The Third European Workshop on Nanophotonics for Solar Energy will be held at Berlin on 07-08 October 2020. The workshop is organized by researchers from Helmholtz-Zentrum Berlin für Energie und Materialien and Zuse Institute Berlin, within the framework of the Berlin Joint Lab for Optical Simulations for Energy Research (BerOSE). Current trends and developments in the field of nanostructures for solar energy applications will be discussed. Further, future opportunities and possibilities for collaboration will be explored. The workshop will be organized as part of Photonic Days Berlin Brandenburg 2020.