- Sep 1 Frederick Russell Burnham, father of the international Scouting movement (b. 1861)
- Sep 6 Paul Guthnick, German astronomer, dies at 76
- Sep 12 Harry Rowe Shelley, American composer (known for his hymn music), 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, composer, dies at 58
- Sep 28 William B. Davidson, American film actor dies at 59