- Apr 3 Louisa Maria, Queen of Belgium (1832-50), Wife of Leopold I), born in Château de Saint-Germain-en-Laye, France (d. 1850)
- Apr 6 Aaron Bernstein, German Jewish writer (Young Germany), born in Danzig (d. 1884)
- Apr 6 Alexander Herzen, Russian writer (d. 1870)
- Apr 6 Gavril Yakimovich Lomakin, Russian composer and teacher, born in Borisk-ovka, Russia (d. 1885)
- Apr 9 Randolph Barnes Marcy, American Brevet Major General (Union Army), born in Greenwich, Massachusetts (d. 1887)
- Apr 15 Théodore Rousseau, French painter, born in Paris (d. 1867)
- Apr 22 Solomon Caesar Malan, British orientalist, born in Geneva, Switzerland (d. 1894)
- Apr 23 Louis-Antoine Jullien, French conductor, born in Sisteron, France (d. 1860)
- Apr 26 Alfred Krupp, German arms merchant, born in Essen, Germany (d. 1887)
- Apr 27 Friedrich von Flotow, German composer, born in Teutendorf, Germany (d. 1883)
- Apr 27 William W. Snow, American politician, U.S. House of Representatives from New York (1851-53), born in Heath, Massachusetts (d. 1886)
- Apr 28 Daniel Henry Rucker, American Brevet Major General (Union Army), born in Belleville, New Jersey (d. 1910)
- Apr 30 Kaspar Hauser, German son of grand duke Karel van Bathe (who claimed to have grown up in the total isolation of a darkened cell) (d. 1833)
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