1st » List of holidays by country Eritrea known as Anniversary of the Start of the Armed Struggle (Eritrea)
1st » Beginning of Amerindian Heritage Month (Guyana) named Amerindian Heritage Month (Guyana)
1st » Christian feast day:
1st » Saint Giles e.g Giles
1st » The beginning of the Liturgical year Eastern Orthodox Church or new liturgical year (Eastern Orthodox Church and the Eastern Catholic Church)
1st » September 1 (Eastern Orthodox liturgics)
1st » Constitution Day (Slovakia)
1st » 1923 Great Kantō earthquake or Disaster Prevention Day (Japan)
1st » Earliest day on which Labor Day can fall, while September 7 is the latest; celebrated on the first Monday in September. (United States, Canada, Palau)
1st » First day of school in many countries in Asia, Europe and the Americas.
1st » Flag Day (Honduras)
1st » Independence Day, celebrates the independence of Uzbekistan from the Soviet Union in 1991.
4th » Moses and Aaron (Lutheranism or Lutheran Church and Eastern Orthodox Church)
4th » Saint Rosalia named Rosalia
4th » Rose of Viterbo
4th » Ultan of Ardbraccan
4th » September 4 (Eastern Orthodox liturgics)
4th » Paul Jones (bishop) (Episcopal Church (USA))
4th » Newspaper Carrier Day (United States)
5th » Christian Calendar of saints named feast day:
5th » Bertin
5th » Blessed Teresa of Calcutta
5th » Genebald
5th » Zechariah (priest) Zechariah and Elizabeth (biblical figure) Elisabeth (Anglican Church Anglican and Eastern Orthodox Church)
5th » Gregorio Aglipay (Episcopal Church (USA))
5th » September 5 (Eastern Orthodox liturgics)
5th » Earliest date on which Jeûne genevois can fall, while September 11 is the latest; celebrated on Thursday after the first Sunday of September. (Canton of Geneva)
5th » Jupiter Stator, commemorates that Jupiter (mythology) e.g Jupiter helped Romulus to stop the Sabines or Sabine invasion under Titus Tatius. (Roman Empire)
6th » Public holidays in São Tomé and Príncipe e.g Armed Forces Day (São Tomé and Príncipe)
6th » Christian feast days:
6th » Begga
6th » Chagnoald
6th » Gondulphus of Metz
6th » September 6 (Eastern Orthodox liturgics)
6th » Public holidays in Pakistan called Defence Day or Armed Forces Day Pakistan named Army Day (Pakistan)
6th » Flag Day (Bonaire)
6th » Independence Day, celebrates the independence of Swaziland from the United Kingdom in 1968
6th » Pregnancy and Infant Loss Remembrance Day (several U.S. states and Canadian provinces)
7th » Earliest day on which National Grandparents Day can fall, while September 13 is the latest; celebrated on the first Sunday after Labor Day. (United States)
7th » Independence Day (Brazil) known as Independence day, celebrates the independence of Brazil from Portugal in 1822
7th » Thylacine .22Benjamin.22 and searches known as National Threatened Species Day (Australia)
7th » Armed Forces Day Pakistan known as Pakistani Air Force Day since 1971. (Public holidays in Pakistan e.g Pakistan)
8th » Adrian and Natalia of Nicomedia (Roman Catholic Church)
8th » Nativity of Mary (Roman Catholic Church), (Anglo-Catholicism)
8th » Our Lady of Charity
8th » Pope Sergius I
8th » September 8 (Eastern Orthodox liturgics)
8th » Earliest day on which Public holidays in Turkmenistan known as Day of the Workers in the Oil, Gas, Power, and Geological Industry can fall, while September 14 is the latest; celebrated on the second Saturday in September. (Turkmenistan)
8th » Earliest day on which Public holidays in Estonia or Grandparents Day can fall, while September 14 is the latest; celebrated on the second Sunday in September. (Canada, Estonia)
8th » Earliest day on which Mid-Autumn Festival can fall, while October 8 is the latest; celebrated on the 15th day in the 8th month of Chinese calendar. (China, Chinese diaspora)
8th » Earliest day on which Public holidays in Turkmenistan known as Turkmen Bakhshi Day can fall, while September 14 is the latest; celebrated on the second Sunday in September. (Turkmenistan)
8th » Independence Day (Republic of Macedonia) named Independence Day, celebrates the independence of Republic of Macedonia known as Macedonia from Yugoslavia in 1991.
8th » International Literacy Day (International observances known as International)
8th » National day, also the feast of Our Lady of Meritxell. (Andorra)
8th » The first day of Fiestas de Santa Fe, marked by the burning of the Zozobra (New Mexico)
8th » Victory Day September 8 in Pakistan or Victory Day (Pakistan)
9th » Christian Calendar of saints known as feast day:
9th » Charles Lowder (Calendar of saints (Church of England) called Church of England)
9th » Ciarán of Clonmacnoise
9th » Peter Claver
9th » Synaxis of Ss. Joachim and Saint Anne or Anna, an Afterfeast. (Eastern Orthodox and Eastern Catholic Churches)
9th » September 9 (Eastern Orthodox liturgics)
9th » Chrysanthemum Day or 'Kiku no Sekku' (Japanese calendar National holidays known as Japan)
9th » Remembrance days in Slovakia or Day of the Victims of Holocaust and of Racial Violence (Slovakia)
9th » Festivity of Our Lady of Sanctuary of Arantzazu e.g Arantzazu (Oñati)
9th » Independence Day, celebrates the independence of Tajikistan from USSR in 1991.
10th » Amerindian Heritage Month (Guyana) known as Amerindian Heritage Day (Guyana)
10th » Christian Calendar of saints called feast day:
10th » Aubert of Avranches named Aubert
10th » Nicholas of Tolentino
10th » Theodard of Maastricht
10th » Alexander Crummell (Episcopal Church (USA))
10th » September 10 (Eastern Orthodox liturgics)
10th » Edmund James Peck, Missionary to the Eskimo, 1924 (commemoration, Anglican Church of Canada)
10th » Gibraltar National Day known as National Day (Gibraltar)
11th » Paphnutius of Thebes (Roman Catholic Church)
11th » Protus and Hyacinth
11th » Harry Burleigh (Episcopal Church (USA))
11th » September 11 (Eastern Orthodox liturgics)
11th » Death Anniversary of Muhammad Ali Jinnah called Quaid-e-Azam Muhammad Ali Jinnah, a former holiday. (Pakistan)
11th » Earliest date on which Enkutatash can fall, while September 12 is the latest, celebrated on the first day of Ethiopian calendar e.g Mäskäräm. (Ethiopia)
11th » Emergency telephone number or Emergency Number Day, proclaimed by President Ronald Reagan named Reagan on August 26 in 1987. (United States communities, particularly the local emergency services)
11th » National Day of Catalonia (Catalonia)
11th » Nayrouz (Coptic Orthodox Church)
11th » Patriot Day (United States)
13th » Christian Calendar of Saints known as feast day:
13th » Saint Aimé called Aimé
13th » Saint Ame or Ame
13th » John Chrysostom
13th » September 13 (Eastern Orthodox liturgics).
13th » 'Niños Héroes e.g Día de los Niños Héroes' (Mexico)
13th » Epulum Jovis, celebrated on the Roman calendar called Ides of September, during the Ludi Romani. (Roman Empire)
14th » Christian calendar of saints e.g feast day:
14th » Aelia Flaccilla (Eastern Orthodox Church)
14th » Crescentius of Rome
14th » Maternus of Cologne
14th » Saint Notburga
14th » September 14 (Eastern Orthodox liturgics)
14th » Feast of the Cross (Christianity)
14th » Formerly, the Wednesday, Friday and Saturday following 14 September were observed as one of the four sets of Ember days. In the Irish calendar they were known as Quarter tense. (Roman Catholic church called Roman Catholic and Anglican Churches)
14th » Brazil — Days of the City in:
14th » Viamão (1741, the State of Rio Grande do Sul).
14th » Presidente Prudente (1917, the State of São Paulo (state) known as São Paulo).
14th » Sinop, Mato Grosso e.g Sinop (1974, the State of Mato Grosso).
14th » Figueirão (2003, the State of Mato Grosso do Sul).
14th » India — Hindi named Hindi Day. The day Constituent Assembly adopted Hindi as the Official Language of the Union on 14 September 1949. Hence, it is celebrated as Hindi Day.
14th » Mexico — Flag flying days in Mexico known as Day of the State of Chiapas entry into the Union.
15th » Battle of Britain Battle of Britain Day or Battle of Britain Day (United Kingdom)
15th » Christian Calendar of saints called feast day:
15th » Catherine of Genoa
15th » James Chisholm (priest) known as James Chisholm (Episcopal Church (USA))
15th » Joseph Abibos
15th » Saint Nicomedes known as Nicomedes
15th » Our Lady of Sorrows
15th » September 15 (Eastern Orthodox liturgics).
15th » "Public holidays in Mexico e.g Cry of Dolores" or 'Grito de Dolores', celebrated on the eve of the Mexican War of Independence known as Independence Day (Mexico).
15th » Earliest day on which German-American Steuben Parade can fall, while September 21 is the latest; celebrated on the third Saturday in September. (United States, especially New York City)
15th » Earliest day on which National POW/MIA Recognition Day called POW/MIA Recognition Day can fall, while September 21 is the latest; celebrated on the third Friday in September. (United States)
15th » Earliest day on which 'Prinsjesdag' can fall, while September 21 is the latest; celebrated on the third Tuesday in September. (Netherlands)
15th » Earliest day on which Respect for the Aged Day can fall, while September 21 is the latest; celebrated on the third Monday in September. (Japan)
15th » Free Money Day
15th » Independence Day, celebrates the independence of Guatemala (a Días Patrios (Guatemala) e.g Patriotic Day), El Salvador, Honduras, Nicaragua, and Costa Rica from Spain in 1821.
15th » International Day of Democracy (International observance named International)
15th » Public holidays in Azerbaijan Other observances called Knowledge Day (Azerbaijan)
15th » Public holidays in Slovenia known as Restoration of Primorska to the Motherland Day (Slovenia)
15th » Silpa Bhirasri or Silpa Bhirasri Day (Thailand).
15th » The beginning of National Hispanic Heritage Month, celebrated until October 15 (United States)
16th » Christian Calendar of Saints called feast day:
16th » Curcodomus
16th » Cyprian (Roman Catholic Church)
16th » Edith of Wilton
16th » Euphemia
16th » Saint Ninian or Ninian
16th » Pope Cornelius
16th » Saint Ludmila named Ludmila
16th » September 16 (Eastern Orthodox liturgics).
16th » Brazil:
16th » Alagoas Statehood day (1902).
16th » Days of the Cities in the State of Minas Gerais:
16th » Caxambu (1901)
16th » Esmeraldas, Minas Gerais named Esmeraldas (1901)
16th » Itaúna (1901)
16th » Ituiutaba (1901)
16th » Jacutinga, Minas Gerais called Jacutinga (1901)
16th » Lambari, Minas Gerais known as Lambari (1901)
16th » Grito de Dolores, celebrates the declaration of independence of Mexico from Spain in 1810. 'See Fiestas Patrias (Mexico) known as Fiestas Patrias'
16th » Independence Day, celebrates the independence of Papua New Guinea from Australia in 1975.
16th » International Day for the Preservation of the Ozone Layer
17th » Constitution Day (United States) named Constitution Day (observed on the previous Friday if it falls Saturday, the following Monday if on a Sunday), Citizenship Day, Von Steuben Day. (United States)
17th » Operation Market Garden is still remembered with parachuting and dedications on this day. (Netherlands)
18th » Edward Bouverie Pusey (Episcopal Church (USA))
18th » Eustorgius I
18th » Joseph of Cupertino
18th » Methodius of Olympus
18th » Richardis
18th » September 18 (Eastern Orthodox liturgics)
18th » Public holidays in Azerbaijan Other observances named Day of National Music (Azerbaijan)
18th » Ryukyuan languages Status e.g Island Language Day (Okinawa Prefecture, Japan)
18th » National Day or 'Dieciocho', the date of the first Government Chilean War of Independence First Junta e.g Junta after the Chilean independence on February 12, 1818 (Chile)
19th » Public holidays in Chile named Armed Forces Day (Chile)
19th » Christian calendar of saints or feast day:
19th » Goeric of Metz
19th » Januarius (Western Christianity)
19th » Our Lady of La Salette
19th » Theodore of Tarsus (Church of England)
19th » Trophimus, Sabbatius, and Dorymedon
19th » September 19 (Eastern Orthodox liturgics)
19th » Remembrance days in Slovakia e.g Day of the First Public Appearance of the Slovak National Council (Slovakia)
19th » Independence Day, celebrates the independence of Saint Kitts and Nevis from the United Kingdom in 1983.
20th » Saint Agapitus e.g Agapitus (Western Christianity)
20th » Saint Eustace named Eustace (Western Christianity)
20th » John Coleridge Patteson (Anglicanism)
20th » Korean Martyrs, including Andrew Kim Taegon and Laurent-Marie-Joseph Imbert
20th » September 20 (Eastern Orthodox liturgics)
20th » Ragamuffin War (Brazilian state of Rio Grande do Sul)
20th » Independence Day of South Ossetia (not fully recognized)
20th » Public holidays in Thailand e.g National Youth Day (Thailand)
20th » The seventh day of the Eleusinian Mysteries, when the secret rites in the Telesterion began. (Ancient Greece)
21st » Autumnal equinox observances in the Northern hemisphere, vernal equinox observances in the Southern hemisphere (see September 22):
21st » Arbor Day (Brazil)
21st » Spring Day (Argentina)
21st » Christian Calendar of saints called Feast Day:
21st » Matthew the Evangelist (Western Church)
21st » Nativity of the Theotokos (Orthodox Church)
21st » September 21 (Eastern Orthodox liturgics)
21st » Public holidays in Armenia or Independence Day, celebrates the independence of Armenia from the Soviet Union in 1991.
21st » Public holidays in Belize called Independence Day, celebrates the independence of Belize from the United Kingdom in 1981.
21st » Public holidays in Malta called Independence Day, celebrates the independence of Malta from the United Kingdom in 1964.
21st » International Day of Peace (International observance named International)
22nd » Car-Free Days named Car-Free Day (Europe and Montreal, Canada)
22nd » Christian Calendar of saints or feast day:
22nd » Saint Candidus e.g Candidus
22nd » Digna and Emerita
22nd » Emmeram of Regensburg
22nd » Saint Maurice called Maurice (Western Church)
22nd » Saint Phocas called Phocas
22nd » Sadalberga
22nd » Theban Legion
22nd » Thomas of Villanova
22nd » Philander Chase (Episcopal Church (USA))
22nd » September 22 (Eastern Orthodox liturgics)
22nd » Earliest date for the autumnal equinox in the Northern Hemisphere and the vernal equinox in the Southern Hemisphere:
22nd » Autumnal Equinox Day (Japan)
22nd » French Republican Calendar e.g French Republican New Year, the first day ("Grape") in the Vendémiaire named Month of Vendémiaire. (French Revolution)
22nd » Harvest festival, celebrated on Harvest moon, the full moon nearest to the autumnal equinox. (Britain)
22nd » Mabon (Wicca) called Mabon in the Northern Hemisphere, Ostara in the Southern Hemisphere. (Neopagan Wheel of the Year)
22nd » The first day of Miķeļi (ancient Latvia)
22nd » Hobbit Day, the containing week is celebrated as Tolkien Week. (Tolkien fandom or American Tolkien Society)
22nd » Independence Day, celebrates the independence of Bulgaria from the Ottoman Empire in 1908.
22nd » Independence Day, celebrates the independence of Mali from France in 1960.
22nd » OneWebDay, an annual day of Internet celebration and awareness, started in 2006.
23rd » Celebrate Bisexuality Day (Bisexual community)
23rd » Christian Feast Day:
23rd » Adomnán
23rd » Pio of Pietrelcina e.g Padre Pio
23rd » Pope Linus
23rd » Sossius
23rd » Thecla (Roman Catholic Church)
23rd » September 23 (Eastern Orthodox liturgics).
23rd » The Holocaust in Lithuania known as Holocaust Memorial Day (Lithuania)
28th » Wenceslaus I, Duke of Bohemia called Wenceslas
28th » Richard Rolle, Walter Hilton and Margery Kempe (Episcopal Church (USA))
28th » September 28 (Eastern Orthodox liturgics).
28th » International Right to Know Day
28th » Public holidays in the Czech Republic named Czech Statehood Day (Czech Republic)
28th » Child pornography known as National Day of Awareness and Unity against Child Pornography (Philippines)
28th » World Heart Federation known as World Heart Day (World Heart Federation)
28th » World Rabies Day (International observance called International)
28th » Ask a Stupid Question Day (United States)
29th » Christian Calendar of saints known as feast day:
29th » Michaelmas, feast of the Archangels Michael (archangel) known as Michael, Gabriel, and Raphael (archangel) e.g Raphael. One of the four quarter days in the Irish calendar. (England and Ireland)
29th » Rhipsime
29th » September 29 (Eastern Orthodox liturgics)
29th » International Coffee Day
29th » Public holidays in Paraguay named Victory of Boquerón Day (Paraguay)
30th » Holidays in São Tomé and Príncipe or Agricultural Reform (Nationalization) Day (São Tomé and Príncipe)
30th » Public holidays in Mexico e.g Birth of Morelos (Mexico)
30th » Blasphemy Day (United States, Canada, other countries)
30th » Christian Calendar of saints called Feast Day:
30th » Gregory the Illuminator
30th » Honorius of Canterbury
30th » Jerome
30th » September 30 (Eastern Orthodox liturgics)
30th » Independence Day or Public holidays in Botswana known as Botswana Day, celebrate the independence of Botswana from United Kingdom in 1966.