Celebrated for their conceptual clarity, titles in the Clarendon Law Series offer concise, accessible overviews of major fields of law and legal thought. This chapter examines the limits of State jurisdiction under international law. It begins by considering the limits of a State's legislative jurisdiction, its jurisdiction to prescribe laws. It covers jurisdiction over territory; maritime jurisdiction; jurisdiction over nationals; protective jurisdiction; universal jurisdiction; and other extra-territorial extensions of jurisdiction. The discussions then turn to treaty-based jurisdiction; competing and conflicting jurisdiction; extradition and legal co-operation; resolving jurisdictional conflicts; and immunities and other limitations on the exercise of a State's jurisdiction.