- Sep 3 Nikita Balieff, Armenian vaudevillian and impresario (b. 1876 or 1877)
- Sep 5 Gustave Kahn, French Symbolist poet and art critic (b. 1859)
- Sep 12 Hermann Hirt, German linguist (Indo-European Grammar), dies at 70
- Sep 14 Irving Thalberg, American film producer (MGM), dies of pneumonia at 37
- Sep 14 Ossip Gabrilovich Russian-American pianist, conductor (Detroit Symphony, 1918-36), and composer, dies of stomach cancer at 58
- Sep 16 Karl Buresch, Austrian lawyer and politician, dies at 57
- Sep 17 Ettie Annie Rout, New Zealand activist (b. 1877)
- Sep 19 Vishnu Narayan Bhatkhande, Indian musicologist, dies at 76
- Sep 26 Harriet Monroe, American poet (You & I, A Poet's Life) and editor of Poetry magazine, dies at 75
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning