The Perennial Philosophy is a comparative study of mysticism by the British writer and novelist Aldous Huxley. Its title derives from the theological tradition of perennial philosophy.
The Perennial Philosophy was first published in 1945 immediately after the Second World War by Harper & Brothers in the United States (1946 by Chatto & Windus in the United Kingdom). The jacket text of the British first edition explains:
The book offers readers, who are assumed to be familiar with the Christian religion and the Bible, a fresh approach employing Eastern and Western mysticism:
The final paragraph of the jacket text states: