Wielka Encyklopedia PWN (Great PWN Encyclopedia) is a universal encyclopedia in Polish, published by Państwowe Wydawnictwo Naukowe (State Scientific Publishers, PWN) in Warsaw, between 2001 and 2005.
It is a replacement for the socialist-era Wielka Encyklopedia Powszechna PWN (Great Universal Encyclopedia), which was considered outdated and criticised for reflecting the official ideology of the period when it was produced (1962-1970). It surpasses the its predecessor in size, with 140 thousand entries in 30 volumes plus a supplement and is now the largest Polish "traditional" encyclopedia ever written.
The Polish Wikipedia exceeded the Great PWN Encyclopedia's number of articles on 22 October 2005.