- Sep 9 Charles Macartney, Australian cricket all-rounder (35 Tests, 2,131 runs at 41.78, 7 x 100s, 45 wickets), dies at 72
- Sep 11 Camillien Houde, French Canadian politician and Mayor of Montreal, dies at 69
- Sep 11 Robert Lach, Austrian composer, dies at 84
- Sep 11 Robert W. Service, English-Canadian poet (Cremation of Sam McGee), dies at 84
- Sep 15 (George) "Snuffy" Stirnweiss, American MLB baseball second baseman, 1943-52, 2X All-Star. AL Batting Title, 3X World Series (New York Yankees and 2 other teams), dies in a train wreck in Bayonne, New Jersey at 39
- Sep 17 Eugène Jungers, Belgian Governor of Rwanda Urundi, dies at 70
- Sep 17 Friedrich Adolf Paneth, Austrian-British chemist, dies at 71
- Sep 17 Herbie Fields [Bernfeld], American jazz saxophonist and bandleader ("Dardanella"), dies from an intentional overdose of sleeping pills at 39
- Sep 22 Mary Roberts Rinehart, American mystery writer and playwright (The Circular Staircase), dies at 82
- Sep 25 John B. Watson, American psychologist who popularized the scientific theory of behaviorism, dies at 80
- Sep 26 Carl Brisson, Danish actor (Ship Cafe, Ring, Song of Soho, Murder at the Vanities), dies of jaundice at 64
- Sep 28 Aarre Merikanto, Finnish composer (Juha; Schott Concerto), and educator, dies of lung cancer at 65
- Sep 30 Niels Bjerrum, Danish chemist (ph-stipulation), dies at 79
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning