Masturbation is a relatively neglected topic in research.Therefore the purpose of the study was to assess knowledge and attitude of married women regarding masturbation risks SETTING: The out-patient clinic in Obstetric and Gynecological department at Benha university hospital DESIGN:A descriptive research design was utilized. SAMPLING:AConvenient sample of married women, total number is 334 women. Instruments: two instruments were utilized for data collection, Astructured- interviewing questionnaire sheet for knowledge about masturbation and its risks and a modified Likert scale for attitude of married women regarding masturbation risks. RESULTS: indicates that there was a highly positive association between the studied women total knowledge score and attitude scores (p < 0.001).CONCLUSION: : the majority of studied women had poor knowledge about masturbation and its risks and nearly three quarters of them had negative attitude regarding masturbation and its risks.. RECOMMENDATION:provide educational program including married women for arising the awareness of masturbation and its risks