UN Environment and the Open University have created a Massive Open Online Course (MOOC) on Marine Litter. It is part of Clean Seas and contributes to the goals of the Global Partnership on Marine Litter. The MOOC on marine litter strives to teach students through action oriented learning how they can apply successful and inspiring activities to their own local context, regardless of their profession or location. The course will present different options and tools to combat marine pollution such as the use of effective and legitimate tools like the Honolulu Strategy. The course will provide examples and case studies that will inspire leadership at all levels, thereby increasing awareness of and stimulating creative solutions to marine litter problems. Moreover, this course will benefit policymakers, practitioners, and managers who wish to connect with other professionals in order to enhance their knowledge of marine litter issues.