- Sep 2 Ernst Curtius, German archaeologist and historian (Olympia), born in the Free Imperial City of Lübeck (d. 1896)
- Sep 6 George-Étienne Cartier, French Canadian politician (joint Prime Minister of Canada 1858-62), born in Saint-Antoine-sur-Richelieu, Quebec, Canada (d. 1873)
- Sep 8 Charles-Étienne Brasseur de Bourbourg, French writer and historian, born in Bourbourg, France (d. 1874)