The overall goal of Stay Healthy: A Gender-Transformative HIV Prevention Curriculum for Youth in Namibia is to prevent HIV infection among Namibian youth aged 13-18. Stay Healthy focuses on changing three key behaviors directly related to HIV infection by accomplishing the following: (1) delaying the onset of sexual intercourse, (2) increasing the correct and consistent use of the male condom among sexually active youth, and (3) decreasing multiple concurrent partners among sexually active youth. The reasons why some Namibian youth engage in these behaviors while others do not were identified through a careful analysis using the Behavior-Determinant-Intervention Logic Model. These reasons, or determinants, are the focus of all learning activities in Stay Healthy.Stay Healthy is a highly interactive curriculum comprised of 18 45-minute sessions (a total of 13.5 hours). Sessions were designed to be completed in 45 minutes to accommodate the typical class schedule in Namibian schools.