"In this paper, I outline the principle of informed consent in Canadian law governing end of life decision-making. I trace the impact of this principle on legal developments in the area of advance directives, medical assistance in dying (MAID), and finally (where the two converge) advance requests in the context of MAID. I show how recognition of the principle of informed consent has not only served to justify developments in the law facilitating advance directives; it has also played an important role in justifying the legalization, under specific circumstances, of voluntary euthanasia and assisted suicide. The paradigmatic case of informed consent is where a clearly competent, fully informed adult, acting on her own behalf, effectively communicates her wishes to her physician, contemporaneously to the administration of treatment. Any deviation from these conditions raises questions about how to apply the principle. I examine the claim that the ascendance of the informed consent principle has eclipsed other principles and come to obscure the role that the professional judgment of physicians plays in the provision of medical treatment. First, I consider this claim in relation to conflicts over the prolongation of so-called futile treatment. Next, I consider the claim in relation to the controversy surrounding access to MAID. Lastly, I explain why the present capacity requirement, barring advance requests for MAID, is justified."