| 100107 | September 3 | Birth | 1840 – Jacob Christian Fabricius, Danish composer (d. 1919) |
| 100108 | September 3 | Birth | 1841 – Tom Emmett, English cricketer (d. 1904) |
| 100109 | September 3 | Birth | 1849 – Sarah Orne Jewett, American author and poet (d. 1909) |
| 100110 | September 3 | Birth | 1851 – Olga Constantinovna of Russia (d. 1926) |
| 100081 | September 3 | Event | 1954 – The German U-boat U-505 begins its move from a specially constructed dock to its site at Chicago's Museum of Science and Industry. |
| 100082 | September 3 | Event | 1967 – Dagen H in Sweden: Traffic changes from driving on the left to driving on the right overnight. |
| 100083 | September 3 | Event | 1971 – Qatar becomes an independent state. |
| 100084 | September 3 | Event | 1976 – Viking program: The American Viking 2 spacecraft lands at Utopia Planitia on Mars. |
| 100085 | September 3 | Event | 1981 – Convention on the Elimination of All Forms of Discrimination Against Women enters into force. |
| 100086 | September 3 | Event | 1987 – In a coup d'état in Burundi, President Jean-Baptiste Bagaza is deposed by Major Pierre Buyoya. |
| 100087 | September 3 | Event | 1994 – Sino-Soviet split: Russia and the People's Republic of China agree to de-target their nuclear weapons against each other. |
| 100088 | September 3 | Event | 1997 – Vietnam Airlines Flight 815 (Tupolev Tu-134) crashes on approach into Phnom Penh airport, killing 64. |
| 100089 | September 3 | Event | 2001 – In Belfast, Protestant loyalists begin a picket of Holy Cross, a Catholic primary school for girls. For the next 11 weeks, riot police escort the schoolchildren and their parents through hundreds of protesters, some of whom hurl missiles and abuse. |
| 100090 | September 3 | Event | 2004 – The Beslan school hostage crisis ends on its third day with the deaths of over 300 people, more than half of whom are children. |
| 100091 | September 3 | Event | 2014 – Heavy monsoon rains and flash floods leave over 200 people dead across India and Pakistan. |
| 100092 | September 3 | Event | 2015 – China's Victory Day Parade is held in Beijing to celebrate the 70th Victory over Japan Day of the Second World War. |
| 100093 | September 3 | Birth | 1034 – Emperor Go-Sanjō of Japan (d. 1073) |
| 100094 | September 3 | Birth | 1499 – Diane de Poitiers, French mistress of Henry II of France (d. 1566) |
| 100095 | September 3 | Birth | 1568 – Adriano Banchieri, Italian organist and composer (d. 1634) |
| 100096 | September 3 | Birth | 1675 – Paul Dudley, American lawyer and jurist (d. 1751) |
| 100097 | September 3 | Birth | 1693 – Charles Radclyffe, English captain and politician (d. 1746) |
| 100098 | September 3 | Birth | 1695 – Pietro Locatelli, Italian viola player and composer (d. 1764) |
| 100099 | September 3 | Birth | 1710 – Abraham Trembley, Swiss biologist and zoologist (d. 1784) |
| 100100 | September 3 | Birth | 1724 – Guy Carleton, 1st Baron Dorchester, Irish-English general and politician, 21st Governor General of Canada (d. 1808) |
| 100101 | September 3 | Birth | 1781 – Eugène de Beauharnais, French general and politician (d. 1824) |
| 100102 | September 3 | Birth | 1803 – Prudence Crandall, American educator (d. 1890) |
| 100103 | September 3 | Birth | 1810 – Paul Kane, Irish-Canadian painter (d. 1871) |
| 100104 | September 3 | Birth | 1811 – John Humphrey Noyes, American activist, founded the Oneida Community (d. 1886) |
| 100105 | September 3 | Birth | 1814 – James Joseph Sylvester, English mathematician and academic (d. 1897) |
| 100106 | September 3 | Birth | 1820 – George Hearst, American businessman and politician (d. 1891) |