The aim of the study includes whether the relationship between the fear of missing out and social media addictions due to the use of social media during the COVID-19 process of undergraduate students at the university differs significantly according to the variables of gender, age, faculty, duration of social media use and social media use purposes. In this study, which is based on the relational scanning model, the sample group consisted of 589 undergraduate students studying at various universities in Turkey in the 2020-2021 academic semesters, and data were collected through an online questionnaire. From data collection tools; The Fear of Missing out Scale (SSDS) adapted to Turkish by Aydın, Ünal, and Metintaş (2016) and the Social Media Addiction Scale-Adult Form (SMBÖ-YF) developed by Şahin and Yağcı (2017) were applied. In data analysis; "T-test", "Spearman Correlation", "Mann-Whitney U", "Kruskal-Wallis H" and "Tamhane's T2" tests and descriptive statistical analysis were used. As a result of the findings, it was determined that there is a positive significant relationship between students' fear of missing out on social media developments and their social media addictions. According to the research findings, conclusions and recommendations were given.