Matthew Fox (born 1940) is an American priest and theologian. Formerly a member of the Dominican Order within the Roman Catholic Church, he is now a member of the Episcopal Church. Fox was an early and influential exponent of a movement that came to be known as Creation Spirituality. The movement draws inspiration from the mystical philosophies of such medieval Catholic visionaries as Hildegard of Bingen, Thomas Aquinas, Saint Francis of Assisi, Julian of Norwich, Dante Alighieri, Meister Eckhart and Nicholas of Cusa, as well as the wisdom traditions of Christian scriptures. Creation Spirituality is also strongly aligned with ecological and environmental movements of the late 20th century and embraces numerous spiritual traditions around the world, including Buddhism, Judaism, Sufism, and Native American spirituality, with a focus on "deep ecumenism".
Fox has written 30 books that have sold millions of copies and by the mid 1990s had attracted a "huge and diverse following". He was likened by academic theologians in one New York Times article to the controversial and influential 20th century Jesuit priest, philosopher and paleontologist Pierre Teilhard de Chardin, particularly for his interpretations of issues such as the doctrine of original sin and the Cosmic Christ and for the resulting conflicts with church authorities.