HUBUNGAN FANATISME DAN ANONIMITAS TERHADAP KECENDERUNGAN PERILAKU CYBERBULLYNG PADA SUPORTER SEPAK BOLA INDONESIA DI PLATFORM INSTAGRAMNIM.: 22107010127Fahrian SyauqiauthorThe enthusiasm of football supporters in showing their support for their favorite teams has contributed to the emergence of cyberbullying behavior. Anonymity and fanaticism are suspected to be predictors of cyberbullying. This study aims to examine the relationship between anonymity and fanaticism with cyberbullying behavior among football supporters on the Instagram social media platform. This research employed a quantitative correlational method. The respondents involved in this study were 144 football supporters active on social media, selected using a nonprobability sampling technique through convenience sampling. Data analysis was conducted using multiple linear regression analysis. The results showed that anonymity and fanaticism were collectively associated with cyberbullying behavior among football supporters, with a simultaneous effective contribution of 12.6%. Partially, anonymity was proven to have a significant relationship with cyberbullying, while fanaticism was not found to have a significant relationship with cyberbullying behavior. The partial contribution of anonymity to cyberbullying was 12.33%. These findings provide theoretical implications that, in understanding cyberbullying behavior among football supporters, it is important to examine the role of anonymity as a contributing factor.150 Psikologi2026-07-24UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS ILMU SOSIAL DAN HUMANIORAThesis