As a candidate country Turkey is affected strongly by the legal and economic changes in European Union. After the Association Agreement introductions of the Act on the Protection of Competition and Turkish Competition Agency Turkish Competition Law has been affected by European Union approach. The private actions remedy has also been placed in Turkish Law. But the position of European Commission decisions as administrative decisions on the breaches of Competition Law has not been clarified. This book is focusing on the appropriateness of European Commission decisions before Turkish Courts in the cases related with the private actions remedy. It analyses the situation of Competition Law in Turkey and European Union. Related legislations judiciary and administrative approaches of both sides are being reviewed in this thesis. Beside the Competition Law Civil Law and Civil Procedure Law of Turkey has been reviewed where they are relevant with main question. Reflections of comparative research and possible outcome of current situation has been explainedç