- Sep 1 Donald Petrie, Scottish botanist and educator noted for his work in New Zealand, dies at 78
- Sep 7 John Wesley Work Jr., 1st African-American collector of folk songs and spirituals, dies at 52 or 54
- Sep 7 René Viviani, French historian and 61st Prime Minister of France (1914-15), dies at 61
- Sep 10 Henry Lincoln "Linc" Johnson, American attorney and politician, remembered as one of the most prominent early 20th century African-American Republicans, dies of a stroke at 55
- Sep 15 Leonard Borwick, English concert pianist, dies at 57
- Sep 16 Alexander Alexandrovich Friedman, Russian physicist (b. 1888)
- Sep 16 Leo Fall, Austria operetta composer (That Pink von Stambul), dies at 52
- Sep 29 Léon-Victor-Auguste Bourgeois, French Prime Minister (1895-96), Nobel Peace Prize 1920 as President of Council of the League of Nations ), dies at 74
- Sep 29 Runar Schildt, Finnish writer (Galgmannen), dies at 36
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning