Editing April (section)

=== Fixed ===
[[File:Celebrazione del 2777 Natale di Roma - Pietas Comunità Gentile 2.jpg|thumb|Celebration of the 2777th [[Natale di Roma]] at the [[Circus Maximus]]]]
* [[April 1]]
** [[April Fools' Day]]
** [[Arbor Day#Tanzania|Arbor Day]] ([[Tanzania]])
** [[Civil Service Day]] ([[Thailand]])
** [[Public holidays in Cyprus|Cyprus National Day]] ([[Cyprus]])
** [[Edible Book Day]]
** [[Fossil Fools Day]]
** [[Kha b-Nisan]] ([[Assyrian people]])
** [[National Science Day (Thailand)|National Civil Service Day]] ([[Thailand]])
** [[Odisha Day]] ([[Odisha]], India)
** Start of [[National Prostate Health Month#Related observances|Testicular Cancer Awareness week]] ([[United States]]), April 1–7
** [[Season for Nonviolence]] January 30 – April 4
* [[April 2]]
** [[International Children's Book Day]] ([[International observance]])
** [[Malvinas Day]] ([[Argentina]])
** [[List of food days#April|National Peanut Butter and Jelly Day]] ([[United States]])
** [[Thai Heritage Conservation Day]] ([[Thailand]])
** [[Unity of Peoples of Russia and Belarus Day]] ([[Belarus]])
** [[World Autism Awareness Day]] ([[International observance]])
* [[April 3]]
* [[April 4]]
** [[Children's Day]] ([[Hong Kong]], [[Taiwan]])
** [[Independence Day (Senegal)]]
** [[International observance#April|International Day for Mine Awareness and Assistance in Mine Action]]
** [[Peace Day (Angola)]]
* [[April 5]]
** [[Children's Day]] ([[Palestinian territories]])
** [[List of food days#April|National Caramel Day]] (United States)
** [[Sikmogil]] (South Korea)
* [[April 6]]
** [[Public holidays in Thailand|Chakri Day]] (Thailand)
** [[National Beer Day (United Kingdom)]]
** [[New Beer's Eve]] (United States)
** [[Tartan Day]] (United States & Canada)
* [[April 7]]
** [[Flag Day]] (Slovenia)
** [[Genocide Memorial Day (Rwanda)]], and its related observance:
*** [[International Day of Reflection on the 1994 Rwanda Genocide]] ([[United Nations]])
** [[Motherhood and Beauty Day]] (Armenia)
** [[National Beer Day (United States)]]
** [[Sheikh Abeid Amani Karume Day]] (Tanzania)
** [[Public holidays in Mozambique|Women's Day]] (Mozambique)
** [[World Health Day]] ([[International observance]])
* [[April 8]]
** [[Buddha's Birthday]] (Japan only, other countries follow different calendars)
** [[Feast of the Third Day of the Writing of the Book of the Law|Feast of the First Day of the Writing of the Book of the Law]] ([[Thelema]])
** [[International Romani Day]] ([[International observance]])
* [[April 9]]
** [[Anniversary of the German Invasion of Denmark]] (Denmark)
** [[Baghdad Liberation Day]] ([[Iraqi Kurdistan]])
** [[Constitution Day (Kosovo)]]
** [[Day of National Unity (Georgia)]]
** [[Day of the Finnish Language]] (Finland)
** [[Day of Valor]] or ''Araw ng Kagitingan'' (Philippines)
** [[Feast of the Second Day of the Writing of the Book of the Law]] ([[Thelema]])
** [[List of food days#Global or international|International Banshtai Tsai Day]]
** [[Martyr's Day (Tunisia)]]
** [[National Former Prisoner of War Recognition Day]] (United States)
** [[Ásatrú holidays#The Troth|Remembrance for Haakon Sigurdsson]] ([[The Troth]])
** [[Vimy Ridge Day]] (Canada)
* [[April 10]]
** [[Day of the Builder]] (Azerbaijan)
** [[Feast of the Third Day of the Writing of the Book of the Law]] ([[Thelema]])
** [[Siblings Day]] ([[International observance]])
* [[April 11]]
** [[Juan Santamaría Day]], anniversary of his death in the [[Second Battle of Rivas]]. (Costa Rica)
** [[International Louie Louie Day]]
** [[List of food days#April|National Cheese Fondue Day]] (United States)
** [[World Parkinson's Day]]
* [[April 12]]
** [[Children's Day]] (Bolivia and Haiti)
** Commemoration of first human in space by [[Yuri Gagarin]]:
*** [[Cosmonautics Day]] (Russia)
*** [[International Day of Human Space Flight]]
*** [[Yuri's Night]] ([[International observance]])
** [[Halifax Day]] ([[North Carolina]])
** [[List of food days#April|National Grilled Cheese Sandwich Day]] (United States)
** [[National Redemption Day]] (Liberia)
* [[April 13]]
** [[Jefferson's Birthday]] (United States)
** [[Coma Patients' Day|Katyn Memorial Day]] ([[Poland]])
** [[Teachers' Day#Dates by country/region|Teachers' Day]] ([[Ecuador]])
** First day of [[Thingyan]] ([[Myanmar]]) (April 13–16)
** [[Remembrance days in Slovakia|Unfairly Prosecuted Persons Day]] ([[Slovakia]])
* [[April 14]]
** [[Okinawan festivals and observances|ʔabusibaree]] ([[Okinawa Islands]], Japan)
** [[B. R. Ambedkar|Ambedkar Jayanti]] (India)
** [[Black Day (South Korea)]]
** [[Commemoration of Anfal Genocide Against the Kurds]] ([[Iraqi Kurdistan]])
** [[Dhivehi Language Day]] (Maldives)
** [[Day of Mologa]] ([[Yaroslavl Oblast]], Russia)
** [[Day of the Georgian language]] ([[Georgia (country)]])
** [[Emancipation Day|Season of Emancipation]] (April 14 to August 23) (Barbados)
** [[N'Ko Alphabet Day]] ([[Mande languages|Mande speakers]])
** [[Pohela Boishakh]] (Bangladesh)
** [[Pana Sankranti]] ([[Odisha]], India)
** [[Puthandu]] ([[Tamils]]) (India, Malaysia, Singapore, Sri Lanka)
** Second day of [[Songkran (Thailand)|Songkran]] (Thailand)
** [[Pan American Day]] (several countries in the Americas)
** The first day of [[Takayama Festival|Takayama Spring Festival]] ([[Takayama, Gifu]], Japan)
** [[Vaisakh]] ([[Punjab (region)|Punjab]]), (India and Pakistan)
** [[Youth Day (Angola)]]
* [[April 15]]
** [[Day of the Sun]] (North Korea).<ref name="SeolSongAh2015">{{Cite web|url=http://www.dailynk.com/english/read.php?cataId=nk01500&num=13620|title=Kim Jong Un's birthday still not a holiday|author=Seol Song Ah|date=7 December 2015|access-date=13 January 2017|work=Daily NK|archive-date=January 7, 2018|archive-url=https://web.archive.org/web/20180107010642/http://www.dailynk.com/english/read.php?cataId=nk01500&num=13620|url-status=live}}</ref>
** [[Hillsborough disaster#Memorials|Hillsborough Disaster Memorial]] ([[Liverpool]], England)
** [[Jackie Robinson Day]] (United States)
** [[Pohela Boishakh]] ([[West Bengal]], India) (Note: celebrated on [[April 14]] in Bangladesh)
** Last day of [[Songkran (Thailand)|Songkran]] (Thailand)
** [[Tax Day]], the official deadline for filing an individual [[Tax return (United States)|tax return]] (or requesting an extension). (United States, Philippines)
** [[Universal Day of Culture]]
** [[World Art Day]]
* [[April 16]]
** [[Birthday of José de Diego]] (Puerto Rico, United States)
** [[Birthday of Queen Margrethe II]] (Denmark)
** [[Emancipation Day]] ([[Washington, D.C.]], United States)
** [[Foursquare Day]] ([[International observance]])
** [[Memorial Day for the Victims of the Holocaust]] (Hungary)
** [[List of awareness days#April|National Healthcare Decisions Day]] (United States)
** [[Remembrance of Chemical Attack on Balisan and Sheikh Wasan]] ([[Iraqi Kurdistan]])
** [[World Voice Day]]
* [[April 17]]
** [[Evacuation Day (Syria)]]
** [[FAO Day]] (Iraq)
** [[Flag Day (American Samoa)]]
** [[Malbec World Day]]
** [[List of food days#April|National Cheeseball Day]] (United States)
** [[List of food days#Italy|National Espresso Day]] (Italy)
** [[Public holidays in Gabon|Women's Day]] (Gabon)
** [[World Hemophilia Day]]
* [[April 18]]
** [[Anniversary of the Victory over the Teutonic Knights in the Battle of the Ice, 1242]] (Russia)
** [[Army Day (Iran)]]
** [[Coma Patients' Day]] (Poland)
** [[Día del Amigo|Friend's Day]] (Brazil)
** [[Independence Day (Zimbabwe)]]
** [[International Day For Monuments and Sites]]
** [[Invention Day]] (Japan)
* [[April 19]]
** [[Army Day (Brazil)]]
** [[Beginning of the Independence Movement]] (Venezuela)
** [[History of lysergic acid diethylamide#"Bicycle Day"|Bicycle Day]]
** [[Dutch-American Friendship Day]] (United States)
** [[Holocaust Remembrance Day]] (Poland)
** [[Indigenous Peoples Day (Brazil)|Indigenous Peoples Day]] (Brazil)
** [[King Mswati III's birthday]] (Eswatini)
** [[Landing of the 33 Patriots Day]] (Uruguay)
** [[List of food days#April|National Garlic Day]] (United States)
** [[List of food days#April|National Rice Ball Day]] (United States)
** [[Primrose Day]] (United Kingdom)
* [[April 20]]
** [[420 (cannabis culture)]] (International)
** [[UN Chinese Language Day]] ([[United Nations]])
* [[April 21]]
** [[Natale di Roma]](Italy)
** [[Muster (Texas A&M University)#A. and M. Day|A&M Day]] ([[Texas A&M University]])
** [[Civil Services of India#Civil Services Day|Civil Service Day]] (India)
** [[Public holidays in Russia#Regional public holidays|Day of Local Self-Government]] (Russia)
** [[Grounation Day]] ([[Rastafari movement]])
** [[Public holidays in Mexico#Civic holidays|Heroic Defense of Veracruz]] (Mexico)
** [[Public holidays in North Korea|Kang Pan-sok's Birthday]] (North Korea)
** [[Kartini Day]] (Indonesia)
** [[Public holidays in Russia|Local Self Government Day]] (Russia)
** [[Arbor Day#Kenya|National Tree Planting Day]] (Kenya)
** [[San Jacinto Day]] ([[Texas]])
** [[Queen's Official Birthday#Other countries and territories|Queen's Official Birthday]] ([[Falkland Islands]])
** [[Public holidays in Brazil|Tiradentes' Day]] (Brazil)
** [[Vietnam Book Day]] (Vietnam)
* [[April 22]]
** [[Discovery Day]] (Brazil)
** [[Earth Day]] ([[International observance]]) and its related observance:
*** [[International Mother Earth Day]]
** [[Holocaust Memorial Days|Holocaust Remembrance Day]] (Serbia)
** [[List of food days#April|National Jelly Bean Day]] (United States)
* [[April 23]]
** [[Castile and León Day]] ([[Castile and León]], Spain)
** [[German Apples Day|German Beer Day]] (Germany)
** [[Conch Republic|Independence Day]] ([[Conch Republic]], [[Key West, Florida]])
** [[International Pixel-Stained Technopeasant Day]]
** [[Khongjom Day]] ([[Manipur]], India)
** [[National Sovereignty and Children's Day]] (Turkey and Northern Cyprus)
** [[Navy Day (China)]]
** [[St George's Day]] (England) and its related observances:
*** [[Canada Book Day]] (Canada)
*** [[St George's Day#Catalonia|La Diada de Sant Jordi]] ([[Catalonia]], Spain)
*** [[World Book Day]]
** [[UN English Language Day]] ([[United Nations]])
* [[April 24]]
** [[Armenian Genocide Remembrance Day]] (Armenia)
** [[Concord Day]] (Niger)
** [[Children's Day (Zambia)]]
** [[Democracy Day (Nepal)]]
** [[Fashion Revolution Day]]
** [[Flag Day (Ireland)]]
** [[International Sculpture Day]]
** [[Kapyong Day]] (Australia)
** [[Labour Day#Bangladesh|Labour Safety Day]] (Bangladesh)
** [[National Panchayati Raj Day]] (India)
** [[List of food days#April|National Pigs in a Blanket Day]] (United States)
** [[Republic Day (The Gambia)]]
** [[St Mark's Eve]] ([[Western Christianity]])
** [[World Day for Laboratory Animals]]
* [[April 25]]
** [[Anniversary of the First Cabinet of Kurdish Government]] ([[Iraqi Kurdistan]])
** [[Anzac Day]] (Australia, New Zealand)
** [[Arbor Day (Germany)]]
** [[DNA Day]]
** [[Feast of Saint Mark]] ([[Western Christianity]])
** [[Flag Day (Faroe Islands)]]
** [[Public holidays in Eswatini|Flag Day (Eswatini)]]
** [[Freedom Day (Portugal)]]
** [[Liberation Day (Italy)]]
** [[Rogation Day|Major Rogation]] ([[Western Christianity]])
** [[Military Foundation Day]] (North Korea)<ref name="SeolSongAh2015"/>
** [[List of food days#April|National Zucchini Bread Day]] (United States)
** [[Parental Alienation Awareness Day]]
** [[Red Hat Society Day]]
** [[Sinai Liberation Day]] (Egypt)
** [[World Malaria Day]]
* [[April 26]]
** [[Chernobyl disaster]] related observances:
*** [[International Duties Memorial Day|Memorial Day of Radiation Accidents and Catastrophes]] (Russia)
*** [[Day of Remembrance of the Chernobyl tragedy]] (Belarus)
** [[Confederate Memorial Day]] ([[Florida]], United States)
** [[Hug A Friend Day]]
** [[Lesbian Visibility Day]]
** [[List of food days#April|National Pretzel Day]] (United States)
** [[Old Permic alphabet|Old Permic Alphabet Day]]
** [[Union Day (Tanzania)]]
** [[World Intellectual Property Day]]
* [[April 27]]
** [[Public holidays in Russia|Day of Russian Parliamentarism]] (Russia)
** [[Day of the Uprising Against the Occupying Forces]] (Slovenia)
** [[Flag Day]] (Moldova)
** [[Freedom Day (South Africa)]]
*** [[UnFreedom Day]]
** [[Independence Day (Sierra Leone)]]
** [[Public holidays in Togo|Independence Day (Togo)]]
** [[National Day]] ([[Mayotte]])
** [[National Day]] (Sierra Leone)
** [[List of food days#April|National Prime Rib Day]] (United States)
** [[Flag flying days in Finland|National Veterans' Day]] (Finland)
* [[April 28]]
** [[Lawyers' Day]] ([[Orissa, India]])
** [[Mujahideen Victory Day]] (Afghanistan)
** [[National Day]] ([[Sardinia]], Italy)
** [[National Heroes Day (Barbados)|National Heroes Day]] (Barbados)
** [[Restoration of Sovereignty Day]] (Japan)
** [[Workers' Memorial Day|Workers' Memorial Day and World Day for Safety and Health at Work]] ([[International observances|international]])
*** [[National Day of Mourning (Canada)|National Day of Mourning]] (Canada)
* [[April 29]]
** [[Day of Remembrance for all Victims of Chemical Warfare]] ([[United Nations]])
** [[International Dance Day]] ([[UNESCO]])
** [[Public holidays in Denmark#Other special days|Princess Bedike's Birthday]] (Denmark)
** [[List of food days#April|National Shrimp Scampi Day]] (United States)
** [[Shōwa Day]], traditionally the start of the [[Golden Week (Japan)|Golden Week]] holiday period, which is April 29 and May 3–5. (Japan)
* [[April 30]]
** [[Armed Forces Day]] ([[Georgia (country)]])
** [[Flag flying days in Sweden|Birthday of the King]] (Sweden)
** [[Battle of Camarón|Camarón Day]] ([[French Foreign Legion]])
** [[Children's Day]] (Mexico)
** [[Public holidays in Thailand|Consumer Protection Day]] (Thailand)
** [[Honesty Day]] (United States)
** [[International Jazz Day]] ([[UNESCO]])
** [[Martyrs' Day (Pakistan)|Martyrs' Day]] (Pakistan)
** [[May Eve]], the eve of the first day of summer in the Northern hemisphere ''(see [[May 1]])'':
*** [[Beltane]] begins at sunset in the Northern hemisphere, [[Samhain]] begins at sunset in the Southern hemisphere. ([[Neo-Druidism|Neo-Druidic]] [[Wheel of the Year]])
*** [[Carodejnice]] (Czech Republic and Slovakia)
*** [[Walpurgis Night]] (Central and Northern Europe)
** [[Persian Gulf naming dispute#National Persian Gulf Day|National Persian Gulf Day]] (Iran)
** [[Reunification Day]] (Vietnam)
** [[Public holidays in Russia#Popular holidays which are not public holidays|Russian State Fire Service Day]] (Russia)
** [[Tax return (Canada)|Tax Day (Canada)]]
** [[Teachers' Day]] (Paraguay)