| September 23rd 1830 | | Dutch troops occupy Brussels
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| September 23rd 1835 | | HMS Beagle sails to Charles Island in Galapagos archipelago
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| September 23rd 1845 | | 1st baseball team, NY Knickerbockers organize, adopt rule code
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| September 23rd 1845 | | Hunger strike in Hague
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| September 23rd 1846 | | Johann Gottfried Galle & Heinrich d'Arrest find Neptune
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| September 23rd 1857 | | Russian warship Leffort disappears in Finland Gulf in storm; 826 die
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| September 23rd 1862 | | Lincoln's Emancipation is published in Northern Newspapers
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| September 23rd 1863 | | Confederate siege of Chattanooga begins
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| September 23rd 1864 | | Battle of Athens VA
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| September 23rd 1868 | | Grito de Lares proclaims Puerto Rico's independence (crushed by Spain)
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| September 23rd 1873 | | Tom Allen beats Mike McCale for Heavyweight Boxing title
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| September 23rd 1876 | | Ottawa Rough Riders play their 1st game
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| September 23rd 1877 | | Hurricane strikes Cura‡ao & Bonaire kills 200
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| September 23rd 1879 | | Baldwin steam motors tram 1st tried in Sydney Australia
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| September 23rd 1879 | | Richard Rhodes invented a hearing aid called the Audiophone
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