The penitentiary system, whose chief goal is to correct individuals convicted for crimes and offences, has got no clear ethical regulations. It also has got no form of ethical guidelines which would apply to persons who professionally come in contact with the penitentiary system: doctors, teachers, legal advisers, priests, etc. The author seeks to reconstruct – on the basis of the prevalent legal system – the list of the moral values which bind a representative of the penitentiary system. It appears that, despite the lack of direct ethical regulations, the list of moral values of significance in the rehabilitation of convicts is relatively easy to establish, rather extensive and coherent.