<p>The aim of this study is to measure the nomophobia levels of high school students studying in thecity center of Uşak and to examine the relationship between personality traits and nomophobialevels. The population of the study consists of high school students in Uşak city center, Turkey, whilethe sample group includes 200 high school students selected through a simple random samplingmethod from science high schools, teacher high schools, Anatolian high schools, and vocational highschools. The research was conducted using the survey model, one of the quantitative researchmethods. A personal information form, a nomophobia scale to measure technological addiction, anda ten-item personality scale to assess personality traits were utilized. To analyze the data,independent samples t-tests, parametric one-way analysis of variance (ANOVA), and the Tukey testfor intergroup differences were applied. The findings indicate a statistically significant and inverserelationship between the "losing online connection" sub-dimension of the nomophobia scale (TNS)and both the "extraversion" sub-dimension and the overall score of the ten-item personality scale(TIPS). However, no statistically significant relationships were found for the other sub-dimensionsof the TNS and TIPS. Additionally, no significant associations were identified between the subscalesof the TNS and TIPS or between the overall TIPS score and the subscales of the TNS. The results ofthe study revealed that women exhibited higher levels of nomophobia than men, and that increaseddaily mobile internet and smartphone usage were associated with higher nomophobia levels.Furthermore, individuals who engaged in sports demonstrated higher scores in "agreeableness" and"emotional stability." It was also found that individuals' anxiety about "losing online connection" wasinversely related to extraversion. However, variables such as phone usage duration, years of mobileinternet usage, and time spent with friends during the day did not have a significant effect onpersonality traits or nomophobia levels.</p>