Background: Electronic sexual harassment (ESH) is a controversial issue causing physical, social as well as psychosocial negative effects on preparatory students which consequently can deteriorate their academic achievements. Aim: Evaluate the effect of educational intervention on preventive measures against electronic sexual harassment among preparatory students. Design: A quasi-experimental design [pretest -posttest] was utilized. Setting: Three preparatory schools randomly selected by multistage cluster sampling from the two educational administrations of Zagazig City. Sample: A random sample of 150 students was recruited. Tools: It used four tools, Tool one A self-administered questionnaire composed of two parts, demographic characteristics of the participated students and data regarding the participants' daily use of the internet, Tool two Students’ Knowledge Regarding ESH, Tool three Students’ Preventive Measures and Protection Practices Toward ESH, Tool four about Sexual Harassment Coping Behaviors Subscale. Results: Revealed that the mean age of the students was 8.8158±2.38254, and about 68.00% of them were females, 15.9% had good knowledge before the educational program, the percentage improved to 78.2% after the educational program, the total preventive measures and protection practices toward electronic sexual harassment scores increased from 32.5% at the pre phase to 80.9% after the educational program, the percent of the total scores regarding coping behaviors against electronic sexual harassment increased from 24.1 % at the pre-phase to 75.9 % after the educational program. Conclusion: Doing the educational program for students was effective in enhancing their knowledge and preventive measures about electronic sexual harassment and also improving their coping behaviors against sexual harassment. Recommendations: Implementing the developed program in comparable settings on a broader scale to approve its beneficial effects and allow the findings to be more broadly applied.