Pokój na Ziemi (English: Peace on Earth) is a science fiction novel by Stanisław Lem, first published in Sweden titled Fred på jorden in 1985. It is part of the Ijon Tichy series.
Some German collections have published chapter one (Polish title: Podwojenie) as a novelette with the title Die Verdoppelung. In the German translation of this novel titled Frieden auf Erden, chapter one is titled Zweigeteilt.
