This study aims to examine the role of life satisfaction as a moderator in the relationship between social media engagement and FOMO. The participants of this study consisted of 407 young adults aged 18 to 35 years who have and are active in using social media using an accidental sampling technique. This research is a quantitative research with a Moderation Regression Analysis (MRA) data analysis method using SPSS and JASP. The measuring instruments used in this study were the Social Media Engagement (SME) questionnaire, Satisfaction With Life Scales (SWLS), and the Fear of Missing Out Scales (FoMOS). The results showed that there was a significant and positive relationship between social media engagement and FOMO. Life satisfaction as a moderator variable itself can not moderate the relationship between social media engagement and FOMO.