- Sep 3 John Montgomery, American Continental Congressman (b. 1722)
- Sep 5 John Home, Scottish writer (b. 1722)
- Sep 6 Louis-Pierre Anquetil, French historian (b. 1723)
- Sep 13 Saverio Bettinelli, Italian Jesuit writer, dies at 90
- Sep 17 Benjamin Bourne, American politician (Member of the U.S. House of Representatives from Rhode Island), dies at 53
- Sep 25 Richard Porson, English classical scholar (Porson's Law), dies at about 48
- Sep 26 Pavel Vranicky, Moravian-Austrian composer (Oberon – The Fairy King), and conductor, dies at 51
- Sep 27 Gaétan Vestris, French ballet dancer, dies at 79
Assassination
Car Crash
Hanging
Killed in Action
Plane Crash
Poisoning