Wiedza Powszechna (literally "Common Knowledge") is a publishing house in Poland.
It originated in 1946 in Post World War II Poland as a subdivision of the Czytelnik publishing house, initiated by Stanisław Tazbir.  In 1952, with the major rearrangement of the state, which officially became the Polish People's Republic, the government created a separate State Publishing House Wiedza Powszechna (Państwowe Wydawnictwo Wiedza Powszechna). It became a major publisher specializing in dictionaries (vocabularies, encyclopedic dictionaries, etc., language texbooks, phrase books, etc. both for Polish and foreign languages, as well as popular science books in various areas. 
In 2007 it was privatized into a sp. z o.o. (Polish equivalent of limited liability company, which went bankrupt in 2011 
In 2012 it was reestablished in Warsaw as "Wydawnictwo Wiedza Powszechna" (Wiedza Powszechna Publishing House), specializing in foreign language dictionaries and textbooks.