This paper discusses the individual book ownership marks used in the Gdańsk Library from the end of the 16th to the beginning of the 21st century. In the first two centuries of existence of the Library of the Council of the City of Gdańsk, three subsequent copperplate bookplates were used as ownership marks. Established in the beginning of the 19th century, the City Library in Gdańsk marked its collections with seals with eight (six pre-war and two post-war) different patterns changed over time; they were imprinted using ink. The founding of the Gdańsk Library of the Polish Academy of Sciences in the mid-20th century resulted in the use of a further seven different seals.
Today, bookplates are no longer used to mark the collections of the Gdańsk Library. However, these ownership marks continue to be made to mark special occasions; some of them are described in this paper.