Theories and research related to the unconscious can be found in every area of psychology, but there is no course devoted to the topic in the undergraduate curriculum. A capstone course on the unconscious is described. The course integrates topics across the major fields of psychology. Themes in the course include the existence of mental processes that individuals are not aware of, do not have access to, and are not able to control, and how these processes lead to efficiency and confabulation. Course topics related to these themes are organized into subsections including why psychology needs the unconscious, psychodynamic theories, the modern unconscious, and consciousness and free will. Suggestions are made for course readings, assignments, and activities. (Contains 1 table.)