Rethinking Conscientious Objection in Health Care presents the case against the right of healthcare professionals to refuse delivery of certain healthcare services based on their moral views. It provides philosophical analyses of conscience and freedom of conscience, as well as the arguments and principles typically utilized when arguing in favor of allowing healthcare professionals conscientious objection. The authors criticize those arguments and offer a philosophical and historical analysis of the concept of professionalism, as well as an appeal to the nature of professional obligations, to build their case against the right to conscientious objection in healthcare.