The purpose of this study is to investigate whether the time spent on viewing television and using computer is associated with overweight and obesity among 11- to 14-y-old Turkish secondary school students'. This study was carried out in 5th, 6th and 7th grades of two secondary schools in Zonguldak province in 2016. A total of 476 students, 52.3% (n = 249) female and 47.7% (n = 227) male, between the ages of 10 and 13 and continuing to secondary school, participated in the study. The data of the study were collected with the "Personal Information Form" and body mass index (BMI) measurements were made with the bioelectric impedance analyzer system. According to the results of current study; 20% of secondary school students were found to be overweight and extremely overweight. Extremely overweight children used computers for >2 hours a weekday is 1.55 times, watched TV is 1.67 times higher than normal children. Although the frequency of overweight is higher in female secondary school students than in male, overweight or obesity in both genders is a serious threat to health.