May
na onwa May bu ubochi nke ise na afo na kalenda Julian na Gregorian bu nke ato n'ime onwa asaa nwere ogologo ubochi 31.

Mee bụ ọnwa nke mmiri n'Ebe Ugwu Ụwa, na ụbịa n'ebe ndịda Hemisphere.  Ya mere, May na Southern Hemisphere bụ oge nke ọnwa Nọvemba na Northern Hemisphere na vice versa.  Mbubreyo May na-abụkarị mmalite nke oge ezumike ọkọchị na United States (Ụbọchị Ncheta) na Canada (Ụbọchị Victoria) na-agwụ n'ụbọchị ọrụ, Mọnde mbụ nke Septemba.

Akpọrọ May (na Latin, Maius) aha maka chi nwanyị Gris Maia, bụ onye e ji mara chi nwanyị ọmụmụ nke oge Rome, Bona Dea, onye ememe ya mere na May.  N’aka nke ọzọ, onye Rom na-ede uri bụ Ovid na-enye usoro ọmụmụ nke abụọ, bụ́ nke o kwuru na a na-akpọ ọnwa May maka ndị maiores, Latịn maka “ndị okenye,” nakwa na a kpọrọ ọnwa na-abịa (June) aha maka iuniores, ma ọ bụ “ndị na-eto eto.  (Fasti VI.88).

Ememe ndị Rom oge ochie 
N'okpuru kalenda nke Rom oge ochie, emume Bona Dea dara na May 1, Argei dara na May 14 ma ọ bụ May 15, Agonalia dara na May 21, na Ambarvalia na May 29. E mere Floralia n'April 27 n'oge Republican, ma ọ bụ April 28 na kalenda Julian, ma dịgide ruo May 3. Lemuria (ememe) dara na 9,11, na 13 Mee n'okpuru kalenda Julian. Kọleji nke Aesculapius na Hygia mere emume abụọ nke Rosalia (emume), otu na Mee 11 na otu na Mee 22.

 April 29 to May 5 in Japan, which includes four different holidays, is called "Golden Week". Many workers have up to 10 days off. There is also 'May sickness', where new students or workers start to be tired of their new routine. (In Japan the school year and fiscal year start on April 1.)
 Mayovka, in the context of the late Russian Empire, was a picnic in the countryside or in a park in the early days of May, hence the name. Eventually, "mayovka" (specifically, "proletarian mayovka") came to mean an illegal celebration of May 1 by revolutionary public, typically presented as an innocent picnic.
 May 1
 Armed Forces Day (Mauritania)
 Beltane (Ireland, Neopaganism)
 Constitution Day (Argentina)
 Lei Day (Hawaii, United States)
 May Day (International observance)
 May 2
 Anniversary of the Dos de Mayo Uprising (Community of Madrid, Spain)
 Birth Anniversary of Third Druk Gyalpo (Bhutan)
 Flag Day (Poland)
 Indonesia National Education Day
 May 3
 Constitution Day  (Poland)
 Constitution Memorial Day (Japan)
 Roodmas
 Sun Day (ternational)
 World Press Freedom Day
 May 4
 Anti-Bullying Day (United Nations)
 Bird Day (United States)
 Cassinga Day (Namibia)
 Death of Milan Rastislav Štefánik Day (Slovakia)
 Greenery Day (Japan)
 International Firefighters' Day
 May Fourth Movement commemorations:
 Literary Day (Taiwan)
 Youth Day (China)
 Remembrance Day for Martyrs and Disabled (Afghanistan)
 Remembrance of the Dead (Netherlands)
 Restoration of Independence day (Latvia)
 Star Wars Day (International observance)
 World Give Day
 Youth Day (Fiji)
 May 5
 Children's Day (Japan, Korea)
 Cinco de Mayo
 Constitution Day (Kyrgyzstan)
 Coronation Day (Thailand)
 Europe Day in Europe (uncommon usage, largely replaced by May 9).
 Feast of al-Khadr or Saint George (Palestinian people)
 Indian Arrival Day (Guyana)
 International Midwives' Day
 Liberation Day (Denmark)
 Liberation Day (Netherlands)
 Lusophone Culture Day (Community of Portuguese Language Countries)
 Martyrs' Day (Albania)
 Patriots' Victory Day (Ethiopia)
 Senior Citizens Day (Palau)
 Tango no sekku (Japan)
 May 6
 Martyrs' Day (Gabon)
 Martyrs' Day (Lebanon and Syria)
 International No Diet Day
 Teachers' Day (Jamaica)
 The first day of Hıdırellez (Turkey)
 St George's Day related observances (Eastern Orthodox Church):
 Day of Bravery, also known as Gergyovden (Bulgaria)
 Đurđevdan (Gorani, Roma)
 Police Day (Georgia)
 Yuri's Day (Russian Orthodox Church)
 May 7
 Defender of the Fatherland Day (Kazakhstan)
 Dien Bien Phu Victory Day (Vietnam)
 Radio Day (Russia, Bulgaria)
 May 8
 Miguel Hidalgo's birthday (Mexico)
 Parents' Day (South Korea)
 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War, continues to May 9
 Truman Day (Missouri, United States
 White Lotus Day (Theosophy)
 World Red Cross and Red Crescent Day
 Veterans Day (Norway)
 VE Day in Western Europe. In Eastern Europe it is celebrated on May 9.
 May 9
 Anniversary of Dianetics (Church of Scientology)
 Europe Day (European Union)
 Liberation Day (Guernsey), commemorating the end of the German occupation of the Channel Islands during World War II.
 Liberation Day (Jersey), commemorating the end of the German occupation of the Channel Islands during World War II.
 Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War, continued from May 8.
 Victory Day observances, celebration of the Soviet Union victory over Nazi Germany (Soviet Union, Azerbaijan, Belarus, Bosnia and Herzegovina, Georgia, Israel, Kazakhstan, Kyrgyzstan, Moldova, Russia, Serbia, Tajikistan, Turkmenistan, Uzbekistan)
 Victory Day over Nazism in World War II (Ukraine)
 Victory and Peace Day (Armenia) marks both the capture of Shusha (1992) in the First Nagorno-Karabakh War, and the end of World War II.
 May 10
 Children's Day (Maldives)
 Confederate Memorial Day (North Carolina and South Carolina)
 Constitution Day (Federated States of Micronesia)
 Golden Spike Day (1869 – Completion of the First transcontinental railroad – Promontory Summit, Utah)
 Independence Day (Romania), celebrating the declaration of independence of Romania from the Ottoman Empire in 1877.
 Liberation Day (Sark), commemorating the end of the German occupation of the Channel Islands during World War II.
 May 11
 National Technology Day (India)
 Statehood Day (Minnesota)
 Vietnam Human Rights Day (Vietnam)
 May 12
 Saint Andrea the First Day (Georgia (country))
 Day of the Finnish Identity (Finland)
 International Myalgic Encephalomyelitis/Chronic Fatigue Syndrome Awareness Day
 International Nurses Day
 May 13
 Abbotsbury Garland Day (Dorset, England)
 Heroes' Day (Romania)
 Rotuma Day (Rotuma, Fiji)
 May 14
 Hastings Banda's Birthday (Malawi)
 First day of Izumo-taisha Shrine Grand Festival. (Izumo-taisha, Japan)
 National Unification Day (Liberia)
 May 15
 Beginning of Tourette Syndrome awareness month. It ends on June 15
 Army Day (Slovenia)
 Constituent Assembly Day (Lithuania)
 Independence Day (Paraguay)
 International Day of Families
 Nakba Day (Palestinian communities)
 Peace Officers Memorial Day (United States)
 Republic Day (Lithuania)
 Saint Ubaldo Day
 Teachers' Day (Colombia, Mexico, South Korea)
 May 16
 Martyrs of Sudan (Episcopal Church (USA))
 St Brendan Birthday & Feast day
 Mass Graves Day (Iraq)
 National Day, declared by Salva Kiir Mayardit (South Sudan)
 Teachers' Day (Malaysia)
 May 17
 National Day Against Homophobia (Canada)
 International Day Against Homophobia, Transphobia and Biphobia, also known as IDAHOT
 Birthday of the Raja (Perlis)
 Children's Day (Norway)
 Constitution Day (Nauru)
 Galician Literature Day (Galicia (Spain))
 World Hypertension Day
 World Information Society Day
 Liberation Day (Democratic Republic of the Congo)
 Navy Day (Argentina)
 Norwegian Constitution Day
 May 18
 Baltic Fleet Day (Russia)
 Battle of Las Piedras Day (Uruguay)
 Day of Remembrance of Crimean Tatar genocide (Ukraine)
 Flag and Universities Day (Haiti)
 Independence Day (Somaliland) (unrecognized)
 International Museum Day
 Mullivaikkal Remembrance Day (Sri Lankan Tamils)
 Revival, Unity, and Poetry of Magtymguly Day (Turkmenistan)
 Teacher's Day (Syria)
 Victory Day (Sri Lanka)
 World AIDS Vaccine Day
 May 19
 Commemoration of Atatürk, Youth and Sports Day (Turkey, Northern Cyprus)
 Greek Genocide Remembrance Day (Greece)
 Hồ Chí Minh's Birthday (Vietnam)
 Malcolm X Day (United States of America)
 National Asian &amp; Pacific Islander HIV/AIDS Awareness Day
 Hepatitis Testing Day (United States)
 May 20
 Day of Remembrance (Cambodia)
 Emancipation Day (Florida)
 European Maritime Day (European Council)
 Independence Day (Cuba)
 Independence Day, East Timor
 Josephine Baker Day (NAACP)
 National Awakening Day (Indonesia)
 National Day (Cameroon)
 World Metrology Day
 May 21
 Afro-Colombian Day (Colombia)
 Circassian Day of Mourning (Circassians)
 Day of Patriots and Military (Hungary)
 Navy Day (Chile)
 Saint Helena Day, celebrates the discovery of Saint Helena in 1502.
 World Day for Cultural Diversity for Dialogue and Development (International)
 One of the three festivals of Vejovis  (Roman Empire)
 May 22
 Abolition Day (Martinique)
 Harvey Milk Day (California)
 International Day for Biological Diversity (International)
 National Maritime Day (United States)
 National Sovereignty Day (Haiti)
 Republic Day (Sri Lanka)
 Translation of the Relics of Saint Nicholas from Myra to Bari (Ukraine)
 Unity Day (Yemen)
 World Goth Day
 May 23
 Constitution Day (Germany)
 Labour Day (Jamaica)
 Students' Day (Mexico)
 World Turtle Day
 May 24
 Feast of Mary Help of Christians (Roman Catholicism)
 Aldersgate Day/Wesley Day (Methodism)
 Battle of Pichincha Day (Ecuador)
 Commonwealth Day (Belize)
 Independence Day (Eritrea)
 Lubiri Memorial Day (Buganda)
 Saints Cyril and Methodius Day (Eastern Orthodox Church) and its related observance:
 Bulgarian Education and Culture and Slavonic Literature Day (Bulgaria)
 Saints Cyril and Methodius, Slavonic Enlighteners' Day (North Macedonia)
 May 25
 Africa Day (African Union)
 African Liberation Day (African Union)
 Day of Youth
 Geek Pride Day
 Independence Day (Jordan)
 Liberation Day (Lebanon)
 May Revolution (or Revolución de Mayo), a national holiday in Argentina
 International Missing Children's Day
 Last bell (Russia, post-Soviet countries)
 Liberation Day (Lebanon)
 National Day (Argentina)
 National Missing Children's Day (United States)
 National Tap Dance Day (United States)
 Towel Day
 May 26
 Crown Prince's Birthday (Denmark)
 Independence Day (Guyana)
 Independence Day (Georgia)
 Mother's Day (Poland)
 National Day of Healing (Australia)
 National Paper Airplane Day (United States)
 May 27
 Armed Forces Day (Nicaragua)
 Children's Day (Nigeria)
 Mother's Day (Bolivia)
 Navy Day (Japan)
 Slavery Abolition Day (Guadeloupe, Saint Barthélemy, Saint Martin)
 World MS Day
 Start of National Reconciliation Week (Australia)
 May 28
 Armed Forces Day (Croatia)
 Downfall of the Derg Day (Ethiopia)
 Flag Day (Philippines) (Display of the flag in all places until June 12 is encouraged)
 Independence Day (Armenia)
 Republic Day (Nepal)
 TDFR Republic Day
 Youm-e-Takbir (Pakistan)
 May 29
 Army Day (Argentina)
 International Day of United Nations Peacekeepers (International)
 Oak Apple Day (England), and its related observance:
 Castleton Garland Day (Castleton)
 Statehood Day (Rhode Island and Wisconsin)
 Veterans Day (Sweden)
 World Digestive Health Day
 May 30
 Anguilla Day (Anguilla)
 Canary Islands Day (Spain)
 Indian Arrival Day (Trinidad and Tobago)
 Lod Massacre Remembrance Day (Puerto Rico)
 Mother's Day (Nicaragua)
 Parliament Day (Croatia)
 May 31
 Anniversary of Royal Brunei Malay Regiment (Brunei)
 Castile–La Mancha Day (Castile-La Mancha)
 Visitation of Mary (Western Christianity)
 World No Tobacco Day (International)

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