Objective:The aim is to diagnose the ovarian cyst by ultrasound modality and confirmed this by histopathologic results. Methods: Aprospective study on one hundred and fifty female patients in the period of one year (2009) in gyne-and obstetrical out patent clink. Results: The patients examined and (150), ninty of these patient (60%) have ovarian cysts. (48) patient 53%. Their cyst resolved completely while (42) patient 47% are not respond to medical treatment and need surgical interference and these cyst are exposed to the histopathological assessment. Conclusion: Sonography of the pelvic organs to detect ovarian cyst is a good imaging modality, quick and safe procedure, need no much preparation and easily predict the nature and type of the cyst and very easy methods to follow these patients.