- Sep 1 Frederick Russell Burnham, American scout and adventurer whose friendship with Baden-Powell inspired the founding of the international scouting movement, dies at 86
- Sep 6 Paul Guthnick, German astronomer, dies at 76
- Sep 12 Harry Rowe Shelley, American hymn composer, dies at 89
- Sep 20 Fiorello La Guardia, American politician (Mayor-R-NYC, 1933-45), dies at 64
- Sep 21 Harry Carey [Henry DeWitt Carey II], American actor (Mr. Smith Goes to Washington; Red River), dies at 69
- Sep 23 Nikola Petkov, leader of Bulgaria Boer party, hanged
- Sep 26 Hugh Lofting, English writer (Dr Dolittle), dies at 61
- Sep 28 Francisco Santiago, Filipino pianist, composer (Taga-ilog Symphony), conductor, and pedagogue, dies at 58
- Sep 28 William B. Davidson, American film actor dies at 59