Education directed towards sustainability comes in response to the challenges of our increasingly interconnected planet while its future is at stake. Ocean Literacy (OL), via behavioral change initiatives and a systems approach, aims at connecting Ocean Science and Education for Sustainable Development (ESD). The objective of the BlueMinds4Teachers project was to strengthen the skills of teachers and other educators in OL issues through the collaboration of marine and freshwater scientists, experts from education and social sciences, teachers experienced in implementing blue projects, and young Ocean ambassadors. The objectives were: (a) to bring the inter- and multi-disciplinary approach of Ocean science issues to teachers and other educators enabling them to improve their knowledge on OL issues and integrate them into ESD; (b) to bridge skills and knowledge gaps by integrating science and pedagogy, improve social learning and critical thinking; (c) to design, develop, implement, and assess an interactive online training course to improve skills of teachers and other educators in promoting OL at schools and educational communities; (d) to give the opportunity to meet, learn, discuss, and debate on rules and strategies of marine and maritime research, testing of already available teaching plans and modules, evaluation of possible additions, modifications, weaknesses, and strengths.