| 106261 | September 17 | Event | 1939 – World War II: German submarine U-29 sinks the British aircraft carrier HMS Courageous. |
| 106262 | September 17 | Event | 1939 – Taisto Mäki becomes the first man to run the 10,000 metres in under 30 minutes, in a time of 29:52.6. |
| 106263 | September 17 | Event | 1940 – World War II: Following the German defeat in the Battle of Britain, Hitler postpones Operation Sea Lion indefinitely. |
| 106264 | September 17 | Event | 1941 – World War II: A decree of the Soviet State Committee of Defense, restoring Vsevobuch in the face of the Great Patriotic War, is issued. |
| 106265 | September 17 | Event | 1941 – World War II: Soviet forces enter Tehran marking the end of the Anglo-Soviet invasion of Iran. |
| 106266 | September 17 | Event | 1943 – World War II: The Russian city of Bryansk is liberated from Germans. |
| 106267 | September 17 | Event | 1944 – World War II: Allied Airborne troops parachute into the Netherlands as the "Market" half of Operation Market Garden. |
| 106268 | September 17 | Event | 1944 – World War II: Soviet troops launch the Tallinn Offensive against Germany and pro independence Estonian units. |
| 106269 | September 17 | Event | 1944 – World War II: German forces are attacked by the Allies in the Battle of San Marino. |
| 106270 | September 17 | Event | 1948 – The Lehi (also known as the Stern gang) assassinates Count Folke Bernadotte, who was appointed by the United Nations to mediate between the Arab nations and Israel. |
| 106271 | September 17 | Event | 1948 – The Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union. |
| 106272 | September 17 | Event | 1949 – The Canadian steamship SS Noronic burns in Toronto Harbour with the loss of over 118 lives. |
| 106273 | September 17 | Event | 1957 – Malaysia joins the United Nations. |
| 106274 | September 17 | Event | 1961 – The world's first retractable-dome stadium, the Civic Arena, opens in Pittsburgh, Pennsylvania. |
| 106275 | September 17 | Event | 1965 – The Battle of Chawinda is fought between Pakistan and India. |
| 106276 | September 17 | Event | 1974 – Bangladesh, Grenada and Guinea-Bissau join the United Nations. |
| 106277 | September 17 | Event | 1976 – The first Space Shuttle, Enterprise, is unveiled by NASA. |
| 106278 | September 17 | Event | 1978 – The Camp David Accords are signed by Israel and Egypt. |
| 106279 | September 17 | Event | 1980 – After weeks of strikes at the Lenin Shipyard in Gdańsk, Poland, the nationwide independent trade union Solidarity is established. |
| 106280 | September 17 | Event | 1980 – Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay. |
| 106281 | September 17 | Event | 1983 – Vanessa Williams becomes the first black Miss America. |
| 106282 | September 17 | Event | 1987 – Pope John Paul II embraces an AIDS-infected boy while visiting San Francisco. |
| 106283 | September 17 | Event | 1988 – The 1988 Summer Olympics, officially known as the Games of the XXIV Olympiad, were opened in Seoul, South Korea. |
| 106284 | September 17 | Event | 1991 – Estonia, North Korea, South Korea, Latvia, Lithuania, the Marshall Islands and Micronesia join the United Nations. |
| 106285 | September 17 | Event | 1991 – The first version of the Linux kernel (0.01) is released to the Internet. |
| 106286 | September 17 | Event | 1992 – An Iranian Kurdish leader and his two joiners are assassinated by political militants in Berlin, Germany. |
| 106287 | September 17 | Event | 2001 – The New York Stock Exchange reopens for trading after the September 11 attacks, the longest closure since the Great Depression. |
| 106288 | September 17 | Event | 2006 – Fourpeaked Mountain in Alaska erupts, marking the first eruption for the long-dormant volcano in at least 10,000 years. |
| 106289 | September 17 | Event | 2006 – An audio tape of a private speech by Hungarian Prime Minister Ferenc Gyurcsány is leaked to the public, in which he confessed that his Hungarian Socialist Party had lied to win the 2006 election, sparking widespread protests across the country. |
| 106290 | September 17 | Event | 2011 – Occupy Wall Street movement begins in Zuccotti Park, New York City. |