- Oct 10 Thomas Say, American naturalist and father of descriptive entomology, dies from typhoid fever at 47
- Oct 19 Cornelis Loots, Dutch accountant and poet (Volkswoede), dies at 69
- Oct 31 Éleuthère Irénée du Pont, French-American chemist and industrialist (E. I. du Pont de Nemours and Company), dies at 63