Western peer-mediation education has been developed as a citizenship education. In Japan, mediation education has been carried out as ADR attracts a great public attention. However, there are no or little coordination between peer-mediation education and citizenship education. On the other hand, education for youth within their own community, which is a basis for citizenship education, has been called for as a measure dealing with social problems among youth. Therefore, we need to promote peer-mediation education in the framework of citizenship education in cooperation with people in the community. I will examine the potential and challenges for this kind of peer-mediation education from my observation of peer-mediations administered in England and Japan. I found that peer-mediation education in England is supported by and integrated to the mediation programs of community based organizations. Also I found some possibilities in Japan for integrating peer-mediation education to citizenship education based on community activities.