This paper, analysing the relevant provisions of international treaties, acts of the European Union, domestic regulations, as well as examples from the practice of the European Court of Human Rights and domestic courts, seeks to present the role of the child's right to express his/ her opinion, initially in the procedure in which he/she is involved or is concerning him/her, and then in all other areas of his/her life. The right of the child to express his opinion today is one of the most important rights of the child, since its realization allows the child to be heard, that is, to express his wishes, needs, ideas and visions. Given that it represents the child's right and not an obligation (General Comment No. 12 of the Committee on the Rights of the Child), the child decides whether he/she wants to be heard and if so, in what way. Once the child is heard, his/her opinion should be respected according to his/her age and maturity. Despite the fact that today it represents a generally accepted standard of the international community, the right of the child to express an opinion is still often neglected, but also accompanied by certain obstacles in its realization