- Sep 3 Fanya Kaplan, Russian who shot at Lenin on Aug 30th, executed at 28
- Sep 12 George Reid, fourth Prime Minister of Australia (b. 1845)
- Sep 18 Ernest Farrar, English composer and musician, dies fighting on the Western Front during WWI at 33
- Sep 19 Liza Lehmann, English composer, dies at 56
- Sep 25 John Ireland, Irish-American archbishop of St Paul (1888-1918), dies at 80
- Sep 25 Mikhail Alekseev, Russian general (Tsar Nicholas II's Chief of Staff), dies of a heart attack at 60
- Sep 28 Eduard von Keyserling, Baltic German writer (Dritte Stiege), dies at 63
- Sep 28 Freddie Stowers, American soldier (b. 1896)
- Sep 28 Georg Simmel, German sociologist and philosopher, dies at 60
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning