Józef Andrzej Załuski was a Polish Catholic priest, Bishop of Kiev, a sponsor of learning and culture, and a renowned bibliophile. A member of the Polish nobility (szlachta), bearing the hereditary Junosza coat-of-arms, he is most famous as co-founder of the Załuski Library, one of the largest 18th-century book collections in the world.

The Załuski Library established in Warsaw in 1747 by Józef Andrzej Załuski and his brother, Andrzej Stanisław Załuski, both Roman Catholic bishops, was a public library nationalized and renamed upon its founders' death into the Załuski Library of the Republic which existed until the final demise of Polish-Lithuanian Commonwealth in the Third Partition of Poland in 1795.