Aims: Childhood obesity has been defined as a very serious public health issue. It was aimed toinvestigate the relationship between computer game addiction and obesity in 3rd and 4th gradeelementary school students. Methods: In this cross-sectional study, two separate questionnaires including demographiccharacteristics, physical activity, nutrition and computer game habits were applied to studentsand their parents. The students were also asked to fill the Computer Game Addiction Scale. Results: This study included 491 children and parents. Above the half (51.5%) were female and69% were at normal weight. The body mass index (BMI) percentile values of children in the8-9-year-old group were higher than those in the 10-11-year-old group (t=3.044; p=0.002).When children’s computer game addiction was evaluated, it was found that while 86.9% ofthem were at low level of addiction, 12.7% were at moderate level of addiction. Having anoverweight brother/sister, high paternal BMI, increase in time spent on screen, and lowmaternal education status increased BMI percentile values in children (p<0.05). As long asthe time of playing computer game increased, it was observed that BMI percentile values alsoincreased significantly (p=0.033).Conclusions: This study shows that the level of computer game addiction and the time spenton screen are factors that increase obesity. In addition, the high level of frequency of snack inchildren is supportive of this result. If the ways to fight obesity are to promote physical activityand to move away from sedentary life style in children, it is clear that measures should be takenregarding the time that they spend in front of the screen.