Objective: The present study examines the relationship between social media addiction and cyberbullying among adolescents. Method: This descriptive study was conducted with the participation of 1,058 adolescents aged 14 to 17, between September 1, 2018, and January 1, 2019, in the Central Anatolian region of T & uuml;rkiye. Data were collected using the Adolescent Data Collection Form, the Revised Cyber Bullying Inventory II, and the Social Media Disorder Scale for Adolescents - Short Form. Data were evaluated with a Pearson's Chi-square Test, Spearman's Correlation, and Logistic Regression analysis. Results: Of the adolescents in the study group, 23.3% were addicted to social media. Female sex and spending more time on social media increased the risk of the development of a social media addiction. Spending more time on social media increased the risk of becoming a victim of cyberbullying and cyber victimization. A strong and positive relationship was identified between social media addiction among adolescents on the one hand, and cyberbullying and victimization on the other. Conclusion: The more time spent on social media, the greater the risk of development of social media addiction, cyberbullying, and victimization.