This study aims to investigate factors that influence male partner involvement in eliminating mother-to-child HIV transmission in Makueni County, Kenya. Male involvement is currently low, at 0.2% testing rate in antenatal clinics. The study will employ a mixed-methods design using questionnaires, focus groups, and key informant interviews to assess male involvement levels, how involvement influences elimination of transmission, and barriers/opportunities. Data will be collected from October 2022 to December 2022, analyzed from January 2023 to March 2023, and the thesis submitted by July 2023. Ethics approval will be obtained and informed consent, confidentiality, and participants' right to withdraw will be ensured. The budget is KSh 410