Abstract   The aim of the study was to determine the prevelance of internet addiction and effected factors in primary school students. This school-based study was a cross-sectional descriptive research design. This study was conducted with 277 students. Prevelans of IA among students was found 10.5%. Variables such as age (≥11 years), internet use in a day (≥3 h), not use internet for education, homework, research, use internet for communication, social network, gaming and mid academic grade accounted for 23% of the internet addiction. It is recommended that children with risk factors for internet addiction should be determined in the early stages, and that school-based intervention programs should be performed for students and their parents to prevent internet addiction.