Background: Elevated serum concentrations of testosterone is common in women with polycystic ovary syndrome (PCOS)but it'srelationto body mass in dex(BMI), isstillunknown. Objective: The present study was conducted to investigate the relationship between testosterone level and body massindexin womenwith polycysticovary syndrome. Methods: A total of eighty PCOS women with average age 27.6±0.7 and BMI 31.9±0.5 were compared with twenty-two healthy women considered as a control group (age 28.2±1.1, BMI 28.8±1.0). Patients and controls were grouped according to (BMI: Lean, overweight and obese. Allwomen in both groups were subjected to the following investigations: evaluation of luteinizing hormone (LH), follicle stimulating hormone (FSH.), prolactin (PRL), testosterone levels and ultrasonography. Results: The serum levels of LH, LH/FSH and testosterone were significantly higher (P< 0.05) in PCOS compared to control women,while in FSH and PRL the difference was non significant. Obese women with PCOS also had a significantly higher (P<0.05) mean level of testosterone (1.33±0.28ng/ml) compared to lean and overweight patients (0.53±0.17, 0.61±0.08 ng/ml respectively). Uitrasound examination was performed in the ovulatory phase during (12-14) days of the cycle in both PCOS patients and controls, and all women with PCOS with evidence of polycystic ovaries on ultrasonography. Conclusion: Testosterone levelwas significantly elevated in obesecompared to overweightand lean women with PCOS.The role of weight reduction is more beneficial in the management of PCOS and improvementoftestosteronelevel.