Introduction: Internet addiction is an increasing problem among adolescents worldwide. The Internet provides
educational advantages, but internet over use can lead to negative outcomes such as social isolation and poor academic
achievement. This study aimed to assess the prevalence of “Internet Addiction (IA)" among adolescents in Mansoura
city, Egypt. A cross-sectional study design was used to accomplish this study. Multi stages stratified cluster-sampling
technique was done of 2340 students located at Mansoura city. Data for this study was collected by using Fahmy and El-
Sherbini Socio Economic Scale and Internet Addiction Scale. Results: The study results revealed that. 44.7% of the
adolescents had moderate internet addiction, 12% had severe internet addictions and 43.3% of the adolescents were
average Internet users. Most adolescents (96.9%) preferred home to access the internet. Social media was the main
purpose of using the internet as reported by 81.5% of the adolescents. Most of them (89%) utilized mobile phones for
internet access. Conclusion: Moderate and sever IA was prevalent among more than half of studied adolescents. Most
adolescents used internet for entertainment purposes. Finally, it is recommended conduct health education program about
safe internet usage and the importance of sports and social activities.