The ENS Class 1 Topical Meeting on “Research Facilities for the Future of Nuclear Energy” provided an international scientific and technical forum for a broad review, at world level, of the large research facilities, dedicated for tests for nuclear energy production, which are existing, under construction, or planned for the future. The research facilities covered during the conference are those supporting R&D programmes related to the operation of nuclear reactor power plants and the development of new concepts in the areas of material testing, nuclear data measurements, code validation, fuel cycle, reprocessing, and waste disposal.The conference was relevant to a wide range of people such as the operators and managers of research facilities, research organizations that depend on the facilities for results, young professionals who will shape future requirements, nuclear utilities, vendors (fuel, components), service and engineering companies, designers, plant operators, waste management agencies, licensing authorities, and the decision makers.