1st » Public holidays in South Korea or Armed Forces Day (South Korea)
1st » Christian feast day:
1st » Abai (martyr) named Abai (Syrian Orthodox Church)
1st » Saint Bavo known as Bavo of Ghent
1st » Edward James (martyr) or Blessed Edward James
1st » Nicetius (Roman Catholic Church)
1st » Saint Remigius e.g Remigius
1st » Thérèse of Lisieux
1st » Protection/Patronage of the Theotokos (Eastern Catholic Churches)
1st » October 1 (Eastern Orthodox liturgics)
1st » Public holidays in Azerbaijan named Day of Prosecutors (Azerbaijan)
1st » Earliest day on which World Habitat Day can fall, while October 7 is the latest; celebrated on the first Monday of October. (International observances e.g International)
1st » Independence Day (Cyprus), celebrates the independence of Cyprus from United Kingdom in 1960.
1st » Independence Day (Nigeria), celebrates the independence of Nigeria from United Kingdom in 1960.
1st » Independence Day (Palau), celebrates the independence of Palau from the UN Trust Territory status in 1994.
1st » Independence Day (Tuvalu), celebrates the independence of Tuvalu from United Kingdom in 1978.
1st » International Day of Older Persons
1st » Public holidays in Indonesia known as Pancasila Sanctity Day (Indonesia)
1st » Public holidays in Cameroon e.g Unification Day (Cameroon)
8th » Saint Pelagia or Pelagia (Roman Catholic Church)
8th » Che Guevara in popular culture .22Saint Ernesto.22 in Bolivia known as San Ernesto, Che Guevera as a saint. (Bolivian campesinos)
8th » William Dwight Porter Bliss and Richard T. Ely (Episcopal Church (USA))
8th » October 8 (Eastern Orthodox liturgics)
8th » Earliest day on which Columbus Day United States observance named Columbus Day can fall, while October 14 is the latest; observed on the second Monday of October (United States)
8th » Earliest day on which International Day for Natural Disaster Reduction can fall, while October 14 is the latest; observed on the second Wednesday of October (Hawaii)
8th » Earliest day on which the first day of Fire Prevention Week can fall, while October 14 is the latest; observed on the second week of October. (United States and Canada)
8th » Independence Day (Croatia) known as Independence Day, celebrates the official separation of Croatia from Socialist Federal Republic of Yugoslavia known as Yugoslavia in 1991.
9th » Louis Bertrand (saint) known as Luis Beltran
9th » Robert Grosseteste(Anglican)
9th » Wilfred Grenfell (Episcopal Church (USA))
9th » October 9 (Eastern Orthodox liturgics)
9th » Hangul Day (South Korea)
9th » Independence Day, celebrates the independence of Uganda from United Kingdom in 1962.
9th » Public holidays in Ecuador called Independence of Guayaquil from Spain in 1820 (Guayaquil)
9th » Leif Erikson Day (United States, Iceland and Norway)
9th » National Day of Commemorating the Holocaust (Romania)
9th » Takayama Festival e.g Takayama Autumn Festival (Takayama, Gifu or Takayama)
10th » Christian Calendar of saints known as Feast Day:
10th » Saint Cerbonius or Cerbonius
10th » Paulinus of York (in England)
10th » Viktor of Xanten
10th » Vida Dutton Scudder (Episcopal Church (USA))
10th » October 10 (Eastern Orthodox liturgics)
10th » Thomas Traherne (commemoration, Anglicanism)
10th » Arbor Day (Poland)
10th » Double Ten Day (The National Day of Taiwan), celebrates outbreak of the Wuchang Uprising in 1911 that led to founding of the Republic of China in 1912
10th » Fiji Week named Fiji Day, celebrates the independence of Fiji from United Kingdom in 1970
10th » Flag days in Finland known as Finnish Literature Day (Finland)
10th » Public holidays in North Korea named Party Foundation Day (North Korea)
10th » Tau Epsilon Phi Founders Day (International observance called International)
10th » International observance October named World Day Against Death Penalty (International observances e.g International)
11th » Christian Calendar of saints e.g feast days:
11th » Alexander Sauli
11th » Andronicus, Probus, and Tarachus (Roman Catholic Church)
11th » Æthelburh of Barking
11th » Cainnech of Aghaboe
11th » Gummarus
11th » James the Deacon (Calendar of saints (Church of England) e.g Church of England)
11th » Lommán of Trim
11th » Archbishop Nectarius of Constantinople or Nectarius of Constantinople
11th » Philip the Evangelist
11th » Pope John XXIII (Roman Catholic Church)
11th » October 11 (Eastern Orthodox liturgics)
11th » General Pulaski Memorial Day (United States)
11th » International Day of the Girl Child (International)
11th » National Coming Out Day (multinational, including United Kingdom, Switzerland, and United States among others)
11th » Michelmas Old Michaelmas Day called Old Michelmas Day (Celts known as Celtic)
15th » Teresa of Ávila called Saint Teresa of Ávila (Doctor of Church)
15th » Hedwig of Silesia or Saint Hedwig of Silesia
15th » Thecla of Kitzingen or Saint Thecla of Kitzingen
15th » October 15 (Eastern Orthodox liturgics)
15th » Arbor Day e.g National Tree Planting Day (Sri Lanka)
15th » The Equirria or 'October equus', sacrifice of a horse to Mars (god) called Mars. (Roman Empire)
15th » Global Handwashing Day (International observance known as International)
15th » Pregnancy and Infant Loss Remembrance Day (Canada and the United States)
15th » Earliest day on which Sweetest Day can fall, while October 21 is the latest; celebrated on the third Saturday in October. (Great Lakes region (North America) known as Great Lakes Region)
21st » Nachos International Day of the Nacho known as International Day of the Nacho (Mexico and USA)
21st » Holidays in Taiwan named Overseas Chinese Day (Republic of China)
22nd » Christian Calendar of Saints named Feast Day:
22nd » Aaron the Illustrious (Syriac Orthodox Church)
22nd » Abercius of Hieropolis
22nd » Bertharius
22nd » Donatus of Fiesole
22nd » John Paul II
22nd » Mary Salome
22nd » Nunilo and Alodia
22nd » October 22 (Eastern Orthodox liturgics)
22nd » Earliest day on which Labour day New Zealand known as Labour Day can fall, while October 28 is the latest; celebrated on the fourth Monday in October (New Zealand)
22nd » Earliest day on which Make a Difference Day Make A Difference Day or Make a Difference Day can fall, while October 28 is the latest; celebrated on the fourth Saturday in October (United States)
22nd » Spiritual New Year, in Eckankar
22nd » Gustav Fechner or Fechner Day, celebrated by psychophysics called Psychophysicists
22nd » International Stuttering Awareness Day (International observances or International)
24th » Independence Day, celebrates the independence of Zambia from United Kingdom in 1964.
24th » Public holidays in Egypt known as Suez Day (Egypt)
24th » United Nations Day, the anniversary of the Charter of the United Nations called 1945 Charter of the United Nations (International observance called International)
24th » World Development Information Day (International observance e.g International)
25th » Armed Forces Day Romania e.g Armed Forces Day (Romania)
28th » Abgar V of Edessa (Eastern Orthodox Church)
28th » Eadsige
28th » Fidelis of Como (Roman Catholic Church)
28th » Saint Faro called Faro
28th » Godwin of Stavelot
28th » Job of Pochayiv (repose) (Eastern Orthodox Church)
28th » Jude the Apostle (Western Christianity)
28th » Lord of Miracles (Lima)
28th » Simon the Zealot (Western Christianity)
28th » October 28 (Eastern Orthodox liturgics)
28th » Remembrance days in Slovakia known as Day of the Establishment of an Independent Czecho-Slovak State, celebrates the independence of Czechoslovakia from Austria-Hungary in 1918. (Czech Republic and Slovakia)
28th » International Animation Day (ASIFA)
28th » Ohi Day named Ochi Day (Greece, Cyprus and the Greeks e.g Greek communities)
28th » 1891 Mino-Owari earthquake called Prefectural Earthquake Disaster Prevention Day (Gifu Prefecture)
29th » Christian Calendar of saints known as Feast Day:
29th » Abraham of Rostov
29th » Douai Martyrs
29th » Gaetano Errico
29th » James Hannington (Anglicanism)
29th » Narcissus of Jerusalem (Roman Catholic Church)
29th » October 29 (Eastern Orthodox liturgics)
29th » Public holidays in Cambodia known as Coronation Day (Cambodia)
30th » Remembrance days in Slovakia or Anniversary of the Declaration of the Slovak Nation (Slovakia)
30th » Christian Feast Day:
30th » Alphonsus Rodriguez or Alonso Rodríguez
30th » Saint Herbert e.g Herbert
30th » Marcellus of Tangier
30th » Saturninus of Cagliari
30th » Serapion of Antioch
30th » John Wycliffe (Episcopal Church (USA))
30th » October 30 (Eastern Orthodox liturgics)
30th » Day of Remembrance of the Victims of Political Repressions (former Soviet republics, except Ukraine)
30th » Orthopaedic nursing called International Orthopaedic Nurses Day
31st » Abaidas (Coptic Orthodox Church of Alexandria known as Coptic Church)
31st » St. Quentin called Quentin
31st » Martin Luther (Anglican Communion)
31st » Paul Shinji Sasaki and Philip Lindel Tsen (Episcopal Church (USA))
31st » October 31 (Eastern Orthodox liturgics)
31st » Earliest day on which Public holidays in Finland e.g All Saints Day can fall, while November 6 is the latest; celebrated on Saturday between October 31 and November 6 (Finland, Sweden)
31st » Eve of Winter, the eve of the first day of winter in the Northern hemisphere (see November 1):
31st » Allantide (Cornwall)
31st » Halloween (Republic of Ireland e.g Ireland, Canada, United Kingdom, United States and Halloween around the world called other places)
31st » Samhain in the Northern Hemisphere, Beltane in the Southern Hemisphere; begins on sunset of October 31 (Gaelic calendar e.g Gaels, Welsh people and Neopagan Wheel of the Year)