This report has been prepared by the OECD upon request by the Portuguese Independent Commission for Decentralisation. Decentralisation and regionalisation reforms have recently emerged on the Portugal's policy agenda, with two main objectives: assigning more tasks to municipalities and strengthening regional level governance. The report presents a diagnosis of Portugal multi-level governance in international perspectives and highlights the strengths and challenges of the system. It then presents three potential policy paths of regional reform for Portugal. As the options are not mutually exclusive, they could work as complements to each other. The report analyses the conditions under which the reforms may deliver more economic efficiency and regional equity