- Jul 1 Gideon Welles, 24th U.S. Secretary of the Navy under Presidents Abraham Lincoln and Andrew Johnson, born in Glastonbury, Connecticut (d. 1878)
- Jul 3 Joseph Labitzky, Bohemian composer, born in Krásno, Czech Republic (d. 1881)
- Jul 9 Thomas Davenport, American inventor (invented 1st commercial electric motor), born in Williamstown, Vermont (d. 1851)
- Jul 12 Charles-Louis Hanssens, Belgian composer, born in Ghent, Belgium (d. 1871)
- Jul 15 John Barnett, English composer (The Mountain Sylph), born in Bedford, England (d. 1892)
- Jul 21 David Hunter, American Major General (Union Army), born in Troy, New York (d. 1886)
Alexandre Dumas (1802-1870)
Jul 24 French author (The Three Musketeers, The Count of Monte Cristo), born in Aisne, France