Hieronim Malecki (also Hieronymus Maeletius or Meletius) (1527, most likely in Kraków – 1583 or 1584 in Lyck, Ducal Prussia (now Ełk) was a Polish, Prussian Lutheran pastor and theologian, as well as a translator, publisher, writer and creator of literary Polish. In his translations into Polish, Hieronim, following his father, relied heavily on Czech, and even argued that Czech and Polish were a single language. This practice had origins in an argument between Hieronim's father and another Polish translator in Królewiec, Jan Seklucjan.