Given the high prevalence of polycystic ovary syndrome (PCOS), and that a lifestyle is recognized effective in development of many diseases, this study aimed to compare lifestyle of women with PCOS and healthy women. Nor are there sufficient studies on the difference between lifestyle of these people with that of healthy people. Furthermore, studies show that changes in lifestyle improve this disease. This descriptive-comparative study was conducted on 65 women with PCOS and 65 healthy women of 18 to 45 years old who presented to hospitals affiliated to Shahid Beheshti University of Medical Sciences in 2013. The subjects were selected using multi stage random sampling method. The data were collected using questionnaires for diet, International Physical Activity Questionnaire, and unhealthy behaviors and were analyzed in SPSS v. 17, using descriptive statistics, Man-Whitney, independent t, Chi-square and logistic regression tests. The results showed there was a significant relationship between PCOS and inappropriate diet (p=0.009), low physical activity (p=0.009), but no relationship was observed between PCOS and unhealthy behaviors. Given the results obtained, training and awareness raising is necessary for women and girls especially about appropriate diet and regular physical activity.