Christiana Drummond Morgan (born Christiana Drummond Councilman; October 6, 1897 – March 14, 1967) was a lay psychologist, artist, and co-director of the renowned Harvard Psychological Clinic. She is best known for co-authoring the Thematic Apperception Test, one of the most widely used projective psychological tests. Morgan played a crucial yet often overlooked role in the development of 20th-century psychology, particularly through her collaboration with Carl Jung and her pioneering work in Jungian and feminist psychology. Her contributions gained renewed recognition with Claire Douglas’s 1993 biography, "Translate This Darkness," and subsequent scholarly interest.