Due to the importance of the knowledge of mothers on the level of family and children's mental health the present study designed to assess the knowledge of 336 married women regarding severe and mild mental disorders in Haftoon region of Esfahan through a questionnaire developed specifically for this study. Subjects were selected through systematic random sampling method from among married women aged between 20 to 45 years old. They were either illiterate or had the least reading ability and belonged to the low socioeconomic class and lived within the catchment area of a community oriented medical center. Data were analyzed by descriptive statistics and correlation coefficient. Results showed that the mothers were more familiar with the symptoms of severe mental disorders than with the symptoms of mild disorders. The findings also showed that with the increase in the level of education, the knowledge about the symptoms of mental disorders also increased.