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Objective: The aim of the study is to evaluate the nomophobia which is determined as fear of being without access to cell phone, among high school students. Methods: This cross-sectional study was done on December 21st, 2018 in Besiktas at an Anatolian High School with the ethical committee and administrative approvals. In this study, the minimum sample size was 268 among 878 students, and 307 have been reached. Every grade in the school accepted as a stratum. Participants were chosen due to the population of each stratum. The survey was including 29 question, which contains a nomophobia scale valid in Turkish, and seven multiple-choice, two open-ended ques-tions were used. Chi-square test and multiple linear regression analysis were done for data analysis and p [Anadolu Psikiyatri Derg 2020; 21(2.000): 133-140]