- Apr 2 Constantin Christian Dedekind, German composer and poet, born in Reinsdorf, Thuringia, Germany (d. 1715)
- Apr 16 Cornelis Evertsen the Younger, Dutch vice admiral of Zealand, born in Flushing, Netherlands (d. 1679)
- Apr 23 Johan van Waveren Hudde, Dutch mathematician (Concerning Reduction of Equations) and Mayor of Amsterdam (1672-1703), born in Amsterdam (d. 1704)