In October 2008, the Marine environment protection committee (MEPC) of the International Maritime Organization (IMO) adopted revisions to the international regulations for the prevention of Air pollution from ships (MARPOL Annex VI). The revised regulations included a requirement that, from 1 January 2020, the sulphur content of fuel oil used by ships operating outside designated emission control areas shall not exceed 0.50% by mass, known as “IMO 2020”. Reducing emissions of sulphur oxides will bring significant global benefits for human health and the environment. IMO 2020 will have a major impact worldwide. To support its successful implementation by the international shipping sector, this publication brings together all the instruments and guidance prepared into one document for easy reference, including IMO resolutions and circulars.