The ocean and its inhabitants sketch and stretch our understandings of law in unexpected ways. Inspired by the blue turn in the social sciences and humanities, Blue Legalities explores how regulatory frameworks and governmental infrastructures are made, reworked, and contested in the oceans. Its interdisciplinary contributors analyze topics that range from militarization and Maori cosmologies to island building in the South China Sea and underwater robotics. Throughout, Blue Legalities illuminates the vast and unusual challenges associated with regulating the turbulent materialities and lives of the sea. Offering much more than an analysis of legal frameworks, the chapters in this volume show how the more-than-human ocean is central to the construction of terrestrial institutions and modes of governance. By thinking with the more-than-human ocean, Blue Legalities questions what we think we know--and what we don't know--about oceans, our earthly planet, and ourselves.