Supervision is a specialized area of psychological activity that has its own foundation of knowledge, skills, and attitudes, which are enhanced by training. As our discipline develops its standards for competent practice in supervision, there is a need to develop ethical guidelines to assist both supervisors and supervisees in maintaining productive working relationships. Organized around the hierarchy of ethical principles comprising the Canadian Code of Ethics for Psychologists, the Canadian Psychological Association adopted Ethical Guidelines for Supervision in Psychology: Teaching, Research, Practice, and Administration in early 2009. In this article, each of the four ethical principles (Respect for the Dignity of Persons, Responsible Caring, Integrity in Relationships, and Responsibility to Society) is examined in the context of supervision within the areas of teaching, research, practice, and administration. The history of the guidelines, as well as some of their innovative and unique elements, is also discussed.