- Sep 9 Napoléon JKP Bonaparte, French prince and member of National Convention, born in Trieste, Austrian Empire (d. 1891)
Charles Crocker (1822-1888)
Sep 16 American business tycoon and railroad executive (Central Pacific Railroad, Southern Pacific Railroad), born in Troy, New York
- Sep 19 Joseph Rodman West, American senator and Brevet Major General (Union Army), born in New Orleans, Louisiana (d. 1898)
- Sep 22 Eppa Hunton, American representative and Brigadier-General who fought in most ANV campaigns, born in Warrenton, Virginia (d. 1908)
- Sep 25 Adolph von Steinwehr, German-American Brigadier General (Union Army), born in Blankenburg, Brunswick, Germany (d. 1877)