The author examines the history of the Scientific Library of Polotsk State University from its establishment till nowadays. For 55 years, the Library has been dynamically developing along with its parent organization: The library of Belorussian Polytechnic Institution Branch (1968), the library of Novopolotsk Polytechnic Institute (1974), the library of the classical university (1993); and since 2005 it has been operating as a scientific library. The contribution of the library leaders and directors is characterized in brief. Today, the Library is housed across three sites, each of them belongs to a particular epoch. The library was first founded in Novopolotsk, and today the administration, information resources development department, lending, reading and exhibition rooms, conference hall, and Polotsk land education and science museum, are located here. The library branch in Polotsk is located in the restored historical building of Jesuist collegium (1580), once the largest educational library. The library branch in Mezhdurechye settlement is a new, comfortable and modern environment and a new type of library. As a whole, the library today is a n educational, research and cultural center; it provides access to information resources, supports and facilitates the university’s educational research and professional work.