The thorium based nuclear fuel cycle offers many advantages with respect to safety, reduced proliferation risk and waste management. However, the quality of nuclear data for the relevant materials is lower than that for the comparable materials in uranium or mixed oxide (plutonium) fuel cycles. This publication presents the results of a coordinated research project aiming to improve the database of experimentally measured nuclear data of nuclides appearing in the thorium–uranium fuel cycle. It includes complex and comprehensive evaluated nuclear data files with a broad consensus on quality and validated performance based on benchmark test cases.