The East Prussian State Museum (OL) is the central collection point for cultural heritage objects from East Prussia and the Baltic States, but its library also houses over 15,000 relevant titles relating to the area.
On the basis of its extensive collections, the East Prussian state museum (OL) preserves, researches and communicates the cultural heritage, history and landscape of East Prussia and the Baltic States, with a focus on the cultural history of the Baltic Germans. Objects from the fields of history, cultural history and natural history are displayed in a number of exhibition areas. One focal point of the collection is art and cultural historical objects from the above-mentioned regions. The OL exhibits precious gold and amber works, but also works of art from the Königsberg Academy of Art and the artists' colony in 

Nida is a small town on the Lithuanian Baltic coast. The city is in the west of the country directly on the border with the Russian oblast Kaliningrad. It is inhabited by just under 2,400 people and is the most western city in Lithuania.

. The museum has several thousand paintings and graphic artworks. In addition, the exhibition also deals with the eventful history of the region up until its decline. The collection includes classical cultural-historical pieces and also some archival pieces from the Middle Ages to the present. The 20th century focal points are, in particular, the two world wars, the crimes of National Socialism and the subsequent flight and expulsion of almost the entire German population, as well as their integration in post-war Germany. A separate section presents the history of the Baltic Germans in their historical settlement areas of 
deu. Livland, est. Liivimaa, lav. Livonija

Livonia (latv. Livonija, est. Liivimaa) is a historical landscape in the Baltic States. Nowadays it includes parts of southern Estonia and northern Latvia. The landscape was named after the Livons who once lived there.

deu. Kurland, lav. Kurzeme

Courland is a historical landscape in the west of Latvia. Courland is situated on the Baltic Sea and borders two other Latvian regions - Livonia and Semgalia - and Lithuania to the south. The major cities of Courland include Jelgava, Ventspils and Liepaja.

, and 
deu. Estland, est. Eestimaa

Estonia is a historical landscape in northeastern Europe and includes the northern part of the present Estonian state. Until 1918, Estonia was one of the three Baltic Sea governorates of the Russian Empire, along with Livonia and Courland.

 from the Middle Ages to the resettlement in 1939.

In addition, the specialized library contains around 15,000 titles on East and 
West Prussia
deu. Westpreußen, pol. Prusy Zachodnie

West Prussia is a historical region in present-day northern Poland. The region fell to Prussia as a result of the first partition of Poland-Lithuania in 1772 and received its name from the province of the same name formed by Frederick II in 1775, which also included parts of the historical landscapes of Greater Poland, Pomerania, Pomesania and Kulmerland. The Prussian province lasted in changing borders until the early 20th century. After World War I, parts fell to the Second Polish Republic, founded in 1918. The largest cities in West Prussia include Gdansk (Polish: Gdańsk, today Pomeranian Voivodeship), Elbląg (Polish: Elbląg, today Warmia-Masuria Voivodeship), and Thorn (Polish: Toruń, today Kujawsko-Pomeranian Voivodeship).

, as well as on the German-Baltic settlement areas and topics relating to the integration of displaced persons after 1945. Biographies, prose and poetry of people from the mentioned regions form an important part of the library. The basic stock for the collection came from the OL’s predecessor institution, the East Prussian Hunting Museum (1958–1986), with holdings related to hunting, forestry, agriculture and horse breeding in East Prussia. The holdings of the Museum Stadt Königsberg in Duisburg, which was dissolved in 2016, also form part of the collection. The library is used by the neighboring Nordostinstitut (IKGN e.V.).