| Date | Country | Holiday name |
|---|---|---|
| 1964-04-01 |  Cyprus | Cyprus National Day |
| 1964-04-01 |  Iran | Islamic Republic Day |
| 1964-04-01 |  San Marino | Inauguration Ceremony |
| 1964-04-02 |  Argentina | Day of the veterans and the fallen in Malvinas War |
| 1964-04-02 |  Switzerland | Näfelser Fahrt |
| 1964-04-02 | Iran | Sizdah Bedar |
| 1964-04-03 | Argentina | Bridge Day |
| 1964-04-03 |  Guinea | National Holiday |
| 1964-04-04 |  Angola | Peace Day |
| 1964-04-04 |  Senegal | National Holiday |
| 1964-04-04 |  Taiwan | Children's Day |
| 1964-04-05 |  China | Qingming Festival |
| 1964-04-05 |  Hong Kong | Qingming Festival |
| 1964-04-05 | Taiwan | Tomb Sweeping Day |
| 1964-04-06 |  Burundi | Ntaryamira Day |
| 1964-04-06 |  Cocos (Keeling) Islands | Self Determination Day |
| 1964-04-06 | Hong Kong | Qingming Festival |
| 1964-04-06 |  Thailand | Chakri Memorial Day |
| 1964-04-06 | Taiwan | Tomb Sweeping Day (substitute day) |
| 1964-04-07 |  Mozambique | Women’s Day |
| 1964-04-07 |  Rwanda | Genocide Memorial Day |
| 1964-04-07 |  Tanzania | Karume Day |
| 1964-04-09 |  Georgia | National Unity Day |
| 1964-04-09 |  Philippines | Day of Valor |
| 1964-04-09 |  Tunisia | عيد الشهداء |
| 1964-04-09 |  Kosovo | Constitution Day |
| 1964-04-10 |  Liberia | Fast and Prayer Day |
| 1964-04-11 |  Costa Rica | Gesta Heroica de Juan Santamaría |
| 1964-04-13 | Thailand | Songkran Festival |
| 1964-04-14 |  People's Republic of Bangladesh | Bengali New Year's Day |
| 1964-04-14 |  Honduras | Día de las Américas |
| 1964-04-14 | Thailand | Songkran Festival |
| 1964-04-15 |  Bolivia | Tarija Day |
| 1964-04-15 |  Malaysia | Declaration of Malacca City as Historical City |
| 1964-04-15 | Thailand | Songkran Festival |
| 1964-04-16 |  Puerto Rico | Birthday of José de Diego |
| 1964-04-16 |  United States of America | Emancipation Day |
| 1964-04-17 |  American Samoa | American Samoa Flag Day |
| 1964-04-17 |  Gabon | Women's Day |
| 1964-04-18 |  Zimbabwe | Independence Day |
| 1964-04-19 |  Swaziland | Birthday of King Mswati III |
| 1964-04-19 |  Venezuela | Declaration of Independence |
| 1964-04-20 |  St. Helena | Queen's Birthday |
| 1964-04-20 | Swaziland | Birthday of King Mswati III (substitute day) |
| 1964-04-20 | United States of America | Patriots' Day |
| 1964-04-21 |  Brazil | Tiradentes' Day |
| 1964-04-21 | Brazil | Fundação de Brasília (DF) |
| 1964-04-21 | Brazil | Data magna do estado (MG) |
| 1964-04-21 |  Vietnam | Hung Kings Commemorations |
| 1964-04-21 |  Jordan | Arafat Day (estimated) |
| 1964-04-21 |  Kuwait | Arafat Day (estimated) |
| 1964-04-21 |  Saudi Arabia | Arafat Day (estimated) |
| 1964-04-22 | Jordan | Eid al-Adha (estimated) |
| 1964-04-22 | Kuwait | Eid al-Adha (estimated) |
| 1964-04-22 | Saudi Arabia | Eid al-Adha Holiday (estimated) |
| 1964-04-23 |  Spain | Día de Aragón (AR) |
| 1964-04-23 | Spain | Fiesta de Castilla y León (CL) |
| 1964-04-23 |  Iceland | First Day of Summer |
| 1964-04-23 |  Turkey | National Sovereignty and Children's Day |
| 1964-04-23 | Jordan | Eid al-Adha Holiday (estimated) |
| 1964-04-23 | Kuwait | Eid al-Adha Holiday (estimated) |
| 1964-04-23 | Saudi Arabia | Eid al-Adha Holiday (estimated) |
| 1964-04-24 |  Armenia | Mother's Day |
| 1964-04-24 |  Denmark | Prayer Day |
| 1964-04-24 |  Faroe Islands | Flag Day |
| 1964-04-24 | Faroe Islands | Great Prayer Day |
| 1964-04-24 |  Greenland | Prayer Day |
| 1964-04-24 |  Republic of the Niger | Concord Day |
| 1964-04-24 | United States of America | Arbor Day |
| 1964-04-24 | Jordan | Eid al-Adha Holiday (estimated) |
| 1964-04-24 | Kuwait | Eid al-Adha Holiday (estimated) |
| 1964-04-24 | Saudi Arabia | Eid al-Adha Holiday (estimated) |
| 1964-04-25 |  Australia | Anzac Day |
| 1964-04-25 | Cocos (Keeling) Islands | Anzac Day |
| 1964-04-25 |  Cook Islands | Anzac Day |
| 1964-04-25 |  Christmas Island | Anzac Day |
| 1964-04-25 |  Egypt | Sinai Liberation Day |
| 1964-04-25 |  Italia | Liberation Day |
| 1964-04-25 |  New Zealand | ANZAC Day |
| 1964-04-25 |  Portugal | Liberty Day |
| 1964-04-25 | Swaziland | National Flag Day |
| 1964-04-25 |  Tonga | ANZAC Day |
| 1964-04-25 | Saudi Arabia | Eid al-Adha Holiday (observed, estimated) |
| 1964-04-26 | Malaysia | Sultan of Terengganu's Birthday |
| 1964-04-26 | Tanzania | Union Day |
| 1964-04-26 | Saudi Arabia | Eid al-Adha Holiday (observed, estimated) |
| 1964-04-27 | Australia | Anzac Day (substitute day) |
| 1964-04-27 |  Aruba | Kings Day |
| 1964-04-27 |  Caribbean Netherlands | Kings Day |
| 1964-04-27 |  Curaçao | Kings Day |
| 1964-04-27 |  France | Abolition of Slavery |
| 1964-04-27 | New Zealand | ANZAC Day (substitute day) |
| 1964-04-27 |  Slovenia | Day of Uprising Against Occupation |
| 1964-04-27 |  Sierra Leone | Independence Day |
| 1964-04-27 |  Sint Maarten | King's Day |
| 1964-04-27 | Swaziland | National Flag Day (substitute day) |
| 1964-04-27 |  Togolese Republic | Independence Day |
| 1964-04-27 | United States of America | Confederate Memorial Day |
| 1964-04-27 |  Mayotte | Abolition of Slavery |
| 1964-04-27 |  South Africa | Freedom Day |
| 1964-04-28 |  Barbados | National Heroes Day |
| 1964-04-28 |  Gibraltar | Workers Memorial Day |
| 1964-04-29 |  Japan | Emperor's Birthday |
| 1964-04-30 | Caribbean Netherlands | Rincon Day |
| 1964-04-30 |  Netherlands | Queen's Day |
| 1964-04-30 | Sint Maarten | Carnival |
| 1964-04-30 | Vietnam | Day of liberating the South for national reunification |
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