This paper will assess the definition and the role of the CSDP in the EU cyber defence policies. The focus on cyber defence in the area of CSDP is not meant to render other cyberspace policies of the EU less relevant. Purely for the purpose of this book, the paper focuses on the military aspect of the EU cyber defence. The second part of the paper defines the CSDP, its actors and the EU competence in the field. The third part covers all adopted EU policies related to cybersecurity, with a focus on issues related to the CSDP approach to cyber defence.