Regional Development Agencies aims to provide internal developmentand improve lagging regions by developing regional policies. This situation has increased the importance of competitiveness of regions andTurkey's compliance with the Union's regional policy has become necessaryin European Union accession process.With the accession process to the European Union, Turkey abandonedregional policies, which have already implemented, and it began restructuring.In accordance with the criteria which set for the integrationof all candidate countries, Turkey has shifted to policies that bring theregional competition foreground. For this purpose, firstly it adopted statisticalregions separation system (NUTS) in 2002, in accordance withthe EU adaptation requirements, and then it has agreed to establish theRegional Development Agencies in order to benefit from the financialfunds of the European Union.In this study, first general information about Regional DevelopmentAgencies will be given and regulatory developments taking place in Turkeywill be evaluated. In this context, the relation of legal arrangementswith the EU regional policy and Turkey's harmonization process will bediscussed. In the study, an assessment on to what extent the regionaldevelopment agencies have affected Regional development in Turkey andat what rate regional development agencies have reached their objectivesof establishment will be made by using statistical data.