You are invited to join the 3rd free Massive Open Online Course (MOOC) on Marine Litter developed by the United Nations Environment Programme, in cooperation with the Open University of the Netherlands. The MOOC was created to stimulate leadership and offers opportunities for actionable and change-oriented learning related to marine litter within the framework of the Global Partnership on Marine Litter. The MOOC will start on 29 April 2019 with the Leadership Track taking place over two weeks. The MOOC is available in all English, French, Arabic, Russian, Chinese, Spanish and Portuguese. Participants who wish to remain in the course will continue to the Expert Track, which will be completed by August (total of eight weeks). This track is available in English and Spanish.