- Sep 11 Christophe Léon Louis Juchault de Lamoricière, French general, dies at 59
- Sep 16 Christian Julius De Meza, Danish general (b. 1792)
- Sep 20 William H Revere Jr, US Union brigadier general, dies
- Sep 22 Heinrich Christian Pander, Baltic German biologist and embryologist, dies at 71
- Sep 24 Frantiszek Sołtyk, Polish composer, dies at 81
- Sep 30 Samuel David Luzzatto, Italian-Jewish scholar, dies at 65