The aim of this study is to investigate high school students' online game addiction with respect to gender. The sample which was selected through the criterion sampling method, consists of 81 female (61.8%) female, and 50 male (38.2%), total 131 high school students. The "Online Game Addiction Scale" which was developed by Kaya and Basol (2013) and the Biographic-Demographic Information Form were utilized as data collection instruments. Percentage documentation average and independent sample T-test were used for data analysis in this study. The result of this study showed that there is a significant difference between female and male students in terms of the online game addiction subscales of trouble, success and economic profit. [This paper was presented at the International Educational Technology Conference (IETC) (15th, Istanbul, Turkey, 2015).]