This Yearbook summarises the 2015 research activities of the FinnFusion Consortium that was established in 2014. The present emphasis of the FinnFusion programme is the following: (i) Technology R&D for ITER construction and systems including industry contracts; (ii) Implementation of the "Fusion Roadmap to the Realization of Fusion Energy" as a member of the EUROfusion Consortium with projects focusing on tokamak experiments and modelling; (iii) Creating concepts for the next generation fusion power plant DEMO in Europe. The members of FinnFusion are VTT Technical Research Centre of Finland Ltd., Aalto University, Fortum Corporation (new member in 2015), Lappeenranta University of Technology, Tampere University of Technology, Universit...