Książka i Wiedza (KiW; ) is a Polish publishing house founded in 1948, soon after World War II. As of the mid-2010s it has published over 13,000 titles.

In communist Poland KiW was the leading state publisher of books about politics and history.

KiW now publishes non-fiction popular science books for the general reader, encyclopedias, dictionaries, history, philosophy, economy and self-help books on physical and psychological wellness.

Its popular authors include Max Weber, Karl Raimund Popper, Bertrand Russell, , Andrzej Zahorski, Henryk Samsonowicz, Nina Andrycz, and Jacek Pałkiewicz.

As of 2014, KiW's editor-in-chief and president is Włodzimierz Gałąska.

See also Czytelnik Publishing House State Publishing Institute PIW

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