The relations between Turkey and the European Union and the current developments concerning this process are important issues which have direct and indirect effects on the economic, political and social dynamics in Turkey. In this context the European Union has also become an important subject of political debates in Turkey. This thesis analyses the roles and approaches of the political components within the framework of Turkish Social Democratic Movement in the process of the determination of the Turkey-European Union relations. This thesis will provide a chance to conceive how the European Union and the relations between Turkey and the European Union are considered and assessed by Turkish Social Democrats who are one of the most important components of Turkish politics that have also submitted significant contributions to the Turkey-European Union relations.