April 1, 1951
- Cyprus
- Cyprus National Day
- San Marino
- Inauguration Ceremony
April 2, 1951
- Argentina
- Day of the veterans and the fallen in Malvinas War
- Iran
- Islamic Republic Day
- New Zealand
- Provincial anniversary day
April 5, 1951
- Switzerland
- Näfelser Fahrt
- China
- Qingming Festival
- Hong Kong
- Qingming Festival
- Taiwan
- Tomb Sweeping Day
April 6, 1951
- Burundi
- Ntaryamira Day
- Cocos (Keeling) Islands
- Self Determination Day
- Thailand
- Chakri Memorial Day
April 7, 1951
- Mozambique
- Women’s Day
- Rwanda
- Genocide Memorial Day
- Tanzania
- Karume Day
April 9, 1951
- Georgia
- National Unity Day
- Philippines
- Day of Valor
- Tunisia
- عيد الشهداء
- Kosovo
- Constitution Day
April 11, 1951
- Costa Rica
- Gesta Heroica de Juan Santamaría
April 14, 1951
- People's Republic of Bangladesh
- Bengali New Year's Day
- Honduras
- Día de las Américas
- Thailand
- Songkran Festival
April 16, 1951
- Bolivia
- Tarija Day (substitutes)
- Puerto Rico
- Birthday of José de Diego
- St. Helena
- Queen's Birthday
- United States of America
- Emancipation Day (DC)
- Patriots' Day (MA)
April 17, 1951
- American Samoa
- American Samoa Flag Day
- Gabon
- Women's Day
April 18, 1951
- Zimbabwe
- Independence Day
April 20, 1951
- Denmark
- Prayer Day
- Faroe Islands
- Great Prayer Day
- Greenland
- Prayer Day
April 21, 1951
- Brazil
- Tiradentes' Day
- Fundação de Brasília (DF)
- Data magna do estado (MG)
April 23, 1951
- Spain
- Día de Aragón (AR)
- Fiesta de Castilla y León (CL)
- Turkey
- National Sovereignty and Children's Day
- United States of America
- Confederate Memorial Day
April 24, 1951
- Armenia
- Mother's Day
- Faroe Islands
- Flag Day
- Republic of the Niger
- Concord Day
April 25, 1951
- Australia
- Anzac Day
- Cocos (Keeling) Islands
- Anzac Day
- Cook Islands
- Anzac Day
- Christmas Island
- Anzac Day
- Egypt
- Sinai Liberation Day
- Italia
- Liberation Day
- New Zealand
- ANZAC Day
- Portugal
- Liberty Day
- Swaziland
- National Flag Day
- Tonga
- ANZAC Day
April 27, 1951
- Aruba
- Kings Day
- Bulgaria
- Good Friday
- Caribbean Netherlands
- Kings Day
- Curaçao
- Kings Day
- Cyprus
- Good Friday
- Eritrea
- Orthodox Good Friday
- Ethiopia
- Good Friday
- France
- Abolition of Slavery
- Georgia
- Good Friday
- Greece
- Good Friday
- Montenegro
- Good Friday
- Romania
- Good Friday
- Serbia
- Orthodox Good Friday
- Slovenia
- Day of Uprising Against Occupation
- Sierra Leone
- Independence Day
- Sint Maarten
- King's Day
- Togolese Republic
- Independence Day
- United States of America
- Arbor Day
- Mayotte
- Abolition of Slavery
- South Africa
- Freedom Day
April 29, 1951
- Albania
- Orthodox Easter
- Bosnia and Herzegovina
- Orthodox Easter
- Bulgaria
- Easter Sunday
- Cyprus
- Easter Sunday
- Eritrea
- Orthodox Easter
- Ethiopia
- Easter Sunday
- Georgia
- Easter Sunday
- Greece
- Easter Sunday
- Japan
- Emperor's Birthday
- Moldova
- Easter Sunday
- Montenegro
- Easter Sunday
- Macedonia
- Orthodox Easter
- Romania
- Easter Sunday
- Serbia
- Orthodox Easter
- Sudan
- Coptic Easter
- Ukraine
- Orthodox Easter
- Kosovo
- Orthodox Easter
April 30, 1951
- Albania
- Orthodox Easter
- Argentina
- Bridge Day
- Bulgaria
- Easter Monday
- Caribbean Netherlands
- Rincon Day
- Cyprus
- Easter Monday
- Dominican Republic
- Labour Day
- Egypt
- Sham El Nessim
- Georgia
- Easter Monday
- Greece
- Easter Monday
- Moldova
- Easter Monday
- Macedonia
- Orthodox Easter Monday
- Netherlands
- Queen's Day
- Romania
- Easter Monday
- Serbia
- Orthodox Easter Monday
- Sint Maarten
- Carnival
- Ukraine
- Orthodox Easter
- United States of America
- Confederate Memorial Day
- Vietnam
- Day of liberating the South for national reunification
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