Civil disobedience and conscientious objection are distinct but related social practices that display people’s opposition to specific laws, policies, directives, or schemes. In general, these two practices arise from people’s deeply held commitments. Civil disobedience is more overtly communicative and political than conscientious objection. Civil disobedience is also, almost by definition, a breach of law, which people engage in to push for changes in either governmental or nongovernmental practices. Conscientious objection, by contrast, does not always break the law: sometimes it is a legally protected form of nonconformity. It is also less overtly political than civil disobedience, stemming as it does from people’s desire not to participate in practices they oppose, rather than from their ambition to change those practices. Both practices can be morally justified under specific conditions that, among other things, include doing only limited harm to other people. Moreover, under even more specific conditions, both practices could be said to be protected by moral rights. Civil disobedience and conscientious objection generate pressing normative and political challenges concerning the nature of the rule of law, respect for the rule of law, conditions for deliberative democracy, equality before the law, policing, adjudication, and punishment.