Background: Addiction to the internet has become a social and public health issue, particularly among teenagers and adults. The study aimed to evaluate the effect of cognitive behavior therapy to control the internet addiction among nursing institute students in Beni-Suef University. A quasi experimental research design was used. The setting and sample: 40 students of the first year at nursing institute in Beni-Suef University who were diagnosed with internet addiction were included in the study. Tools: data were collected using an interviewing questionnaire composed of four parts; Part I: demographic data and pattern of internet use, Part II: Internet Addiction Diagnostic Questionnaire, Part III: negative consequences associated with internet addiction' questionnaire, Part IV: knowledge' questionnaire about internet addiction. The results; the present study findings indicated that after implementing the cognitive behavior therapy, the mean score of internet addiction among the studied sample was significantly decreased from 6.1±0.8 to 3.1±.1.2 (P=.00001). The results also added that the mean score of negative consequences was significantly decreased (P<0.05). Conclusion: The present study findings showed that the cognitive behavior therapy had significant impact on reducing the mean score of internet addiction and mean hours of internet use among nursing institute students, and was an effective strategy to reduce the negative consequences. Recommendations: Further studies aimed at improving students' awareness of internet addiction, and empowering them with the knowledge and skills they need to successfully avoid this problem.