines
- Day of Valor
- Tunisia
- عيد الشهداء
- Kosovo
- Constitution Day
April 11, 1975
- Costa Rica
- Gesta Heroica de Juan Santamaría
- Liberia
- Fast and Prayer Day
April 13, 1975
- Thailand
- Songkran Festival
April 14, 1975
- People's Republic of Bangladesh
- Bengali New Year's Day
- Honduras
- Día de las Américas
- Thailand
- Songkran Festival
April 16, 1975
- Puerto Rico
- Birthday of José de Diego
- United States of America
- Emancipation Day
- Israel
- Independence Day (Yom HaAtzmaut)
April 17, 1975
- American Samoa
- American Samoa Flag Day
- Gabon
- Women's Day
April 18, 1975
- Zimbabwe
- Independence Day
April 20, 1975
- Vietnam
- Hung Kings Commemorations
April 21, 1975
- Brazil
- Tiradentes' Day
- Fundação de Brasília (DF)
- Data magna do estado (MG)
- St. Helena
- Queen's Birthday
- Swaziland
- Birthday of King Mswati III (substitute day)
- United States of America
- Patriots' Day (MA)
April 24, 1975
- Armenia
- Mother's Day
- Faroe Islands
- Flag Day
- Iceland
- First Day of Summer
- Republic of the Niger
- Concord Day
April 25, 1975
- Australia
- Anzac Day
- Cocos (Keeling) Islands
- Anzac Day
- Cook Islands
- Anzac Day
- Christmas Island
- Anzac Day
- Denmark
- Prayer Day
- Egypt
- Sinai Liberation Day
- Faroe Islands
- Great Prayer Day
- Greenland
- Prayer Day
- Italia
- Liberation Day
- New Zealand
- ANZAC Day
- Portugal
- Liberty Day
- Swaziland
- National Flag Day
- Tonga
- ANZAC Day
- United States of America
- Arbor Day
April 27, 1975
- Aruba
- Kings Day
- Caribbean Netherlands
- Kings Day
- Curaçao
- Kings Day
- France
- Abolition of Slavery
- Slovenia
- Day of Uprising Against Occupation
- Sierra Leone
- Independence Day
- Sint Maarten
- King's Day
- Togolese Republic
- Independence Day
- Mayotte
- Abolition of Slavery
- South Africa
- Freedom Day
April 28, 1975
- Barbados
- National Heroes Day
- Gibraltar
- Workers Memorial Day
- Sierra Leone
- Independence Day (substitute day)
- United States of America
- Confederate Memorial Day
- South Africa
- Public Holiday
April 29, 1975
- Japan
- Emperor's Birthday
April 30, 1975
- Caribbean Netherlands
- Rincon Day
- Netherlands
- Queen's Day
- Sint Maarten
- Carnival
- Vietnam
- Day of liberating the South for national reunification
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