The article addresses issues at the nexus of physician industrial action, moral agency, and responsibility. There are situations in which we find ourselves best placed to offer aid to those who may be in vulnerable positions, a behavior that is consistent with our everyday moral intuitions. In both our interpersonal relationships and social life, we make frequent judgments about whether to praise or blame someone for their actions when we determine that they should have acted to help a vulnerable person. (...) While the average person is unlikely to confront these kinds of situations often, those in the medical professions, physicians especially, may confront these and similar situations regularly. Therefore, when physicians withhold their services for whatever reason in support of industrial action, it raises issues of moral responsibility to patients who may be in a vulnerable position. Using theories of moral responsibility, vulnerability, and ethics, this paper explores the moral implications of physician industrial action. We explore issues of vulnerability of patients, as well as the moral responsibility and moral agency of doctors to patients. Determining when a person is vulnerable, and when an individual becomes a moral agent, worthy of praise or blame for an act or non-action, is at the core of the framework. Notwithstanding the right of physicians to act in their self-interest, we argue that vulnerability leads to moral obligations, that physicians are moral agents, and the imperatives of their obligations to patients clear, even if limited by certain conditions. We suggest that both doctors and governments have a collective responsibility to prevent harm to patients and present the theoretical and practical implications of the paper. (shrink)