Objective: In our study, it was aimed to determine the relationship between risky internet usage and healthy lifestyle behaviors in medical faculty students.Material and Methods: Three hundred and nineteen students participated in this cross-sectional study conducted at Dumlupinar University Medical Faculty between 1 March and 30 March 2017. Sociodemographic information form, Internet Addiction Scale (IAS) and Healthy Life Style Behavior Scale (HLSBS) were used for data collection. Those whose scored over 50 from the IAS were defined as "Risky Internet Users" (RIU). Descriptive data and percentages were evaluated by Chi square and mean variables were evaluated by t-test.Results: Of the students, 42.3%(n=135) were male and the mean age was 20.8±2.1 (range 18-27). While RIU prevalence was found to be 24.7%, this ratio was determined to be higher for males (p=0.000) and for those who were not satisfied with their department. The frequency of RIU was found to increase when mother education level got higher (p=0.001) and as the duration of internet usage increased (p=0.000). The prevalence of RIU was lower in those who used internet for educational purposes (p=0.004). HLSBS score average was found to be lower in students with RIU (p=0.001). The group with RIU was determined to get lower scores in the subgroups of the scale such as interpersonel relations (p=0.000), physical activity (p=0.009) and stress management (p=0.008).Conclusion: In our study, it was determined that in young people, RIU was higher in males and was affected by different sociodemographic factors. While inexistence of an internet addicted student was pleasing, guidance services on RIU and healthy life style behaviors will be beneficial.