Mycosis fungoides (MF) is an extranodal non-Hodgkin's lymphoma with primary involvement of the skin. The aim of the present study was to determine the incidence rate of MF in Isfahan (Iran) and to compare the results with other reports. We collected our data from the MF clinic of Alzahra Hospital which is the main center for treatment of MF patients in Isfahan (2007-2008). Eleven cases were reported to the MF clinic of Alzahra during the study, seven of which were diagnosed as MF. The incidence rate of MF in Isfahan in 2007-2008 was 3.91/1 million persons. The age spectrum was 28-80 years and the mean 43.14 years. The male : female ratio was 3:4. In conclusion, the incidence rate of MF in Isfahan (Iran) is similar to other areas. However, the male : female ratio is opposite to that of other studies.