This volume explores the concepts of legal power and legal competence in fourteen original, cutting-edge chapters by leading legal theorists. Legal power and legal competence are major topics in jurisprudence, as they concern a range of practices, common to all modern legal systems, that empower individuals to bring about changes in the respective system by changing their own legal position or the legal positions of others. This compilation covers five broad themes. The chapters in the first section address open questions on the meaning of legal power and legal competence, while those in the second tackle problems regarding their normativity. The third section is devoted to specifically exploring the relationship between legal power and constitutive norms. The fourth focuses on the analysis of legal officials and legal offices, while the fifth and final section assesses various theories of legal power and legal competence.