- Sep 6 Lafayette "Lave" Cross [Vratislav Kriz], American MLB baseball infielder, 1892-1907 (Philadelphia Phillies, Philadelphia Athletics, and 5 other teams), dies of a heart attack at 61
- Sep 12 Sarah Frances Whiting, American physicist and astronomer, dies at 80
- Sep 12 Walther Amelung, German archaeologist, dies at 61
- Sep 14 Hugo Ball, German playwright and social critic (co-founder Flametti, Dada), dies of cancer at 41
Isadora Duncan (1877-1927)
Sep 14 American free form/interpretative dancer, dies at 50 due to her scarf becoming entangled in her car's wheel
- Sep 15 Herman Gorter, Dutch socialist and poet (May, Tiny Hero's Poem), dies at 62
- Sep 19 Michael Peter Ancher, Danish painter (b. 1849)
- Sep 20 George Nichols, American director and actor (His Favorite Pastime, Star Boarder), dies at 62 or 63
- Sep 22 Giannotto Bastianelli, Italian musician and composer, dies at 44
- Sep 27 Stephán G. Stephansson, Icelandic poet who lived in Canada, dies at 73 [1]
- Sep 29 Arthur Achleitner, German writer, dies at 69
- Sep 29 Willem Einthoven, Dutch physiologist and inventor of the electrocardiodiogram (Nobel Prize in Medicine 1924), dies at 67
- Sep 30 Samuel Garman, American zoologist, ichthyologist, herpetologist, and namesake of a Jamaican lizard, dies at 84
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning