The Secret of the Golden Flower () is a Chinese Taoist book on neidan (inner alchemy) meditation, which also mixes Buddhist teachings with some Confucian thoughts. It was written by means of the spirit-writing (fuji) technique, through two groups, in 1688 and 1692. After publication of the translation by Richard Wilhelm, with commentary by Carl Gustav Jung, it became modernly popularized among Westerners as a Chinese "religious classic", and is read in psychological circles for analytical and transpersonal psychology considerations of Taoist meditations, although it received little attention in the East.