Background: Nutrition promotion and education intervention using web sites are an accessible and effective tool in developing healthy nutrition-related practice and dietary habits in secondary school students. Aim of the Study: Was to examine the effect of web based nutritional health education intervention for secondary schools' students. Design: A Quasi-experimental research design was utilized. Setting: The study was conducted in 3 secondary schools affiliated to Benha Educational Administration. Sampling: A simple random sampling technique was used to select 130 students who were in second grade secondary. Tools: I: Structured Interview Questionnaire which divided into: a: Personal characteristics, measuring weight, height and BMI. b: students' knowledge. c: reported practices. II: Attitude of secondary school students regarding nutrition. Results: revealed that, 67.7% of the study group had poor level of total knowledge about nutrition at pre intervention. While, 87.7% had good level of total knowledge about nutrition at post intervention. 24.6% of the study group had satisfactory level of total reported practice regarding dietary habits at pre intervention, which increased to, 89.2% had satisfactory level of total reported practices regarding dietary habits at post intervention. 43.1% of the study group had positive attitude regarding healthy nutrition at pre intervention. While, 92.3% had positive attitude regarding healthy nutrition at post intervention. Conclusion: The web based nutritional health education intervention improved knowledge, practice and attitude for study group than control group. There was a high correlation between total students' knowledge, reported practices and attitude regarding healthy nutrition among the study group at pre- and post-intervention. Recommendation: Apply the web based interventions of nutrition on a large scale, large sample and students in other age groups.