This study on Supporting Nuclear Data for Advanced MOX Fuels was performed in the framework of the specific programme on Nuclear Fission Safety of the Framework Programme for the European Atomic Energy Community (1994-1998), under contract number F141 CT 95 0002, by BELGONUCLEAIRE, SCK.CEN, ECN (now NRG), CEA, ITU and ENEA under the co-ordination of BELGONUCLEAIRE (Mr. S. Pilate). It supports the larger study entitled Evaluation of Possible Partitioning and Transmutation Strategies and of Means for Implementing them performed in parallel under Contract number F141-CT95-0006, which includes scenarios of actinide recycling in thermal reactors (PWRs) and fast reactors. This final report is subdivided into 3 chapters: A. Evaluation of MOX Fuel Irradiations in Thermal Reactors B. Evaluation of MOX Fuel Irradiations in Fast Reactors C. Evaluations of Fundamental Data Files.