Legal Certainty

Legal certainty is considered in the paper not only as one of the general principles of law and one of the requirements of the Rule of Law, but also as a fundamental feature and condition of the significance of law and its instrumental value in general. In this regard, the definitions of the Rule of Law conception and the lists of its components proposed by Western philosophers and theorists of law and by the Venice Commission are analyzed. Elements of the principle of legal certainty such as legislation and case law accessibility, legal acts’ predictability, principles of case law unity, legitimate expectations, res judicata, the European concept of autonomous interpretation and the American doctrine of uncertainty of law are covered. By analyzing and synthesizing theoretical concepts of the principle of legal certainty, the practice of its interpretation and application by European and national courts, the connections between it and other general principles of law (in particular – principles of legality and reasonableness), this principle plays a key role in the Rule of Law implementation in the national legal system.