The aim of this study was to investigate the social media addiction of high school students in terms of some variables such as age, class, type of school, gender and daily average internet usage period. Survey method was used in the study. “Social Media Addiction Scale” (SMAS) developed by Tutgun-Unal and “Personal Information Form” prepared by the researcher were used as data collection tools. The data were obtained from a total of 596 students studying in three high schools with different academic achievement level in Kirsehir in Turkey. No significant difference was found in terms of gender variable. When the total scores of high school students on Social Media Addiction Scale are examined, it is determined that the students have “low level of addiction”. In addition, it was found that there was a significant relationship between high school students' daily average internet usage time and social media addiction.