- Jul 1 Jadwiga Łuszczewska, Polish poet, born in Warsaw, Poland (d. 1908)
- Jul 2 Hendrick Peter Godfried Quack, Dutch lawyer, economist and historian, born in Zetten, Netherlands (d. 1917)
- Jul 10 James Abbott McNeill Whistler, American-British painter (Whistler's Mother), born in Lowell, Massachusetts (d. 1903)
- Jul 11 James McNeill Whistler, American artist (Whistler's Mother), born in Lowell, Massachusetts (d. 1903)
- Jul 16 Carlo Angeloni, Italian composer, born in Lucca, Italy (d. 1901)
- Jul 16 Peter Leyten, Bishop of Breda (1885-1914) (d. 1914)
- Jul 19 Edgar Degas, French impressionist painter, sculptor and artist (The Bellelli Family), born in Paris (d. 1917)
- Jul 22 Daniel McCook Jr, American Brigadier General (Union Army), born in Carrollton, Ohio (d. 1864)
- Jul 23 James Cardinal Gibbons, Archbishop of Baltimore, born in Baltimore, Maryland (d. 1921)
- Jul 31 Peter H Hugenholtz, Dutch reformer/founder (Free Parish)