Background: Polycystic ovary syndrome (PCOS) is the most common cause of anovulatory infertility in more than 70% of cases. Objectives: The aim of study was to assess the ovarian and uterine blood flow in women with pcos compared to normal ovulatory fertile women. Patients and methods: This prospective (case control study) was conducted in Ultrasound and Infertility Units in the Department of Obstetrics and Gynecology of Zagazig University Hospitals during the period from September 2018 to June 2019. The patients were classified into 3 groups: Group I (control): include (11 women) ovulatory normal fertile women with regular cycle; Group II (cases): include (11 women) non obese women diagnosed as PCOS patients (according to Rotterdam criteria); and Group III (cases): include (11 women) obese women diagnosed as PCOS patients. Results: The finding of a polycystic ovary on ultrasound in association with either hyperandrogenism or chronic anovulation is considered sufficient to make the diagnosis of PCOS. There was statistically significant increase in uterine PI in PCOS patients than in control women, The ovarian artery PI, RI, S/D ratio were significantly decreased in PCOS than in controls in the early as well as on the late follicular phase. Conclusion: Doppler examination could be useful for the evaluation of PCOS patients, in addition to conventional hormonal and biochemical parameters. Using Doppler TVS increased ovarian vascularity in PCOS patients. The uterine artery Doppler indices can be correlated to obese patients in cases with PCOS.