This publication records the work carried out under the Coordinated Research Project (CRP) on Labelling Techniques of Biomolecules for Targeted Radiotherapy. Researchers from 15 laboratories in Asia, Europe and Latin America participated in the CRP, which aimed at developing and optimizing existing procedures for radiolabelling of monoclonal antibodies and small peptides with therapeutic radionuclides, such as Y-90 and Re-188. This publication will be of interest to scientists worldwide who are working on the development of therapeutic radiopharmaceuticals.