The study was realized to examine the personality traits and smartphone addiction levels of high school students. The research group consists of totally 239 students, including 139 males and 100 females studying in Sports High School, Anatolian High School and Vocational High School in Sanliurfa during the "2019-2020" academic years. "Smartphone Addiction Scale" and "Five Factor Personality Inventory" were used to obtain data for the purpose of the research. The students participating in the study were asked personal information questions regarding their demographic characteristics. The study was carried out in SPSS 22 statistical package program and the degree of significance was taken as 0.05. Independent Sample T (IndependentSample) and Mann Whitney-Utest in binary comparisons, One-Way Variance Analysis (OneWayAnova) in multiple comparisons and Kruskal Wallis Analysis in non-normally distributed data, and correlation (Pearson) test to determine the relationship between variables. According to the responses given by the students who participated in the study, there was a significant difference between the groups according to the type of school, the state of doing sports, the purpose of using the smartphone, the average grade and the daily usage of the smartphone, while the use of the smartphone and the grade only in the personality characteristics levels. There was a significant difference between the groups in mean variables. According to the results of the correlation analysis, a significant relationship was detected between the personality traits of the students and their smartphone usage levels.