Introduction: Urinary incontinence is one of the most common problems among women that has significant effects on various aspects of their lives. The aim of this study was to investigate the prevalence of urinary incontinence and risk factors in women aged 40-60 years referred to urology clinics affiliated to Shahid Sadoughi University in Yazd City in 2010-2011. Methods: This cross-sectional study performed on 200 randomly selected women aged 40-60 years referred to urology clinics. Questionnaire containing demographic information and questions related to determining urinary incontinence and type of urinary incontinence and risk factors (age, weight, height, BMI, age of onset of menopause, age of onset of menopause, number of deliveries, age at first delivery, number of vaginal deliveries, number Cesarean delivery, menopause, diabetes, hypertension, constipation, chronic lung disease, use of contraceptive hormones, postmenopausal hormone therapy, smoking, obsession) were completed by face-to-face interviews. Data were analyzed by SPSS16 software using Chi-square and t-test. Results: The prevalence of urinary incontinence in women aged 40-60 years referred to these clinics was 54%. The highest prevalence was stress urinary incontinence with 89.2%, followed by urge (48.6%) and mixed incontinence (47.7%), respectively. In the study of risk factors, a significant relationship was observed between taking birth control pills and urinary incontinence (P=0.032), constipation and stress and urgency urinary incontinence (P=0.046); there was also a significant relationship between taking birth control pills and not having mixed urinary incontinence (P=0.02). Conclusion: The prevalence of urinary incontinence in women referred to urology clinics is high and in order to reduce the incidence of urinary incontinence, diet change is recommended.