- Sep 15 Georg Ritschel, German composer, born in Mannheim (d. 1805)
- Sep 20 Giacomo Quarenghi, Italian-Russian master builder and architect (Hermitage Theater), born in Rota d'Imagna, Republic of Venice (d. 1817)
- Sep 20 Thomas Grosvenor, American Revolutionary War hero (d. 1825)
- Sep 25 Frederick Willem II, King of Prussia (1786-97), born in Berlin Palace, Berlin (d. 1797)