The Bollingen Foundation was an educational foundation set up along the lines of a university press in 1945. It was named after 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, and its publications were later re-issued by Princeton University Press.

The Bollingen Tower is a structure built by Swiss psychiatrist Carl Jung. In appearance, it is a small castle with four towers. It is located in the village of Bollingen on the shore of the Obersee basin of Lake Zürich.