Öz
The issue of horizontal effect of constitutional fundamental rights, as the matter of whether fundamental rights can constitute a source of rights or obligations in private law relationships or whether fundamental rights arising from public law are being applicable to private law relationships, is not unique to EU law, but has been familiar in the national legal systems under the terms “constitutionalisation of private law” or reversely “privatisation of fundamental rights”. The horizontal effect of the Charter of the Fundamental Rights of the EU is examined in the article from the aspects of horizontal direct effect, horizontal indirect effect and positive obligations. The article addresses the opinions in the literature regarding pros and cons of horizontal effect. Differentiation between rights and principles in the Charter, ratione materiae and personae scope of the application of the Charter, mandatory and unconditional nature of its provisions have been scrutinised as elements of the horizontal direct effect of the Charter. The article argues that whereas all provisions of the Charter, irrespective of being categorised as rights or principles under the meaning of Article 52(5) of the Charter, have horizontal indirect effect, its certain provisions which are both mandatory and unconditional in nature, i.e. having erga omnes effect and not needing to be given more concrete expression by the provisions of EU or national law, have horizontal diret effect.