- Mar 5 John Georg I, Elector of Saxony (1611-56, Peace of Prague), born in Dresden, Saxony (d. 1656)
- Mar 13 Federico Cesi, Italian naturalist and founder of the first modern scientific society, the Accademia dei Lincei, 1603, born in Rome, Italy (d. 1630)
- Mar 16 Gerbrant A Bredero, Dutch poet and playwright (Klucht van de Koe), born in Amsterdam, Dutch Republic (d. 1618)