Introduction: Online games addiction has been shown to cause changes to one’s emotion and behaviour. Moreover, academic performance could be affected too. Therefore, this study aims to assess the relationship between game addiction, psychosocial effects and academic performance of undergraduate students in University of Cyberjaya (UoC). Methods: A cross sectional study was conducted among undergraduate students of University of Cyberjaya (UoC), Cyberjaya, Selangor from 4 different faculties. Respondents were selected through a random sampling method and data has been collected through online form using validated questionnaires. Results: Overall prevalence of online games addiction was high among the age group of 20-24 years old (18.26%), Other ethnicity group (44.45%), and among male students (35.72%). Data analysed using chi square in this study has shown an association between online games addiction and psychosocial effects (p-value = <0.001) but no association between online games addiction and academic performance (p-value = 0.850). Conclusion: Students who were addicted to online games have been related to having psychosocial effects but association between gaming addiction and academic performance was not being carried out in this study. This might be due to other factors including level of intelligence and time spent on studying. We recommend that awareness campaigns on the influence of online gaming should be strengthened as a measure to reduce the prevalence of online games addiction and counselling to be given for those with early symptoms of psychosocial effects regardless of being addicted or not.