- Apr 11 Nicolaas Christiaan Kist, Dutch Reformed theologian and church historian, born in Woerden, Netherlands (d. 1859)
- Apr 15 Friedrich Georg Wilhelm von Struve, German-Russian astronomer, born in Altona, Hamburg (d. 1864)
- Apr 19 Ferdinand I, Emperor of Austria (1835-48), born in Vienna, Austria (d. 1875)