- Jul 11 Evgeny Baratynsky, Russian poet (b. 1800)
- Jul 12 Charles-Louis Panckoucke, French publisher, dies at 63
- Jul 15 Claude Charles Fauriel, French historian (b. 1772)
- Jul 23 Christian Gobrecht, 4th US chief engraver (1840-44), dies in office
- Jul 27 John Dalton, English physicist and chemist (molecular theorist), dies at 77
- Jul 28 Joseph Bonaparte, older brother of Napoleon I and King of Naples and Spain (b. 1768)