Aim: This study aims to determine the levels of cyberbullying sensitivity and internet addiction among high school students. Methods: The sample of this descriptive study consists of 729 students. The study implemented data collection tools, such as “Introductory Features of Students Questionnaire Form,” “Young’s Internet Addiction Test,” and “Cyberbullying Sensitivity Scale.” The analysis of the data was completed by transferring the data to the IBM SPSS Statistics 23 program. Results: As a result of analysis, Young's Internet Addiction Test mean score was found to be 26.57 ± 8.85, while the average score of Cyberbullying Sensitivity Scale was 31.00 ± 6.43. According to some introductory features of students, a statistically significant difference was found between Young’s Internet Addiction Test and Cyberbullying Sensitivity Scale (p < 0.05). Conclusion: While the internet addiction level of participants was found to be low, their sensitivity to cyberbullying was found to be high. In an effort to deal with cyberbullying, educational programs and counseling services on internet addiction and cyber sensitivity need to be organized in schools involving parents of school children.