- Sep 12 Rainis, Latvian poet and playwright (b. 1865)
- Sep 18 Hermann Gradener, German composer, dies at 85
- Sep 23 Richard A Zsigmondy, Austria chemist (Nobel 1925), dies at 64
- Sep 25 Miller Huggins, American Baseball Hall of Fame 2nd baseman, manager (NY Yankees WS 1923, 27-28), dies of pyaemia at 51
- Sep 29 Giitji Tanaka, Japanese baron/general/premier (1927-29), dies at 66
- Sep 30 Charles Bonin, French explorer and diplomat (China), dies at 64