- Sep 2 Guiseppe Giacosa, Italian screenwriter (libretti opera Puccini), dies
- Sep 5 Ludwig Boltzmann, Austrian physicist (thermodynamics), dies at 62
- Sep 13 Georg Jacobi, composer, dies at 66
- Sep 19 Maria Georgina Grey, British writer and founder of the Girls' Day School Trust (b. 1816)
- Sep 20 Robert R. Hitt, American politician (b. 1834)
- Sep 21 Samuel Arnold, Lincoln conspirator, dies at 72
- Sep 23 Jan van Rijswijck, Flemish journalist and Mayor of Antwerp, dies at 53