Small Powers at Sea presents an analysis of the marine policies of Denmark, Norway and Sweden from the First UN Conference on the Law of the Sea in 1958 until the conclusion of the Third UN Conference on the Law of the Sea in 1982. The main substantive chapters cover security aspects, continental shelf policies, fisheries, shipping and marine environment as well as deep seabed mining. The study is comparative and conducted from a political science perspective, discussing how to explain the rather divergent Scandinavian marine policies. A state-centric rational actor model can explain much of the variance, but other factors, including cognitive ones and the role of domestic politics, must be included to obtain a fuller understanding of Scandinavian policies over time and across issue areas.