- Jul 3 Eberhard Friedrich Walcker, German organ builder (Paulskirche Frankfurt), born in Bad Cannstatt, Stuttgart, Germany (d. 1872)
- Jul 5 Sylvester Graham, Minister and noted vegetarian (developed Graham cracker), born in Suffield, Connecticut (d. 1851)
- Jul 14 John Gibson Lockhart [Scorpion], Scottish biographer (Life of Sir Walter Scott), born in Lanarkshire, Scotland (d. 1854)
- Jul 24 Heinrich Christian Pander, Baltic German biologist and embryologist, born in Riga, Latvia (d. 1865)
- Jul 26 Johan Georg Forchhammer, Danish geologist, born in Husum, Denmark (d. 1865)
- Jul 28 Ignaz Bösendorfer, Austrian musician, and piano maker, born in Vienna, Austria (d. 1859)