This Study on legal and regulatory barriers for the clean energy transition on Greek islands is the result of a consultative process. Based on an inventory of the current legislation and information gathered via surveys and interviews, the Clean energy for EU islands secretariat has brought together relevant stakeholders to identify barriers to the clean energy transition on Greek islands, and formulated recommendations to overcome them. After an introduction and explanation of the methodology, the first Chapter of this Study provides an overview of the existing policy and legislation for clean energy on Greek islands. The second Chapter contains the identified priority legal and regulatory barriers, based on the survey and the interviews and the recommendations, based on the Focus Group Meetings and in-person National Stakeholder Meeting.