Introduction: The increasing interest of adolescents in internet usage has heightened the risk of internet addiction. Self-control, a crucial internal factor, has been the focus of our study. We aimed to investigate the relationship between self-control and internet addiction. Methods: Using a correlational design with a cross-sectional approach, we surveyed 165 senior high school students selected through cluster sampling. Self-control was the independent variable, and internet addiction was the dependent variable. Data collection involved questionnaires, including the Internet Addiction Test and Self-control Scale, followed by the Spearman Rho test analysis. Results: We discovered a significant relationship between self-control and internet addiction (p = 0.0001; r = -0.456). Conclusion: Our findings underscore that higher levels of self-control are linked to lower instances of internet addiction. This suggests that fostering self-control among adolescents is a practical and effective strategy for preventing internet addiction.