This publication provides a foundation for filling information and data gap on trade in oceans-based sectors with the aim of facilitating its sustainable development within and across borders. The publication sets forth a Sustainable Oceans Economy classification for tradable goods and services, which can be used by all countries at any point in time. Moreover, it has been conceptualized with consideration for its application for the design of coherent policies, the assessment of oceans sustainability pillars, and the comprehensive analysis of value chains of oceans-based sectors (goods and services).