| 112231 | October 1 | Event | 1989 – Denmark introduces the world's first legal modern same-sex civil union called "registered partnership". |
| 112232 | October 1 | Event | 1991 – The Siege of Dubrovnik begins. |
| 112233 | October 1 | Event | 1992 – Cartoon Network begins broadcasting. |
| 112234 | October 1 | Event | 1994 – Palau gains independence from the United Nations (trusteeship administered by the United States of America). |
| 112235 | October 1 | Event | 2001 – Jammu and Kashmir legislative assembly attack in which Jaish-e-Mohammed militants used a Tata Sumo vehicle loaded with explosives to attack the state legislature building in Srinagar, Kashmir, killing 38. |
| 112236 | October 1 | Event | 2009 – The Supreme Court of the United Kingdom takes over the judicial functions of the House of Lords. |
| 112237 | October 1 | Event | 2012 – A ferry collision off the coast of Hong Kong kills 38 people and injures 102 others. |
| 112238 | October 1 | Event | 2014 – A series of explosions at a gunpowder plant in the village of Gorni Lom in Northwestern Bulgaria completely destroys the factory, killing 15 people. |
| 112239 | October 1 | Event | 2015 – Umpqua Community College shooting: a gunman kills 9 people at a community college in Roseburg, Oregon. |
| 112240 | October 1 | Event | 2015 – Heavy rains triggered a major landslide in the village of El Cambray Dos within Santa Catarina Pinula, killing 280 people. |
| 112241 | October 1 | Birth | 208 – Alexander Severus, Roman emperor (d. 235) |
| 112242 | October 1 | Birth | 1207 – Henry III of England (d. 1272) |
| 112243 | October 1 | Birth | 1507 – Giacomo Barozzi da Vignola, Italian architect, designed the Church of the Gesù (d. 1573) |
| 112244 | October 1 | Birth | 1540 – Johann Jakob Grynaeus, Swiss pastor and theologian (d. 1617) |
| 112245 | October 1 | Birth | 1620 – Nicolaes Pieterszoon Berchem, Dutch painter (d. 1683) |
| 112246 | October 1 | Birth | 1671 – Luigi Guido Grandi, Italian monk, mathematician, and engineer (d. 1742) |
| 112247 | October 1 | Birth | 1685 – Charles VI, Holy Roman Emperor (d. 1740) |
| 112248 | October 1 | Birth | 1691 – Arthur Onslow, English lawyer and politician, Speaker of the House of Commons (d. 1768) |
| 112249 | October 1 | Birth | 1712 – William Shippen, American physician and politician (d. 1801) |
| 112250 | October 1 | Birth | 1724 – Giovanni Battista Cirri, Italian cellist and composer (d. 1808) |
| 112251 | October 1 | Birth | 1729 – Anton Cajetan Adlgasser, German organist and composer (d. 1777) |
| 112252 | October 1 | Birth | 1730 – Richard Stockton, American lawyer, jurist, and politician (d. 1781) |
| 112253 | October 1 | Birth | 1760 – William Thomas Beckford, English author and politician (d. 1844) |
| 112254 | October 1 | Birth | 1762 – Anton Bernolák, Slovak priest and linguist (d. 1813) |
| 112255 | October 1 | Birth | 1771 – Pierre Baillot, French violinist and composer (d. 1842) |
| 112256 | October 1 | Birth | 1791 – Sergey Aksakov, Russian soldier and author (d. 1859) |
| 112257 | October 1 | Birth | 1808 – Mary Anna Custis Lee, American wife of Robert E. Lee (d. 1873) |
| 112258 | October 1 | Birth | 1832 – Caroline Harrison, American educator, 24th First Lady of the United States (d. 1892) |
| 112259 | October 1 | Birth | 1832 – Henry Clay Work, American composer and songwriter (d. 1884) |
| 112260 | October 1 | Birth | 1835 – Ádám Politzer, Hungarian-Austrian physician and anatomist (d. 1920) |