- Jul 1 Ignaz Semmelweis, Hungarian physician who discovered the cause of puerperal (childbed) fever and introduced antisepsis into medical practice, born in Budapest, Hungary (d. 1865)
- Jul 6 Adolf Anderssen, German World Chess Champion (1851-66), born in Kingdom of Prussia (d. 1879)
- Jul 10 John Stuart Williams, American Brigadier General (Confederate Army), born in Mount Sterling, Kentucky (d. 1898)
- Jul 14 Nathaniel Lyon, American Brigadier General (Union Army), 1st Union General to die in battle, born in Ashford, Connecticut (d. 1861)
- Jul 15 Heinrich Esser, German violinist and composer, born in Mannheim (d. 1872)
- Jul 18 Louis Gerhard De Geer, 1st Swedish Prime Minister (1876-80), born in Finspång Castle, Sweden (d. 1896)
- Jul 24 Félix Godefroid, Belgian harpist and composer, born in Namur, Belgium (d. 1897)
Emily Brontë (1818-1848)
Jul 30 English novelist (Wuthering Heights), born in Thornton, West Yorkshire
