The Ocean Observing Co-Design Programme aims to transform our ocean observing system design process through user-focussed co-design. It will develop tools that will allow sponsors to ask key questions about cost and benefit and receive clear answers, and all stakeholders will benefit from knowledge, products and services being delivered more effectively. The Ocean Observing Co-Design Programme will host an online Ocean Decade Co-Design Workshop on June 7, 8 and 9 to kick-start the development of transformative co-design processes and to shape plans for advancing co-design projects. Teams will work on the development of co-design ‘exemplar’ projects, for example around providing the ocean information needed to national governments for carbon budgets, users of marine heatwave information, and improving the forecasting of hurricanes and tropical storms.