| 114961 | October 7 | Death | 2015 – Gail Zappa, American businesswoman (b. 1945) |
| 114962 | October 7 | Death | 2015 – Jurelang Zedkaia, Marshallese politician, 5th President of the Marshall Islands (b. 1950) |
| 114963 | October 7 | Holiday and observance | Christian feast day:Justina of PaduaHenry MuhlenbergOsgythOur Lady of the RosaryPope MarkSergius and BacchusOctober 7 (Eastern Orthodox liturgics) |
| 114964 | October 7 | Holiday and observance | Italian Evacuation Day (Libya) |
| 114965 | October 7 | Holiday and observance | Teacher's Day (Laos) |
| 114966 | October 7 | Holiday and observance | The first day of Nagasaki Kunchi, celebrated until October 9 (Nagasaki) |
| 114967 | October 8 | Event | 314 – Roman Emperor Licinius is defeated by his colleague Constantine I at the Battle of Cibalae, and loses his European territories. |
| 114968 | October 8 | Event | 451 – At Chalcedon, a city of Bithynia in Asia Minor, the first session of the Council of Chalcedon begins (ends on November 1). |
| 114969 | October 8 | Event | 1075 – Dmitar Zvonimir is crowned King of Croatia. |
| 114970 | October 8 | Event | 1200 – Isabella of Angoulême is crowned Queen consort of England. |
| 114971 | October 8 | Event | 1322 – Mladen II Šubić of Bribir, defeated in the battle of Bliska, is arrested by the Parliament. |
| 114972 | October 8 | Event | 1480 – Great stand on the Ugra river, a standoff between the forces of Akhmat Khan, Khan of the Great Horde, and the Grand Duke Ivan III of Russia, which results in the retreat of the Tataro-Mongols and the eventual disintegration of the Horde. |
| 114973 | October 8 | Event | 1573 – End of the Spanish siege of Alkmaar, the first Dutch victory in Eighty Years' War. |
| 114974 | October 8 | Event | 1582 – Because of the implementation of the Gregorian calendar this day does not exist in this year in Italy, Poland, Portugal and Spain. |
| 114975 | October 8 | Event | 1600 – San Marino adopts its written constitution. |
| 114976 | October 8 | Event | 1645 – Jeanne Mance opened the Hôtel-Dieu de Montréal, the first lay hospital in North America. |
| 114977 | October 8 | Event | 1806 – Napoleonic Wars: Forces of the British Empire lay siege to the port of Boulogne in France by using Congreve rockets, invented by Sir William Congreve. |
| 114978 | October 8 | Event | 1813 – The Treaty of Ried is signed between Bavaria and Austria. |
| 114979 | October 8 | Event | 1821 – The government of general José de San Martín establishes the Peruvian Navy. |
| 114980 | October 8 | Event | 1829 – Rail transport: Stephenson's The Rocket wins The Rainhill Trials. |
| 114981 | October 8 | Event | 1856 – The Second Opium War between several western powers and China begins with the Arrow Incident on the Pearl River. |
| 114982 | October 8 | Event | 1860 – Telegraph line between Los Angeles and San Francisco opens. |
| 114983 | October 8 | Event | 1862 – American Civil War: Battle of Perryville: Union forces under General Don Carlos Buell halt the Confederate invasion of Kentucky by defeating troops led by General Braxton Bragg at Perryville, Kentucky. |
| 114984 | October 8 | Event | 1871 – Four major fires break out on the shores of Lake Michigan in Chicago, Peshtigo, Wisconsin, Holland, Michigan, and Manistee, Michigan including the Great Chicago Fire, and the much deadlier Peshtigo Fire. |
| 114985 | October 8 | Event | 1879 – War of the Pacific: The Chilean Navy defeats the Peruvian Navy in the Battle of Angamos, Peruvian Admiral Miguel Grau is killed in the encounter. |
| 114986 | October 8 | Event | 1895 – Eulmi incident: Queen Min of Joseon, the last empress of Korea, is assassinated and her corpse burnt by Japanese infiltrators inside Gyeongbok Palace. |
| 114987 | October 8 | Event | 1904 – Edmonton, Alberta is incorporated as a city. |
| 114988 | October 8 | Event | 1904 – Prince Albert, Saskatchewan is incorporated as a city. |
| 114989 | October 8 | Event | 1912 – First Balkan War begins: Montenegro declares war against the Ottoman Empire. |
| 114990 | October 8 | Event | 1918 – World War I: In the Argonne Forest in France, United States Corporal Alvin C. York kills 28 German soldiers and captures 132, for which he is awarded the Medal of Honor. |