| 116251 | October 11 | Event | 1138 – A massive earthquake strikes Aleppo, Syria. |
| 116252 | October 11 | Event | 1142 – A peace treaty between the Jin dynasty and Southern Song dynasty is formally ratified when a Jin envoy visits the Song court during the Jin–Song wars. |
| 116253 | October 11 | Event | 1531 – Huldrych Zwingli is killed in battle with the Roman Catholic cantons of Switzerland. |
| 116254 | October 11 | Event | 1582 – Because of the adoption of the Gregorian calendar, this day does not exist in this year in Italy, Poland, Portugal and Spain. |
| 116255 | October 11 | Event | 1614 – Adriaen Block and 12 Amsterdam merchants petition the States General for exclusive trading rights in the New Netherland colony. |
| 116256 | October 11 | Event | 1634 – The Burchardi flood: "The second Grote Mandrenke" killed around 15,000 men in North Friesland, Denmark and Germany. |
| 116257 | October 11 | Event | 1649 – Sack of Wexford: After a ten-day siege, English New Model Army troops (under Oliver Cromwell) stormed the town of Wexford, killing over 2,000 Irish Confederate troops and 1,500 civilians. |
| 116258 | October 11 | Event | 1727 – George II and Caroline of Ansbach are crowned King and Queen of Great Britain. |
| 116259 | October 11 | Event | 1767 – Surveying for the Mason–Dixon line separating Maryland from Pennsylvania is completed. |
| 116260 | October 11 | Event | 1776 – American Revolutionary War: Battle of Valcour Island: On Lake Champlain a fleet of American boats is defeated by the Royal Navy, but delays the British advance until 1777. |
| 116261 | October 11 | Event | 1797 – Battle of Camperdown: Naval battle between Royal Navy and Royal Netherlands Navy during the French Revolutionary Wars. The outcome of the battle was a decisive British victory. |
| 116262 | October 11 | Event | 1809 – Along the Natchez Trace in Tennessee, explorer Meriwether Lewis dies under mysterious circumstances at an inn called Grinder's Stand. |
| 116263 | October 11 | Event | 1811 – Inventor John Stevens' boat, the Juliana, begins operation as the first steam-powered ferry (service between New York City, New York, and Hoboken, New Jersey). |
| 116264 | October 11 | Event | 1833 – A big demonstration at the gates of the legislature of Buenos Aires forces the ousting of governor Juan Ramón Balcarce and his replacement with Juan José Viamonte. |
| 116265 | October 11 | Event | 1852 – The University of Sydney, Australia's oldest university, is inaugurated in Sydney. |
| 116266 | October 11 | Event | 1862 – American Civil War: In the aftermath of the Battle of Antietam, Confederate General J. E. B. Stuart and his men loot Chambersburg, Pennsylvania, during a raid into the north. |
| 116267 | October 11 | Event | 1864 – Campina Grande, Brazil, is established as a city. |
| 116268 | October 11 | Event | 1865 – Paul Bogle led hundreds of black men and women in a march in Jamaica, starting the Morant Bay rebellion. |
| 116269 | October 11 | Event | 1890 – In Washington, D.C., the Daughters of the American Revolution is founded. |
| 116270 | October 11 | Event | 1899 – Second Boer War begins: In South Africa, a war between the United Kingdom and the Boers of the Transvaal and Orange Free State erupts. |
| 116271 | October 11 | Event | 1899 – The Western League is renamed the American League. |
| 116272 | October 11 | Event | 1906 – San Francisco public school board sparks a diplomatic crisis between the United States and Japan by ordering Japanese students to be taught in racially segregated schools. |
| 116273 | October 11 | Event | 1910 – Former President Theodore Roosevelt becomes the first U.S. president to fly in an airplane. He flew for four minutes with Arch Hoxsey in a plane built by the Wright brothers at Kinloch Field (Lambert–St. Louis International Airport), St. Louis, Mis |
| 116274 | October 11 | Event | 1912 – First Balkan War: The Greek Army liberates the city of Kozani. |
| 116275 | October 11 | Event | 1918 – San Fermín earthquake hits western Puerto Rico. |
| 116276 | October 11 | Event | 1929 – J. C. Penney opens store #1252 in Milford, Delaware, making it a nationwide company with stores in all 48 U.S. states. |
| 116277 | October 11 | Event | 1941 – Beginning of the National Liberation War of Macedonia. |
| 116278 | October 11 | Event | 1942 – World War II: Battle of Cape Esperance: On the northwest coast of Guadalcanal, United States Navy ships intercept and defeat a Japanese fleet on their way to reinforce troops on the island. |
| 116279 | October 11 | Event | 1944 – Tuvan People's Republic or formerly Tannu Tuva is annexed by the U.S.S.R. |
| 116280 | October 11 | Event | 1950 – Television: CBS's mechanical color system is the first to be licensed for broadcast by the U.S. Federal Communications Commission. |