- Jul 7 Alfred Pleasonton, American Major General (Union Army), born in Washington, D.C. (d. 1897)
- Jul 8 Waldimir "Kriz" Krzyzanowski, Polish-American engineer, politician, and Brigadier General (Union Army), born in Greater Poland Voivodeship, Poland (d. 1887)
- Jul 10 Rudolf von Bennigsen, German lawyer and politician, born in Lüneburg, Hanover (d. 1902)
- Jul 11 Adolphe-Abraham Samuel, Belgian composer, born in Liège, Belgium (d. 1898)
- Jul 12 Eugène Boudin, French painter (beach scenes), born in Honfleur, France (d. 1898)
- Jul 20 Alexander Schimmelfennig, Prussian-American political revolutionary and Brigadier General (Union Army), born in Bromberg, Kingdom of Prussia (d. 1865)
- Jul 23 Gabriel C. Wharton, American civil engineer and Brigadier General (Confederate Army), born in Culpeper County, Virginia (d. 1906)
- Jul 25 George B. Vashon, American, lawyer, academic and poet, first African American lawyer in NY, born in Carlisle, Pennsylvania (d. 1878)
- Jul 25 Richard James Oglesby, American politician and Major General (Union Army), born in Oldham County, Kentucky (d. 1899)
- Jul 28 Jacopo Foroni, Italian opera composer (I gladiatori; Advokathen Panthelin), and conductor, born in Verona, Italy (d. 1858)
- Jul 30 Eugenio Terziani, Italian composer, born in Rome (d. 1889)