- Apr 2 Franz Paul Lachner, German composer, born in Rain, Swabia, Germany (d. 1890)
- Apr 7 Flora Tristan, French writer and social activist, born in Paris (d. 1844)
- Apr 7 James Curtiss, Mayor of Chicago (d. 1859)
- Apr 14 Friedrich von Amerling, Austrian painter, born in Vienna, Austria (d. 1887)
- Apr 18 Charles Ferdinand Pahud, Governor General of the Dutch East Indies (1856-61), born in Amsterdam (d. 1873)
- Apr 21 Levin Minn Powell, American Commander (Union Navy), born in Winchester, Winchester City, Virginia (d. 1885)
- Apr 23 Jules J baron d'Anethan, Belgian minister of Justice, born in Brussels, Belgium (d. 1888)
- Apr 27 Alfred Julius Becher, Austrian journalist and composer, born in Manchester, England (d. 1848)
James Brooke (1803-1868)
Apr 29 British adventurer and 1st Rajah of Sarawak (1841-68), born in Bandel, near Calcutta, Bengal, British India
- Apr 30 Albrecht von Roon, Prussian soldier and statesman (Minister of War), born in Pleushagen, Poland (d. 1879)