Isambard Kingdom Brunel (1806-1859)
Apr 9 British engineer (SS Great Britain, Great Western Railway), born in Portsmouth, England
- Apr 10 Leonidas Polk, Lt. Gen. (Confederate Army), born in Raleigh, North Carolina (d. 1864)
- Apr 18 Ludwig Schuberth, German composer, born in Magdeburg, Germany (d. 1850)
- Apr 21 Peter van Schendel, Dutch-Belgian painter (Monsieur Chandelle), born in Terheijden, Netherlands (d. 1870)
- Apr 26 Karl Ludwig Friedrich Hetsch, German composer, born in Stuttgart, Germany (d. 1872)
- Apr 27 Maria Christina of the Two Sicilies, Queen of Spain (1829-33), born in Palermo, Italy (d. 1878)
- Apr 29 Ernst Freiherr von Feuchtersleben, Austrian physician and philosopher, born in Vienna (d. 1849)