- Sep 1 Benjamin Dwight, American tennis championship umpire, dies
- Sep 1 "Kansas City" Frank [Melrose], American jazz and blues pianist, killed in a bar fight in Hammond, Indiana at 33
- Sep 6 Hugo Loudon, president-director (Royal Oil), dies at 81
- Sep 9 Gustav Ehrismann, German author and expert on the German language, dies at 85
- Sep 9 Hans Spemann, German embryologist (Nobel Prize in Physiology or Medicine 1935), dies at 72
- Sep 29 Friedrich Angel, German mathematician (group theory), dies at 79