Background:Considering the important role of education and the benefits of peer education in increasing patients' independence in self-care, as well as the socio-economic benefit of using peer education, the present study was conducted to assess the effect of peer education on the quality of life (QOL) of elderly people with diabetes.Materials and Methods:This clinical trial was conducted with 44 diabetic people aged over 65 years in selected health centers of Isfahan, Iran, in 2014. After preparing the peer group, 8 educational sessions were held for the participants of the groups by their peers (intervention group) and by the researcher (control group). The Diabetes Quality-of-Life (DQOL) measure was used to assess their QOL before, immediately after, and 1 month after the intervention.Results:The difference between the groups in terms of the total quality of life score immediately after the intervention was significant (t = 8.63; p = 0.001). The results showed that the QOL score in the dimensions of worries about diabetes effects (t = 12.13, p = 0.042), impact of diabetes treatment, (t = 8.63, p = 0.001), and satisfaction with diabetes treatment (t = 11.33, p = 0.001) was significantly different in the groups immediately after the intervention.Conclusions:Peer education increased the QOL of patients with diabetes, with significantly better results than the researcher training group immediately after the training. Thus, this method can be used to improve the QOL of the aged population.