This article explores the relevance of the law of international responsibility to the practice of domestic courts. In addition to proposing analytical distinctions that allow us to systematize and differentiate domestic case law pertaining to international responsibility, the article essentially advances three arguments. First, in certain circumstances domestic courts may find that a breach of an international obligation by the forum state constitutes an internationally wrongful act. Principles of international responsibility may be applicable to such a wrong. Second, domestic courts may contribute to the implementation of the international responsibility of states by ensuring that principles of cessation and reparation are given effect. Third, international law leaves much leeway to states and their courts in applying principles of international responsibility in a specific domestic legal and factual context. The application of such principles will be colored by their interaction with domestic law and will vary among states.