Johannes or Johann Praetorius may refer to:
Johannes Praetorius (mathematician) (1537–1616), German mathematician and astronomer Johannes Praetorius (historian) (1630–1680), German writer and historian Johann Praetorius (musician) (1634–1705), German educator, astronomer and musician Johann Praetorius (composer) (1595–1660), German Baroque composer and organist