Rehabilitation constitutes one of the most fundamental aims of criminal justice in the light of which the system personality and character of offenders will be rehabilitation and return to the society will be increased. Prison, which at present is one of the most frequently used and widely recognized punishment constitutes the most principal means for achieving this purpose. The reason is that in prison environment various programs are managed and implemented for the correction and treatment of offender among which education of prisoners can be counted as the most important rehabilitative programs. It is in this manner that offenders, in one hand, succeed to obtain one of the most outstanding instances of human rights (right to education) and, on the other, go forward in the direction of normality. Because of the importance of this right, in the sphere of criminal policy of UN a number of binding and proselytizing instruments, education of prisoners has been declared as a part of obligation of states and in some other the policy of education have been recommended. Similarly, in the scope of criminal policy of Iran the right of offenders to rehabilitation and, in this direction, their right to education in the highest level of policy- making has been recognized, in such a manner that it is possible to allege from constitutionalzation, generalization and legalization. In the present- study, in addition to the recognition of rehabilitative aspects of the right of prisoners to education, the approach of the UN criminal policy (A) and criminal policy of Iran (B) in this respect will be analysed.