Young people are the back bone of every counter’s future. At the same time, they are the ones that are at greater risk for many risky sexual behaviors. In Ethiopia, despite the significance of the problem, there is little research work in the area of risky sexual behaviors and associated factors among high school students. The objective of this study was to assess risky sexual behaviors and associated factors in high school students in Shashemene and Bulchana Preparatory Schools.