| 119491 | October 18 | Holiday and observance | Persons Day (Canada) |
| 119492 | October 19 | Event | 202 BC – Second Punic War: At the Battle of Zama, Roman legions under Scipio Africanus defeat Hannibal Barca, leader of the army defending Carthage. |
| 119493 | October 19 | Event | 439 – The Vandals, led by King Gaiseric, take Carthage in North Africa. |
| 119494 | October 19 | Event | 1216 – King John of England dies at Newark-on-Trent and is succeeded by his nine-year-old son Henry. |
| 119495 | October 19 | Event | 1386 – The Universität Heidelberg held its first lecture, making it the oldest German university. |
| 119496 | October 19 | Event | 1466 – The Thirteen Years' War ends with the Second Treaty of Thorn. |
| 119497 | October 19 | Event | 1469 – Ferdinand II of Aragon marries Isabella I of Castile, a marriage that paves the way to the unification of Aragon and Castile into a single country, Spain. |
| 119498 | October 19 | Event | 1512 – Martin Luther becomes a doctor of theology (Doctor in Biblia). |
| 119499 | October 19 | Event | 1649 – New Ross town, County Wexford, Ireland, surrenders to Oliver Cromwell. |
| 119500 | October 19 | Event | 1781 – At Yorktown, Virginia, representatives of British commander Lord Cornwallis handed over Cornwallis' sword and formally surrendered to George Washington and the comte de Rochambeau. |
| 119501 | October 19 | Event | 1789 – Chief Justice John Jay is sworn in as the first Chief Justice of the United States. |
| 119502 | October 19 | Event | 1805 – Napoleonic Wars: Austrian General Mack surrenders his army to the Grande Armée of Napoleon Bonaparte at the Battle of Ulm. Thirty thousand prisoners are captured and 10,000 casualties inflicted on the losers. |
| 119503 | October 19 | Event | 1812 – Napoleon Bonaparte retreats from Moscow. |
| 119504 | October 19 | Event | 1813 – The Battle of Leipzig concludes, giving Napoleon Bonaparte one of his worst defeats. |
| 119505 | October 19 | Event | 1822 – In Parnaíba Simplício Dias da Silva, João Cândido de Deus e Silva and Domingos Dias declare the independent state of Piauí. |
| 119506 | October 19 | Event | 1864 – Battle of Cedar Creek: Union Army under Philip Sheridan destroys a Confederate Army under Jubal Early. |
| 119507 | October 19 | Event | 1864 – St. Albans Raid: Confederate raiders launch an attack on Saint Albans, Vermont from Canada. |
| 119508 | October 19 | Event | 1866 – Venice, Annexion of Veneto and Mantua to Italy, at Hotel Europa, Austria hands over Veneto to France, which hands it immediately over to Italy. |
| 119509 | October 19 | Event | 1900 – Max Planck, in his house at Grunewald, on the outskirts of Berlin, discovers the law of black-body radiation (Planck's law). |
| 119510 | October 19 | Event | 1904 – Polytechnic University of the Philippines founded as Manila Business School through the superintendence of the American C.A. O'Reilley. |
| 119511 | October 19 | Event | 1912 – Italy takes possession of Tripoli, Libya from the Ottoman Empire. |
| 119512 | October 19 | Event | 1914 – The First Battle of Ypres begins. |
| 119513 | October 19 | Event | 1917 – The Love Field in Dallas is opened. |
| 119514 | October 19 | Event | 1921 – Portuguese Prime Minister António Granjo and other politicians are murdered in a Lisbon coup. |
| 119515 | October 19 | Event | 1922 – British Conservative MPs meeting at the Carlton Club vote to break off the Coalition Government with David Lloyd George of the Liberal Party. |
| 119516 | October 19 | Event | 1933 – Germany withdraws from the League of Nations. |
| 119517 | October 19 | Event | 1935 – The League of Nations places economic sanctions on fascist Italy for its invasion of Ethiopia. |
| 119518 | October 19 | Event | 1943 – The cargo vessel Sinfra is attacked by Allied aircraft at Souda Bay, Crete, and sunk. Two thousand ninety-eight Italian prisoners of war drown with it. |
| 119519 | October 19 | Event | 1943 – Streptomycin, the first antibiotic remedy for tuberculosis, is isolated by researchers at Rutgers University. |
| 119520 | October 19 | Event | 1944 – United States forces land in the Philippines. |