The NEA Annual Report 2019 provides an overview of the status of nuclear power in NEA member countries and illustrative descriptions of the Agency's activities and international joint projects. 2019 was a very active and impactful year at the NEA and in NEA member countries. During this year, the NEA released reports on the system costs of electricity, the supply of medical radioisotopes and the long-term operation of nuclear power reactors. It organised conferences and workshops corresponding to the needs of member countries in the application and exploration of nuclear science and technology, including the Country-Specific Nuclear Safety Culture Forum in Finland and the first Global Forum on Innovation for the Future of Nuclear Energy. The Agency also continued its efforts in enhancing international co-operation with events such as the first Roundtable for International Co-operation in Final Disposal of High-level Radioactive Waste and Spent Fuel.