Proclaimed by the United Nations General Assembly in 2017, the Decade of Ocean Science for Sustainable Development (2021—2030) (hereinafter — the Decade) aims to stimulate the develop- ment of ocean science and generate knowledge to stem the trend of deterioration of the ocean ecosys- tem and stimulate the use of new opportunities for its sustainable development in accordance with the paradigm of the Decade: «The science we need for the ocean we want». The Decade of Ocean Sciences provides scientists and stakeholders across sectors with a framework to develop the scientific knowl- edge and partnerships needed to accelerate and harness advances in ocean science to advance under- standing of the ocean system and provide science-based solutions to implement the Agenda Sustainable Development Day 2030. The UN General Assembly instructed the Intergovernmental Oceanographic Commission of UNESCO to coordinate the preparation and implementation of the Decade. The article presents the most important events held since January 2021 by the IOC in the framework of the events of the Decade.