Research objective: This research aims to identify the effectiveness of the mastery learning strategy supported electronically on learning some volleyball skills for middle school students. Methodology used: Experimental Research sample and its characteristics: The research sample consists of the second-grade students of the preparatory stage at Bani Amer Preparatory School for the academic year 2021/2022 AD, and their number is (30) students divided into two groups, one experimental and consisting of (15) students, and the other control and consisting of (15) students. Key findings: - The application of the educational program using the mastery learning strategy supported electronically has a statistically significant effect on the level of learning of some volleyball skills and the level of cognitive achievement under investigation. - The e-supported mastery learning strategy has proven effective in reducing the burden on teachers, in addition to its positive and effective role in stimulating and revitalizing learners.