| 104911 | September 14 | Event | 1763 – Seneca warriors defeat British forces at the Battle of Devil's Hole during Pontiac's War. |
| 104912 | September 14 | Event | 1791 – The Papal States lose Avignon to the French Empire. |
| 104913 | September 14 | Event | 1808 – Finnish War: Russians defeat the Swedes in the bloody Battle of Oravais. |
| 104914 | September 14 | Event | 1812 – Napoleonic Wars: The French Grande Armée enters Moscow. The Fire of Moscow begins as soon as Russian troops leave the city. |
| 104915 | September 14 | Event | 1814 – The poem Defence of Fort McHenry is written by Francis Scott Key. The poem is later used as the lyrics of The Star-Spangled Banner. |
| 104916 | September 14 | Event | 1829 – The Ottoman Empire signs the Treaty of Adrianople with Russia, thus ending the Russo-Turkish War. |
| 104917 | September 14 | Event | 1846 – Jang Bahadur and his brothers massacre about 40 members of the Nepalese palace court. |
| 104918 | September 14 | Event | 1847 – Mexican–American War: Winfield Scott captures Mexico City. |
| 104919 | September 14 | Event | 1862 – American Civil War: The Battle of South Mountain, part of the Maryland Campaign, is fought. |
| 104920 | September 14 | Event | 1901 – U.S. President William McKinley dies after an assassination attempt on September 6, and is succeeded by Vice President Theodore Roosevelt. |
| 104921 | September 14 | Event | 1914 – HMAS AE1, the Royal Australian Navy's first submarine, was lost at sea with all hands near East New Britain, Papua New Guinea. |
| 104922 | September 14 | Event | 1917 – Russia is officially proclaimed a republic. |
| 104923 | September 14 | Event | 1939 – World War II: The Estonian military boards the Polish submarine ORP Orzeł in Tallinn, sparking a diplomatic incident that the Soviet Union will later use to justify the annexation of Estonia. |
| 104924 | September 14 | Event | 1940 – Ip massacre: The Hungarian Army, supported by local Hungarians, kill 158 Romanian civilians in Ip, Sălaj, a village in Northern Transylvania, an act of ethnic cleansing. |
| 104925 | September 14 | Event | 1943 – World War II: The Wehrmacht starts a three-day retaliatory operation targeting several Greek villages in the region of Viannos, whose death toll would eventually exceed 500 persons. |
| 104926 | September 14 | Event | 1944 – World War II: Maastricht becomes the first Dutch city to be liberated by allied forces. |
| 104927 | September 14 | Event | 1954 – In a top secret nuclear test, a Soviet Tu-4 bomber drops a 40 kiloton atomic weapon just north of Totskoye village. |
| 104928 | September 14 | Event | 1958 – The first two German post-war rockets, designed by the German engineer Ernst Mohr, reach the upper atmosphere. |
| 104929 | September 14 | Event | 1959 – The Soviet probe Luna 2 crashes onto the Moon, becoming the first man-made object to reach it. |
| 104930 | September 14 | Event | 1960 – The Organization of Petroleum Exporting Countries (OPEC) is founded. |
| 104931 | September 14 | Event | 1960 – Congo Crisis: With CIA help, Mobutu Sese Seko seizes power in a military coup, suspending parliament and the constitution. |
| 104932 | September 14 | Event | 1969 – The US Selective Service selects September 14 as the First Draft Lottery date. |
| 104933 | September 14 | Event | 1975 – The first American saint, Elizabeth Ann Seton, is canonized by Pope Paul VI. |
| 104934 | September 14 | Event | 1979 – Afghan President Nur Muhammad Taraki is assassinated upon the order of Hafizullah Amin, who becomes the new president. |
| 104935 | September 14 | Event | 1982 – President-elect of Lebanon, Bachir Gemayel, is assassinated. |
| 104936 | September 14 | Event | 1984 – Joe Kittinger becomes the first person to fly a gas balloon alone across the Atlantic Ocean. |
| 104937 | September 14 | Event | 1985 – Penang Bridge, the longest bridge in Malaysia, connecting the island of Penang to the mainland, opens to traffic. |
| 104938 | September 14 | Event | 1985 – The Golden Girls a television sitcom premieres on NBC |
| 104939 | September 14 | Event | 1987 – The Toronto Blue Jays set a record for the most home runs in a single game, hitting 10 of them. |
| 104940 | September 14 | Event | 1992 – The Constitutional Court of Bosnia and Herzegovina declares the breakaway Croatian Republic of Herzeg-Bosnia to be illegal. |