thumb|National Library of Poland, entrance B
Poland's National Library (), also known as the National Library in Warsaw, is a central repository of books and newspapers of Poland founded in 1928. It is directly subordinate to the Polish Ministry of Culture and has the right to receive a copy of every book printed in Poland by a Polish publisher. It collects books and magazines published in Poland and is one of the most important libraries in Poland. It is located in the Polish capital of Warsaw. Library holds 8.2 million volumes in its collection.

160,000 volumes were printed before 1801, and over 26,000 handwritings.

The National Library of Poland was created by a presidential decree of February 24, 1928, but its tradition dates back to the Załuski Library created in 18th century in the Polish-Lithuanian Commonwealth. Its first director was Stefan Demby^{(in Polish)} (1862–1939).