This study focused on married women in Sabatia division of Vihiga District. It had the main goal of investigating their levels of awareness and knowledge of AIDS as well as examining their H1V/AIDS preventive behaviour. This was in view of understanding their role and capability in influencing marital sexual behavior related to HIV/AIDS prevention. The main objectives of the study included; investigating knowledge among married women concerning HIV transmission and prevention; examining their attitudes concerning personal vulnerability and the preventive strategies they have adopted; exploring their capacity to influence marital sexual behavior related to AIDS prevention as well as the male perspectives on women's role in sexual decision making and AIDS prevention; and identifying factors that promote or hindermarried women's ability to influence marital sexual behavior in HIV/AIDS prevention. This study employed a combination of both quantitative and qualitative techniques. Qualitative techniques used included Focus Group Discussion, informal interviews, key informants and observation. Quantitative techniques included use of questionaires and interview schedules which included both written and unwritten questions. Data processing and analysis were quantitatively and qualitatively applied.