Introduction: Excessive use of internet has led to internet addiction (IA) which is associated with many problems. The present study was conducted to find out potential IA among medical students and its relationship with Insomnia and Self Esteem. Methodology: A study on 150 medical students was conducted in the Department of Physiology, R.G Kar Medical College, Kolkata for 6 months. Three validated questionnaires were used as study tools. Statistical analysis was done using SPSS software(version 20.0). Results: The average YIAT score was 51.76 ± 16.96. ISI score was higher and RSES score were lower in students with potential IA and there was a significant difference in Insomnia score value and RSES score value between IA groups. Significant correlations were found between IA and insomnia (p–value < 0.05). Conclusions: Internet addiction is a potential risk factor for insomnia and low self–esteem among medical students.