This study investigated the occurrence, causes, and effects of cyberbullying among students at public secondary schools in Marinduque province. A descriptive correlational design was employed, surveying students across all grade levels who had experienced cyberbullying. A self-made questionnaire, based on relevant legal frameworks and literature, was used. The questionnaire comprised three sections: fifteen questions on cyberbullying occurrence, and subsequent sections exploring causes and effects across physical, emotional/psychological, academic, and social aspects. Data collection utilized printed questionnaires. Descriptive statistics (weighted mean using a 5-point Likert scale) were used to determine the occurrence, causes, and effects of cyberbullying. Non-parametric tests (Mann-Whitney U and Kruskal-Wallis) assessed significant differences. Spearman’s rho tested for significant relationships. Results indicated a rare occurrence and low severity of cyberbullying. Significant differences existed between male and female respondents’ perceptions of social and school-related cyberbullying factors, with females exhibiting higher assessments. Furthermore, positive correlations were found between cyberbullying occurrence and its academic and social effects, suggesting that increased cyberbullying is associated with greater academic challenges (e.g., decreased performance) and social disruptions.