The Bollingen Foundation was an educational foundation set up along the lines of a university press in 1945. It was named for Bollingen Tower, Carl Jung's country home in Bollingen, Switzerland. Funding was provided by Paul Mellon and his wife Mary Conover Mellon. The Foundation became inactive in 1968.
Initially the foundation was dedicated to the dissemination of Jung's work, which was a particular interest of Mary Conover Mellon. The Bollingen Series of books that it sponsored now includes more than 250 related volumes. The Bollingen Foundation also awarded more than 300 fellowships. These fellowships were an important, continuing source of funding for poets like Alexis Leger and Marianne Moore, scientists like Károly Kerényi and artists like Isamu Noguchi, among many others. The Foundation also sponsored the A. W. Mellon lectures at the National Gallery of Art.
In 1948, the foundation donated $10,000 to the Library of Congress to be used toward a $1,000 Bollingen Prize for the best poetry each year. The Library of Congress fellows, who in that year included T. S. Eliot, W. H. Auden and Conrad Aiken, gave the 1949 prize to Ezra Pound for his 1948 Pisan Cantos. Their choice was highly controversial, in particular because of Pound's fascist and anti-Semitic politics. Following the publication of two highly negative articles by Robert Hillyer in the Saturday Review of Literature, the United States Congress passed a resolution that effectively discontinued the involvement of the Library of Congress with the prize. The remaining funds were returned to the Foundation. In 1950, the Bollingen Prize was continued under the auspices of the Yale University Library, which awarded the 1950 prize to Wallace Stevens.