- Sep 12 Richard Hoe, American inventor and industrialist, born in New York City (d. 1886)
- Sep 16 Robert Fortune, Scottish botanist and plant hunter (established East India tea company in India), born in Kelloe, Scotland (d. 1880)
- Sep 18 Herschel Vespasian Johnson, American politician (41st Governor of Georgia), born in Burke County, Georgia (d. 1880)
- Sep 29 Adolph Göpel, German mathematician (hyperelliptic functions), born in Rostock (d. 1847)