Illustrating the legacy of Brexit, this timely Research Handbook provides a comprehensive and coherent analysis of not only the Brexit process within the UK but also what it means for both the UK and the EU within the framework of their future relationship. Bringing together contributions from leading scholars in the field, this Research Handbook considers the ways in which the legal, economic and political uncertainty brought about by Brexit through the upheaval of established norms and values will continue to reverberate for the remainder of the 2020s and beyond. Divided into four parts, it focuses on different aspects of the Brexit process and the EU-UK future relationship, including Brexit's impact on the political system of the United Kingdom, repatriation of laws and competences and a post-Brexit framework. Above all, it argues that Brexit creates both new challenges and new opportunities for the UK but also for the process of EU integration. The Research Handbook on Legal Aspects of Brexit will be crucial reading for researchers and students in the fields of constitutional and administrative law, European law and politics looking to enhance their understanding of the impact that Brexit will have for both the UK and the EU.