With the UN Decade of Ocean Science for Sustainable Development (2021–2030) well underway, the report “Heritage in the UN Decade of Ocean Science for Sustainable Development (2021–2030) and Beyond” demonstrates how Ocean Heritage is an essential pillar for achieving the Ocean Decade goals, preserving the oceans for future generations, and advancing ocean science in a manner that is more ethical, inclusive, and holistic. This document is a call to action for stakeholders—in particular scientists, policymakers, and heritage professionals—to more explicitly integrate cultural heritage into ocean science and policy.