- Jul 12 Dolley Madison, 4th First Lady Of The United States (b. 1768)
- Jul 28 Charles Albert, King of Sardinia (1831-49), dies at 50
- Jul 30 Jacob Perkins, American inventor, dies at 83
- Jul 31 Sándor Petőfi, Hungarian poet (A virágnak megtiltani nem lehet - You Cannot Forbid the Flower), and revolutionary, last seen alive at the Battle of Segesvár (Transylvania), presumed killed in action at 26