Ossoliński National Institute, or the Ossolineum is a Polish cultural foundation, publishing house, archival institute and a research centre of national significance founded in 1817 in Lwów. 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).

Lviv is the largest city in western Ukraine, as well as the sixth-largest city in Ukraine, with a population of 717,273. It serves as the administrative centre of Lviv Oblast and Lviv Raion, and is one of the main cultural centres of Ukraine. Lviv also hosts the administration of Lviv urban hromada. It was named after Leo I of Galicia, the eldest son of Daniel, King of Ruthenia.