- International
- National and local
- Religious feast days
May Holidays and Observances
Every fixed-date holiday and observance in May, from international days to national holidays and religious feast days. Select a day to see its full list. The dates are the same every year, so holidays whose date moves, such as Easter, are not listed. All entries come from Wikipedia. For the events and famous birthdays of the month, see what happened in May in history.
1
40 holidays
2
16 holidays
3
16 holidays
4
26 holidays
5
30 holidays
6
18 holidays
7
13 holidays
8
25 holidays
9
17 holidays
10
Not available
11
6 holidays
12
14 holidays
13
12 holidays
14
13 holidays
15
23 holidays
16
17 holidays
17
18 holidays
18
14 holidays
19
18 holidays
20
21 holidays
21
17 holidays
22
20 holidays
23
14 holidays
24
Not available
25
24 holidays
26
15 holidays
27
Not available
28
Not available
29
16 holidays
30
17 holidays
31
12 holidays
Today's holidays
All May holidays by day
May has 492 fixed-date holidays and observances, including 35 international days, 157 national and local holidays, and 300 religious feast days. Highlights include World Tuna Day on May 2 and International Sun Day on May 3.
International
- International Sunflower Guerrilla Gardening Day Wikipedia source
- International Workers' Day or Labour Day (International), and its related observances: Law Day (United States), formerly intended to counterbalance the celebration of Labour Day. (United States) Wikipedia source
- International Workers' Day or Labour Day (International), and its related observances: Loyalty Day, formerly intended to counterbalance the celebration of Labour Day. (United States) Wikipedia source
National and local
- Armed Forces Day (Mauritania) Wikipedia source
- Constitution Day (Argentina, Latvia, Marshall Islands) Wikipedia source
- Commemoration of the states of Maharashtra and Gujarat following the foundation of Samyukta Maharashtra Samiti (India): Maharashtra Day Wikipedia source
- Lei Day (Hawaii) Wikipedia source
- May Day (beginning of Summer) observances in the Northern hemisphere (see April 30): Calan Mai (Wales) Wikipedia source
- May Day (beginning of Summer) observances in the Northern hemisphere (see April 30): Beltane (Gaelic) Wikipedia source
Religious feast days
- Aldebrandus Wikipedia source
- Amator Wikipedia source
- Andeolus Wikipedia source
- Aredius of Gap Wikipedia source
- Asaph Wikipedia source
- Augustin Schoeffler, Jean-Louis Bonnard (part of Vietnamese Martyrs) Wikipedia source
- Benedict of Szkalka Wikipedia source
- Bertha of Val d'Or Wikipedia source
- Brioc Wikipedia source
- James the Less (Anglican Communion) Wikipedia source
- Jeremiah Wikipedia source
- Saint Joseph the Worker (Roman Catholic) Wikipedia source
- Julian of Bale Wikipedia source
- Blessed Klymentiy Sheptytsky (Ukrainian Greek Catholic Church) Wikipedia source
- Mafalda of Portugal Wikipedia source
- Marcouf Wikipedia source
- Orientius Wikipedia source
- Peregrine Laziosi Wikipedia source
- Philip the Apostle (Anglican Communion, Lutheran Church) Wikipedia source
- Richard Pampuri Wikipedia source
- Seven Apostolic Men Caecilius of Elvira Wikipedia source
- Seven Apostolic Men Ctesiphon of Vergium Wikipedia source
- Seven Apostolic Men Euphrasius of Illiturgis Wikipedia source
- Seven Apostolic Men Hesychius of Cazorla Wikipedia source
- Seven Apostolic Men Indaletius Wikipedia source
- Seven Apostolic Men Secundus of Abula Wikipedia source
- Seven Apostolic Men Torquatus of Acci Wikipedia source
- Sigismund of Burgundy Wikipedia source
- Theodard Wikipedia source
- Ultan Wikipedia source
- May 1 (Eastern Orthodox liturgics) Wikipedia source
International
- World Tuna Day
National and local
- The last day of the Festival of Ridván (Baháʼí Faith) (this date is non-Gregorian and may change according to the March equinox, see List of observances set by the Baháʼí calendar) Wikipedia source
- Anniversary of the Dos de Mayo Uprising (Community of Madrid, Spain) Wikipedia source
- Birth Anniversary of Third Druk Gyalpo (Bhutan) Wikipedia source
- Flag Day (Poland) Wikipedia source
- Indonesia National Education Day Wikipedia source
- Teachers' Day (Iran) (this date is non-Gregorian and may change according to the March Equinox, see List of observances set by the Solar Hijri calendar) Wikipedia source
Religious feast days
- Ahudemmeh (Syriac Orthodox Church) Wikipedia source
- Athanasius of Alexandria (Western Christianity) Wikipedia source
- Bolesław Strzelecki (Catholic Church) Wikipedia source
- Boris I of Bulgaria (Bulgarian Orthodox Church) Wikipedia source
- Germanus of Normandy Wikipedia source
- Joseph Luu Van Nguyen (Catholic Church) Wikipedia source
- Wiborada (Catholic Church) Wikipedia source
- William Tirry (Catholic Church) Wikipedia source
- May 2 (Eastern Orthodox liturgics) Wikipedia source
International
- International Sun Day Wikipedia source
- World Press Freedom Day Wikipedia source
National and local
- Constitution Memorial Day (Japan) Wikipedia source
- Constitution Day (Poland) Wikipedia source
- Finding of the Holy Cross-related observances: Fiesta de las Cruces (Spain and Hispanic America) Wikipedia source
Religious feast days
- Abhai (Syriac Orthodox Church) Wikipedia source
- Blessed Emilia Bicchieri Wikipedia source
- Juvenal of Narni Wikipedia source
- Marie-Léonie Paradis Wikipedia source
- Moura and Timothy (Catholic and Coptic Church) Wikipedia source
- Philip and James the Lesser Wikipedia source
- Pope Alexander I Wikipedia source
- Sarah the Martyr (Coptic Church) Wikipedia source
- The Most Holy Virgin Mary, Queen of Poland Wikipedia source
- Theodosius of Kiev (Catholic and Eastern Orthodox Church) Wikipedia source
- May 3 (Eastern Orthodox liturgics) Wikipedia source
International
- Anti-Bullying Day (United Nations) Wikipedia source
- International Firefighters' Day Wikipedia source
- Star Wars Day (International observance) Wikipedia source
National and local
- Bird Day (United States) Wikipedia source
- Cassinga Day (Namibia) Wikipedia source
- Coal Miners Day (India) Wikipedia source
- Dave Brubeck Day (United States) Wikipedia source
- Death of Milan Rastislav Štefánik Day (Slovakia) Wikipedia source
- Greenery Day (Japan) Wikipedia source
- May Fourth Movement commemorations: Literary Day (Republic of China) Wikipedia source
- May Fourth Movement commemorations: Youth Day (China) Wikipedia source
- Remembrance Day for Martyrs and Disabled (Afghanistan) Wikipedia source
- Remembrance of the Dead (Netherlands) Wikipedia source
- Restoration of Independence Day (Latvia) Wikipedia source
- Youth Day (Fiji) Wikipedia source
Religious feast days
- Blessed Ceferino Giménez Malla Wikipedia source
- Blessed Michał Giedroyć Wikipedia source
- English Saints and Martyrs of the Reformation Era (Church of England) Wikipedia source
- F. C. D. Wyneken (Lutheran Church–Missouri Synod) Wikipedia source
- Florian Wikipedia source
- Jean-Martin Moye Wikipedia source
- John Houghton, Robert Lawrence and Augustine Webster Wikipedia source
- Judas Cyriacus Wikipedia source
- Monica of Hippo (1960 Roman Catholic Calendar) Wikipedia source
- Silvanus of Gaza Wikipedia source
- May 4 (Eastern Orthodox liturgics) Wikipedia source
International
- International Midwives' Day (International) Wikipedia source
- World Portuguese Language Day (International) Wikipedia source
National and local
- Children's Day (Japan, South Korea) Wikipedia source
- Cinco de Mayo (Mexico, United States) Wikipedia source
- Constitution Day (Kyrgyzstan) Wikipedia source
- Europe Day (Council of Europe) Wikipedia source
- Indian Arrival Day (Guyana) Wikipedia source
- Liberation Day (Denmark, Netherlands) Wikipedia source
- Lusophone Culture Day (Community of Portuguese Language Countries) Wikipedia source
- Martyrs' Day (Albania) Wikipedia source
- Missing and Murdered Indigenous Women Awareness Day (Canada and United States) Wikipedia source
- National Cartoonist Day Wikipedia source
- Patriots' Victory Day (Ethiopia) Wikipedia source
- Revenge of the Fifth (see Star Wars Day) Wikipedia source
- Senior Citizens Day (Palau) Wikipedia source
- Soviet Press Day (Soviet Union) Wikipedia source
- Tango no sekku (Japan) Wikipedia source
- Uyghur Doppa Cultural Festival (Doppa Day): 1–2 Wikipedia source
Religious feast days
- Angelus of Jerusalem Wikipedia source
- Aventinus of Tours Wikipedia source
- Blessed Caterina Cittadini Wikipedia source
- Blessed Edmund Ignatius Rice Wikipedia source
- Frederick the Wise (Lutheran Church–Missouri Synod) Wikipedia source
- Gotthard of Hildesheim Wikipedia source
- Blessed Grzegorz Bolesław Frąckowiak Wikipedia source
- Hilary of Arles Wikipedia source
- Jutta of Kulmsee Wikipedia source
- Stanisław Kazimierczyk Wikipedia source
- May 5 (Eastern Orthodox liturgics) Wikipedia source
- Feast of al-Khadr or Saint George (Palestinian) Wikipedia source
International
- International No Diet Day Wikipedia source
National and local
- Martyrs' Day (Lebanon and Syria) Wikipedia source
- National Azulejo Day (Portugal) Wikipedia source
- The first day of Hıdırellez (Turkey) Wikipedia source
Religious feast days
- Dominic Savio Wikipedia source
- Evodius of Antioch (Roman Catholic Church) Wikipedia source
- François de Laval Wikipedia source
- Jacinto Vera (Roman Catholic Church) Wikipedia source
- Lucius of Cyrene Wikipedia source
- Blessed Maria Caterina Troiani Wikipedia source
- Peter Nolasco Wikipedia source
- Petronax of Monte Cassino Wikipedia source
- Blessed Rosa Maria Benedetta Gattorno Custo Wikipedia source
- St George's Day related observances (Eastern Orthodox Church): Day of Bravery, also known as Gergyovden (Bulgaria) Wikipedia source
- St George's Day related observances (Eastern Orthodox Church): Đurđevdan (Gorani, Roma) Wikipedia source
- St George's Day related observances (Eastern Orthodox Church): Yuri's Day in the Spring (Russian Orthodox Church) Wikipedia source
- St John before the Latin Gate Wikipedia source
- May 6 (Eastern Orthodox liturgics) Wikipedia source
National and local
- Defender of the Fatherland Day (Kazakhstan) Wikipedia source
- Dien Bien Phu Victory Day (Vietnam) Wikipedia source
- Radio Day, commemorating the work of Alexander Popov (Russia, Bulgaria) Wikipedia source
Religious feast days
- Agathius of Byzantium Wikipedia source
- Agostino Roscelli Wikipedia source
- Anthony of Kiev Wikipedia source
- Pope Benedict II Wikipedia source
- Flavia Domitilla Wikipedia source
- Gisela of Hungary Wikipedia source
- Harriet Starr Cannon (Episcopal Church (USA)) Wikipedia source
- John of Beverley Wikipedia source
- Rose Venerini Wikipedia source
- May 7 (Eastern Orthodox liturgics) Wikipedia source
International
- Victory in Europe Day, and its related observances (Europe): Time of Remembrance and Reconciliation for Those Who Lost Their Lives during the Second World War, continues to May 9 Wikipedia source
- Victory in Europe Day, and its related observances (Europe): Day of Remembrance and Victory over Nazism in World War II 1939 – 1945 (Ukraine) Wikipedia source
- World Red Cross and Red Crescent Day (International) Wikipedia source
National and local
- Emancipation Day (Columbus, Mississippi) Wikipedia source
- Furry Dance (Helston, UK) Wikipedia source
- Liberation Day (Czech Republic) Wikipedia source
- Miguel Hidalgo's birthday (Mexico) Wikipedia source
- Parents' Day (South Korea) Wikipedia source
- Truman Day (Missouri) Wikipedia source
- Veterans Day (Norway) Wikipedia source
- White Lotus Day (Theosophy) Wikipedia source
Religious feast days
- Amato Ronconi Wikipedia source
- Pope Boniface IV Wikipedia source
- Apparition of Saint Michael Wikipedia source
- Arsenius the Great Wikipedia source
- Desideratus Wikipedia source
- Blessed Catherine of St. Augustine Wikipedia source
- Julian of Norwich (Anglican, Lutheran) Wikipedia source
- Magdalene of Canossa Wikipedia source
- Our Lady of Luján Wikipedia source
- Peter II of Tarentaise Wikipedia source
- Blessed Teresa Demjanovich (Ruthenian Catholic Church) Wikipedia source
- Blessed Ulrika Nisch Wikipedia source
- 19 Martyrs of Algeria Wikipedia source
- May 8 (Eastern Orthodox liturgics) Wikipedia source
International
- Commemoration of the end of the German occupation of the Channel Islands related observances: Liberation Day, commemorating the end of the German occupation of the Channel Islands during World War II. (Guernsey and Jersey) Wikipedia source
- 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 and Peace Day, marks the capture of Shusha (1992) in the First Nagorno-Karabakh War, and the end of World War II. (Armenia) Wikipedia source
National and local
- Commemoration of the end of the German occupation of the Channel Islands related observances: National Day (Alderney) Wikipedia source
- Europe Day, commemorating the Schuman Declaration. (European Union, Kosovo, Moldova, Ukraine) Wikipedia source
- Home Front Heroes Day in the United States (proposed; locally observed in Dallas, Texas) Wikipedia source
- Goku Day (Japan), commemorating the fictional character Goku Wikipedia source
Religious feast days
- Beatus of Vendome Wikipedia source
- Christopher (Eastern Orthodox Church) Wikipedia source
- George Preca Wikipedia source
- Gerontius of Cervia Wikipedia source
- Gregory of Nazianzen (The Episcopal Church (US) and traditional Roman Catholic calendar) Wikipedia source
- Blessed Karolina Gerhardinger Wikipedia source
- Nicolaus Zinzendorf (Lutheran) Wikipedia source
- Pachomius the Great Wikipedia source
- Blessed Thomas Pickering Wikipedia source
- Tudy of Landevennec Wikipedia source
- May 9 (Eastern Orthodox liturgics) Wikipedia source
Religious feast days
- Anthimus of Rome Wikipedia source
- Gangulphus of Burgundy Wikipedia source
- Blessed John Rochester Wikipedia source
- Ignatius of Laconi Wikipedia source
- Majolus of Cluny Wikipedia source
- Mamertus, the first of the Ice Saints Wikipedia source
International
- International ME/CFS and Fibromyalgia Awareness Day Wikipedia source
- International Nurses Day Wikipedia source
National and local
- J. V. Snellman Day or the Finnish Heritage Day (Finland) Wikipedia source
Religious feast days
- Blessed Joan of Portugal Wikipedia source
- Crispoldus Wikipedia source
- Dominic de la Calzada Wikipedia source
- Epiphanius of Salamis Wikipedia source
- Gregory Dix (Church of England) Wikipedia source
- Blessed Imelda Lambertini Wikipedia source
- Modoald Wikipedia source
- Nereus, Achilleus, Domitilla, and Pancras Wikipedia source
- Patriarch Germanus I of Constantinople (Catholic and Eastern Church) Wikipedia source
- Philip of Agira Wikipedia source
- Rictrude Wikipedia source
National and local
- Abbotsbury Garland Day (Dorset, England) Wikipedia source
- Rotuma Day (Rotuma) Wikipedia source
Religious feast days
- André-Hubert Fournet Wikipedia source
- Our Lady of Fátima Wikipedia source
- Conchita Barrecheguren (Roman Catholic) Wikipedia source
- Gerard of Villamagna Wikipedia source
- Glyceria Wikipedia source
- John the Silent (Roman Catholic) Wikipedia source
- Julian of Norwich (Roman Catholic) Wikipedia source
- Frances Perkins (Episcopal Church (USA)) Wikipedia source
- Servatius Wikipedia source
- May 13 (Eastern Orthodox liturgics) Wikipedia source
National and local
- Independence Day (Paraguay) Wikipedia source
- Hastings Banda's Birthday (Malawi) Wikipedia source
- National Unification Day (Liberia) Wikipedia source
- The first day of Izumo-taisha Shrine Grand Festival. (Izumo-taisha) Wikipedia source
Religious feast days
- Boniface of Tarsus Wikipedia source
- Justa, Justina and Henedina Wikipedia source
- Maria Domenica Mazzarello Wikipedia source
- Matthias the Apostle (Roman Catholic Church, Anglican Communion, Evangelical Lutheran Church in America) Wikipedia source
- Michael Garicoïts Wikipedia source
- Mo Chutu of Lismore (Roman Catholic Church) Wikipedia source
- Théodore Guérin Wikipedia source
- Victor and Corona Wikipedia source
- May 14 (Eastern Orthodox liturgics) Wikipedia source
International
- International Conscientious Objectors Day Wikipedia source
- International Day of Families (International) Wikipedia source
National and local
- Aoi Matsuri (Kyoto) Wikipedia source
- Army Day (Slovenia) Wikipedia source
- Constituent Assembly Day (Lithuania) Wikipedia source
- Independence Day (Paraguay), celebrates the independence of Paraguay from Spain in 1811. Celebrations for the anniversary of the independence begin on Flag Day, May 14 Wikipedia source
- Mother's Day (Paraguay) Wikipedia source
- Nakba Day (Palestinian communities) Wikipedia source
- Peace Officers Memorial Day (United States) Wikipedia source
- Republic Day (Lithuania) Wikipedia source
- Teachers' Day (Colombia, Mexico, and South Korea) Wikipedia source
Religious feast days
- Achillius of Larissa Wikipedia source
- Athanasius of Alexandria (Coptic Church) Wikipedia source
- Hallvard Vebjørnsson (Roman Catholic Church) Wikipedia source
- Hilary of Galeata Wikipedia source
- Isidore the Laborer, celebrated with festivals in various countries, the beginning of bullfighting season in Madrid Wikipedia source
- Jean-Baptiste de La Salle (Roman Catholic Church) Wikipedia source
- Kaleb of Axum Wikipedia source
- Peter, Andrew, Paul, and Denise (Roman Catholic Church) Wikipedia source
- Reticius (Roman Catholic Church) Wikipedia source
- Sophia of Rome (Roman Catholic church) Wikipedia source
- May 15 (Eastern Orthodox liturgical calendar) Wikipedia source
- La Corsa dei Ceri begins on the eve of the feast day of Saint Ubaldo. (Gubbio) Wikipedia source
National and local
- Martyrs of Sudan (Episcopal Church (USA)) Wikipedia source
- Mass Graves Day (Iraq) Wikipedia source
- National Day, declared by Salva Kiir (South Sudan) Wikipedia source
- Teachers' Day (Malaysia) Wikipedia source
Religious feast days
- Aaron (Coptic Church) Wikipedia source
- Abda and Abdjesus, and companions: Abdas of Susa Wikipedia source
- Andrew Bobola Wikipedia source
- Brendan the Navigator (Roman Catholic Church, Anglican Communion, Eastern Orthodox Church) Wikipedia source
- Caroline Chisholm (Church of England) Wikipedia source
- Gemma Galgani (Passionists Calendar) Wikipedia source
- Germerius Wikipedia source
- Honoratus of Amiens Wikipedia source
- Peregrine of Auxerre Wikipedia source
- Possidius Wikipedia source
- Simon Stock Wikipedia source
- Ubald (see Saint Ubaldo Day) Wikipedia source
- May 16 (Eastern Orthodox liturgics) Wikipedia source
International
- International Day Against Homophobia, Biphobia and Transphobia Wikipedia source
- World Hypertension Day Wikipedia source
- World Telecommunication and Information Society Day (International) Wikipedia source
National and local
- Birthday of the Raja (Perlis) Wikipedia source
- Children's Day (Norway) Wikipedia source
- Constitution Day (Nauru) Wikipedia source
- Constitution Day (Norway) Wikipedia source
- Galician Literature Day or Día das Letras Galegas (Galicia) Wikipedia source
- Liberation Day (Democratic Republic of the Congo) Wikipedia source
- Navy Day (Argentina) Wikipedia source
Religious feast days
- Giulia Salzano Wikipedia source
- Blessed Ivan Ziatyk Wikipedia source
- Paschal Baylon Wikipedia source
- Peter Lieou Wikipedia source
- William Hobart Hare (Episcopal Church (USA)) Wikipedia source
- Restituta Wikipedia source
- May 17 (Eastern Orthodox liturgics) Wikipedia source
- Feast of ‘Aẓamat (Baháʼí Faith, day shifts with March Equinox, see List of observances set by the Baháʼí calendar) Wikipedia source
International
- International Museum Day Wikipedia source
National and local
- Baltic Fleet Day (Russia) Wikipedia source
- Day of Remembrance of Crimean Tatar genocide (Ukraine) Wikipedia source
- Independence Day (Somaliland) (unrecognized) Wikipedia source
- National Speech Pathologist Day (United States) Wikipedia source
- Revival, Unity, and Poetry of Magtymguly Day (Turkmenistan) Wikipedia source
- Teacher's Day (Syria) Wikipedia source
Religious feast days
- Ælfgifu of Shaftesbury Wikipedia source
- Blessed Blandine Merten Wikipedia source
- Eric IX of Sweden Wikipedia source
- Felix of Cantalice Wikipedia source
- Pope John I Wikipedia source
- Venantius of Camerino Wikipedia source
- May 18 (Eastern Orthodox liturgics) Wikipedia source
National and local
- Pontian Greek Genocide Remembrance Day (Greece) Wikipedia source
- Commemoration of Atatürk, Youth and Sports Day (Turkey, Northern Cyprus) Wikipedia source
- Remembrance Day (Sri Lanka) Wikipedia source
- Hồ Chí Minh's Birthday (Vietnam) Wikipedia source
- Malcolm X Day (United States of America) Wikipedia source
- National Asian & Pacific Islander HIV/AIDS Awareness Day (United States) Wikipedia source
- Hepatitis Testing Day (United States) Wikipedia source
- Mother's Day (Kyrgyzstan) Wikipedia source
Religious feast days
- Calocerus (Eastern Orthodox Church) Wikipedia source
- Crispin of Viterbo Wikipedia source
- Dunstan (Roman Catholic Church, Eastern Orthodox Church; commemoration, Anglicanism) Wikipedia source
- Ivo of Kermartin Wikipedia source
- Joaquina Vedruna de Mas Wikipedia source
- Maria Bernarda Bütler Wikipedia source
- Peter Celestine Wikipedia source
- Pudentiana (Roman Catholic Church, Eastern Orthodox Church) Wikipedia source
- Blessed Umiliana de' Cerchi Wikipedia source
- May 19 (Eastern Orthodox liturgics) Wikipedia source
International
- World Bee Day Wikipedia source
- World Metrology Day Wikipedia source
National and local
- Day of Remembrance (Cambodia) Wikipedia source
- Emancipation Day (Florida) Wikipedia source
- European Maritime Day (European Council) Wikipedia source
- Independence Restoration Day, celebrates the independence of East Timor from Indonesia in 2002 Wikipedia source
- Josephine Baker Day (NAACP) Wikipedia source
- National Awakening Day (Indonesia), and its related observances: Indonesian Doctor Day (Indonesia) Wikipedia source
- National Day (Cameroon) Wikipedia source
- Doug the Pug Day (Nashville, Tennessee) Wikipedia source
Religious feast days
- Abercius and Helena Wikipedia source
- Alcuin of York Wikipedia source
- Aurea of Ostia Wikipedia source
- Austregisilus Wikipedia source
- Baudilus Wikipedia source
- Bernardino of Siena Wikipedia source
- Columba of Rieti Wikipedia source
- Lydia of Thyatira Wikipedia source
- Lucifer of Cagliari Wikipedia source
- Sanctan Wikipedia source
- May 20 (Eastern Orthodox liturgics) Wikipedia source
International
- International Tea Day (International) Wikipedia source
- World Day for Cultural Diversity for Dialogue and Development (International) Wikipedia source
National and local
- Afro-Colombian Day (Colombia) Wikipedia source
- Circassian Day of Mourning (Circassians) Wikipedia source
- Day of Patriots and Military (Hungary) Wikipedia source
- Independence Day, celebrates the Montenegrin independence referendum in 2006, celebrated until the next day. (Montenegro) Wikipedia source
- Navy Day (Chile) Wikipedia source
- Saint Helena Day, celebrates the discovery of Saint Helena in 1502. (Saint Helena, Ascension and Tristan da Cunha) Wikipedia source
Religious feast days
- Blessed Adílio Daronch and Manuel Gómez González Wikipedia source
- Blessed Franz Jägerstätter Wikipedia source
- Earliest day on which Corpus Christi can fall, while June 24 is the latest; held on Thursday after Trinity Sunday (often locally moved to Sunday). (Roman Catholic Church) Wikipedia source
- Eugène de Mazenod Wikipedia source
- Helena of Constantinople, also known as "Feast of the Holy Great Sovereigns Constantine and Helen, Equal-to-the-Apostles." (Eastern Orthodox Church, Anglican Communion) Wikipedia source
- Blessed Hemming of Turku Wikipedia source
- John Elliot (Episcopal Church) Wikipedia source
- Saints of the Cristero War, including Christopher Magallanes Wikipedia source
- May 21 (Eastern Orthodox liturgics) Wikipedia source
International
- International Day for Biological Diversity (International) Wikipedia source
- World Goth Day Wikipedia source
National and local
- Abolition Day (Martinique) Wikipedia source
- Aromanian National Day (marginal, celebration on May 23 is more common) Wikipedia source
- Harvey Milk Day (California) Wikipedia source
- United States National Maritime Day Wikipedia source
- National Sovereignty Day (Haiti) Wikipedia source
- Republic Day (Sri Lanka) Wikipedia source
- Translation of the Relics of Saint Nicholas from Myra to Bari (Ukraine) Wikipedia source
- Unity Day (Yemen), celebrates the unification of North and South Yemen into the Republic of Yemen in 1990 Wikipedia source
Religious feast days
- Castus and Emilius Wikipedia source
- Fulk Wikipedia source
- Humilita Wikipedia source
- Blessed John Forest Wikipedia source
- Blessed Maria Domenica Brun Barbantini Wikipedia source
- Michael Hồ Đình Hy (one of Vietnamese Martyrs) Wikipedia source
- Quiteria Wikipedia source
- Rita of Cascia Wikipedia source
- Romanus of Subiaco Wikipedia source
- May 22 (Eastern Orthodox liturgics) Wikipedia source
International
- World Turtle Day Wikipedia source
National and local
- Aromanian National Day Wikipedia source
- Constitution Day (Germany) Wikipedia source
- Labour Day (Jamaica) Wikipedia source
- Students' Day (Mexico) Wikipedia source
Religious feast days
- Aaron the Illustrious (Syriac Orthodox Church) Wikipedia source
- Desiderius of Vienne Wikipedia source
- Giovanni Battista de' Rossi Wikipedia source
- Julia of Corsica Wikipedia source
- Michael of Synnada Wikipedia source
- Nicolaus Copernicus and Johannes Kepler (Episcopal Church (USA)) Wikipedia source
- Quintian, Lucius and Julian Wikipedia source
- William of Perth Wikipedia source
- May 23 (Eastern Orthodox liturgics) Wikipedia source
International
- International Missing Children's Day and its related observances: National Missing Children's Day (United States), Wikipedia source
National and local
- Africa Day (African Union) Wikipedia source
- African Liberation Day (African Union, Rastafari) Wikipedia source
- First National Government / National Day (Argentina) Wikipedia source
- Geek Pride Day (geek culture) Wikipedia source
- Independence Day, celebrates the independence of Jordan from the United Kingdom in 1946 Wikipedia source
- Last bell (Russia, post-Soviet countries) Wikipedia source
- Liberation Day (Lebanon) Wikipedia source
- National Tap Dance Day (United States) Wikipedia source
- Towel Day in honour of the work of the writer Douglas Adams Wikipedia source
Religious feast days
- Aldhelm Wikipedia source
- Bede Wikipedia source
- Canius Wikipedia source
- Cristóbal Magallanes Wikipedia source
- Denis Ssebuggwawo Wasswa Wikipedia source
- Dionysius of Milan Wikipedia source
- Dúnchad mac Cinn Fáelad Wikipedia source
- Gerard of Lunel Wikipedia source
- Madeleine Sophie Barat Wikipedia source
- Mary Magdalene de Pazzi Wikipedia source
- Maximus (Mauxe) of Évreux Wikipedia source
- Pope Gregory VII Wikipedia source
- Zenobius of Florence Wikipedia source
- May 25 (Eastern Orthodox liturgics) Wikipedia source
National and local
- Independence Day, commemorates the declaration of independence of the Democratic Republic of Georgia in 1918 (Georgia) Wikipedia source
- Independence Day, celebrates the independence of Guyana from the United Kingdom in 1966 Wikipedia source
- Mother's Day (Poland) Wikipedia source
- National Paper Airplane Day (United States) Wikipedia source
- National Sorry Day (Australia) Wikipedia source
Religious feast days
- Andrew Kaggwa Wikipedia source
- Augustine of Canterbury (Anglican Communion and Eastern Orthodox) Wikipedia source
- Lambert of Vence Wikipedia source
- Mariana de Jesús de Paredes Wikipedia source
- Martyrs of the Paris Commune Wikipedia source
- Peter Sanz (one of Martyr Saints of China) Wikipedia source
- Philip Neri Wikipedia source
- Pope Eleutherius Wikipedia source
- Zachary, Bishop of Vienne Wikipedia source
- May 26 (Eastern Orthodox liturgics) Wikipedia source
International
- International Day of United Nations Peacekeepers (International) Wikipedia source
National and local
- Army Day (Argentina) Wikipedia source
- Ascension of Bahá'u'lláh (Baháʼí Faith) (Only if Baháʼí Naw-Rúz falls on March 21 of the Gregorian calendar) Wikipedia source
- Oak Apple Day (England), and its related observance: Castleton Garland Day (Castleton) Wikipedia source
- Veterans Day (Sweden) Wikipedia source
- Democracy Day (Nigeria) Wikipedia source
Religious feast days
- Bona of Pisa Wikipedia source
- Hypomone (Eastern Orthodox Church) Wikipedia source
- Joseph Gérard Wikipedia source
- Maximin of Trier Wikipedia source
- Pope Alexander of Alexandria (Eastern Orthodox Church) Wikipedia source
- Pope Paul VI Wikipedia source
- Richard Thirkeld Wikipedia source
- Theodosia of Constantinople (Eastern Orthodox Church) Wikipedia source
- Ursula Ledóchowska Wikipedia source
- May 29 (Eastern Orthodox liturgics) Wikipedia source
National and local
- Anguilla Day, commemorates the beginning of the Anguillian Revolution in 1967. (Anguilla) Wikipedia source
- Canary Islands Day (Spain) Wikipedia source
- Indian Arrival Day (Trinidad and Tobago) Wikipedia source
- Kaamatan, harvest festival in the state of Sabah and the federal territory of Labuan (Malaysia) Wikipedia source
- Lod Massacre Remembrance Day (Puerto Rico) Wikipedia source
- Mother's Day (Nicaragua) Wikipedia source
- Statehood Day (Croatia) Wikipedia source
Religious feast days
- Basil the Elder and Emmelia of Caesarea Wikipedia source
- Dymphna Wikipedia source
- Ferdinand III of Castile and León Wikipedia source
- Isaac of Dalmatia Wikipedia source
- Joan of Arc Wikipedia source
- Joseph Marello Wikipedia source
- Luke Kirby Wikipedia source
- Matiya Mulumba Wikipedia source
- Blessed Otto Neururer Wikipedia source
- May 30 (Eastern Orthodox liturgics) Wikipedia source
International
- World No Tobacco Day (International) Wikipedia source
National and local
- Anniversary of Royal Brunei Malay Regiment (Brunei) Wikipedia source
- Kaamatan, harvest festival in the state of Sabah and the federal territory of Labuan (Malaysia) Wikipedia source
- Borobi Day (Australia) Wikipedia source
Religious feast days
- Blessed Camilla Battista da Varano Wikipedia source
- Cantius, Cantianus, and Cantianilla Wikipedia source
- Hermias Wikipedia source
- Blessed Mariano da Roccacasale Wikipedia source
- Petronella Wikipedia source
- Blessed Robert Thorpe Wikipedia source
- Visitation of Mary (Western Christianity) Wikipedia source
- May 31 (Eastern Orthodox liturgics) Wikipedia source