Constance Cumbey (born February 29, 1944) is a lawyer and activist Christian author.

Cumbey offered the first major criticism of the New Age movement from a Christian perspective in The Hidden Dangers of the Rainbow: The New Age Movement and Our Coming Age of Barbarism (1983), but quickly lost academic credibility due to her promotion of conspiracy theories linking the New Age movement to Benjamin Creme, theosophy and Nazism. Scholar of New Age religion James R. Lewis describes this book as containing "a few few insightful criticisms with many accusations of the least responsible sort", and that she is "simply lumping together anything that departs from a rather strict interpretation of Christianity." Cumbey's accusations include that the New Age movement has "infiltrated all of Christianity, as well as Judaism", and that it is the motivating force behind ecumenism, holistic health centers, New Thought, humanistic psychology, Montessori schools, modernism, secular humanism, and zero population growth. She states that Unitarian churches and health food stores become "New Age recruiting centers", that the Guardian Angels become one of the New Age movement's paramilitary organizations and that "the New Age Movement has complete identity with the programs of Hitler". Her contention is that the New Age movement is not simply expressing a naive or unscriptural interest in metaphysics, but that it is an organized conspiracy overthrow the United States and replace it with a Nazi-like regime.