The workshop WOFEX 2020 (PhD workshop of Faculty of Electrical Engineering and Computer Science) was held on September 8 th September 2020 at the VŠB -Technical University of Ostrava. The workshop offers an opportunity for students to meet and share their research experiences, to discover commonalities in research and studentship, and to foster a collaborative environment for joint problem solving. PhD students are encouraged to attend in order to ensure a broad, unconfined discussion. In that view, this workshop is intended for students and researchers of this faculty offering opportunities to meet new colleagues.This book of proceedings includes 83 papers of faculty PhD students and 3 papers of external authors. The proceedings of WOFEX 2020 are also available at the web site http://wofex.vsb.cz/2020/. I would like to thank the authors and the Organizing Committee from Department of Computer Science, namely Jiří Dvorský and Pavel Moravec, for their arduous editing work.