- Sep 8 Bernardo Ottani, Italian composer, born in Bologna, Italy (d. 1827)
- Sep 10 Carter Braxton, American farmer and signer (Declaration of Independence), born in King and Queen County, Virginia (d. 1797)
- Sep 15 Jean-Sylvain Bailly, French astronomer noted for his computation of an orbit for Halley’s Comet (1759) and author of History of Ancient Astronomy from Its Origin to the Establishment of the School of Alexandria, born in Paris (d. 1793)
- Sep 16 Johann Nikolaus Tetens, German-Danish philosopher and mathematician, born in Tetenbüll, Duchy of Schleswig, Denmark (d. 1807)