| 104071 | September 12 | Event | 1988 – Hurricane Gilbert devastates Jamaica it turns towards Mexico's Yucatán Peninsula 2 days later, causing an estimated $5 billion in damage. |
| 104072 | September 12 | Event | 1990 – The two German states and the Four Powers sign the Treaty on the Final Settlement with Respect to Germany in Moscow, paving the way for German reunification. |
| 104073 | September 12 | Event | 1992 – NASA launches Space Shuttle Endeavour on STS-47 which marked the 50th shuttle mission. On board are Mae Carol Jemison, the first African-American woman in space, Mamoru Mohri, the first Japanese citizen to fly in a US spaceship, and Mark Lee and Ja |
| 104074 | September 12 | Event | 1992 – Abimael Guzmán, leader of the Shining Path, is captured by Peruvian special forces shortly thereafter the rest of Shining Path's leadership fell as well. |
| 104075 | September 12 | Event | 1994 – Frank Eugene Corder crashes a single-engine Cessna 150 into the White House's south lawn, striking the West wing and killing himself. |
| 104076 | September 12 | Event | 1999 – Indonesia announces it will allow international peace-keepers into East Timor. |
| 104077 | September 12 | Event | 2001 – Ansett Australia, Australia's first commercial interstate airline, collapses due to increased strain on the international airline industry, leaving 10,000 people unemployed. |
| 104078 | September 12 | Event | 2003 – The United Nations lifts sanctions against Libya after that country agreed to accept responsibility and recompense the families of victims in the 1988 bombing of Pan Am Flight 103. |
| 104079 | September 12 | Event | 2003 – Iraq War: In Fallujah, U.S. forces mistakenly shoot and kill eight Iraqi police officers. |
| 104080 | September 12 | Event | 2005 – Hong Kong Disneyland opens in Penny's Bay, Lantau Island, Hong Kong. |
| 104081 | September 12 | Event | 2007 – Former Philippine President Joseph Estrada is convicted of the crime of plunder. |
| 104082 | September 12 | Event | 2008 – The 2008 Chatsworth train collision in Los Angeles between a Metrolink commuter train and a Union Pacific freight train kills 25 people. |
| 104083 | September 12 | Event | 2011 – The 9/11 Memorial Museum in New York City opens to the public. |
| 104084 | September 12 | Event | 2014 – Oscar Pistorius is found guilty of the culpable homicide of his girlfriend, Reeva Steenkamp. |
| 104085 | September 12 | Event | 2015 – A series of explosions involving propane triggering nearby illegally stored mining detonators in the Indian town of Petlawad in the state of Madhya Pradesh kills at least 105 people with over 150 injured. |
| 104086 | September 12 | Birth | 1492 – Lorenzo de' Medici, Duke of Urbino (d. 1519) |
| 104087 | September 12 | Birth | 1494 – Francis I of France (d. 1547) |
| 104088 | September 12 | Birth | 1605 – William Dugdale, English genealogist and historian (d. 1686) |
| 104089 | September 12 | Birth | 1688 – Ferdinand Brokoff, Czech sculptor (d. 1731) |
| 104090 | September 12 | Birth | 1690 – Peter Dens, Flemish theologian and academic (d. 1775) |
| 104091 | September 12 | Birth | 1725 – Guillaume Le Gentil, French astronomer (d. 1792) |
| 104092 | September 12 | Birth | 1736 – Hsinbyushin, Burmese king (d. 1776) |
| 104093 | September 12 | Birth | 1740 – Johann Heinrich Jung, German author and academic (d. 1817) |
| 104094 | September 12 | Birth | 1768 – Benjamin Carr, English-American singer-songwriter, educator, and publisher (d. 1831) |
| 104095 | September 12 | Birth | 1797 – Samuel Joseph May, American activist (d. 1871) |
| 104096 | September 12 | Birth | 1812 – Edward Shepherd Creasy, English historian and jurist (d. 1878) |
| 104097 | September 12 | Birth | 1812 – Richard March Hoe, American engineer and businessman, invented the Rotary printing press (d. 1886) |
| 104098 | September 12 | Birth | 1818 – Richard Jordan Gatling, American inventor, invented the Gatling gun (d. 1903) |
| 104099 | September 12 | Birth | 1818 – Theodor Kullak, German pianist, composer, and educator (d. 1882) |
| 104100 | September 12 | Birth | 1830 – William Sprague, American businessman and politician, 27th Governor of Rhode Island (d. 1915) |