- Sep 5 Francois Devienne, composer, dies at 44
- Sep 9 Armand-Emmanuel Trial, French pianist and comic opera composer, dies at 30
- Sep 13 John Barry, 1st American commodore, dies
- Sep 15 Gian Francesco Albani, Italian Catholic cardinal (b. 1719)
- Sep 16 Nicolas Baudin, French explorer (b. 1754)
- Sep 17 Franz Xaver Sussmayr, composer, dies
- Sep 20 Robert Emmet, Irish nationalist, executed
- Sep 30 Charles Broche, French composer, dies at 51