The subject matter of this publication is the issue of religious freedom of juveniles placed in isolation centres, with particular attention to the competitiveness of the entities that co-shape the decision on the scope of the right to religious practices and services in such centres, i.e., the child themselves, their parents or guardians and the administration of the correctional institution. The paper considers the importance of a child’s religious freedom and their right to self-determination. It goes on to consider the rights of parents or guardians to raise their child in their faith and culture, both in light of Polish and international regulations. This is a particularly momentous problem, especially in the event of incompatibility between the child’s will and the parents’ decision in this regard. On the one hand, the legislator has decided that a child of a certain age is sufficiently aware to be responsible for their actions, while on the other hand, the child cannot yet decide on their own to participate in religion lessons and religious practices and services. Finally, it is attempted in the publication to decode the scope of the authority of the administration of correctional institutions and juvenile correctional centres on the subject of religious freedom of their residents. This is an issue relevant not only to the field of criminal and juvenile law, but also to human rights.