- Sep 1 Jacobus J Cremer, painter/author (Overbetuwsche Novellen)
- Sep 5 Goffredo Mameli, Italian poet and writer, born in Genoa, Italy (d. 1849)
- Sep 6 John Morrison Oliver, American Brevet Major General (Union Army), born in Penn Yan, New York (d. 1872)
- Sep 8 Emil Naumann, German composer, born in Berlin (d. 1888)
- Sep 16 Jean Albert Gaudry, French geologist and palaeontologist, born in St Germain-en-Laye, France (d. 1908)
- Sep 21 Michael Corcoran, Irish-American Brigadier General (Union Army), born in County Sligo, Ireland (d. 1863)
- Sep 22 John Grubb Parke, American Major General (Union Army), born in NYC, New York (d. 1900)
- Sep 24 Henry Warner Slocum, American politician and Major General (Union Army), born in Pompey, New York (d. 1894)
Hiram R. Revels (1827-1901)
Sep 27 American clergyman, politician,1st African American in Congress (US Senator from Mississippi, 1870-71), and college president (Alcorn, 1871-82), born in Fayetteville, North Carolina
- Sep 30 Ellis H. Roberts, American politician, Treasurer of the US (Rep-R-New York), born in Utica, New York(d. 1918)
- Sep 30 Kenner Garrard, American Brevet Major General (Union Army), born in Bourbon County, Kentucky (d. 1879)