Warsaw University Library (Polish: Biblioteka Uniwersytecka w Warszawie, BUW) is a library of the University of Warsaw, Poland.
The library was founded in 1816, linguist Samuel Linde became its first director. The library initially housed mostly theological and historical books, the collection was however enlarged by papers from other scientific fields in 1825. In 1831 the library, which served as a public library at that time, already housed 134,000 volumes of books, stored in Kazimierzowski Palace
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The website, in Polish, is .