Ossoliński National Institute (Polish: Zakład Narodowy im. Ossolińskich, ZNiO), or the Ossolineum is a Polish cultural foundation, publishing house, archival institute and a research centre of national significance founded in 1817. Located in the city of Wrocław since 1947, it is the second largest institution of its kind in Poland after the ancient Jagiellonian Library in Kraków. Its publishing arm is the oldest continuous imprint in Polish since the early 19th century. It bears the name of its founder, Polish nobleman, Count Józef Maksymilian Ossoliński (1748-1826).