Background and Purpose One of the key pillars of the football industry is its fans, who are considered the most important stakeholders, as their presence makes this industry unique and sets it apart from others (Gutierrez, 2019). Sports fans are individuals who have strong emotional connections to their team, athlete, or favorite sport (Kim et al., 2020). This psychological bond between fans and a sports team or athlete is referred to as team identity (Theodorakis et al., 2016). It is important to recognize that team identity is not fixed,it is flexible and can change over time (Delia, 2019). The concept of threats to team identity is a relatively new area of research in sports management, which has recently garnered increasing attention from scholars studying sports consumer behavior. In this context, the present study aims to identify the factors that pose a threat to the team identity of football fans. Methodology Given that identity threats trigger deep psychological processes (Mansfield et al., 2020) and considering the lack of comprehensive research on the threat to football fans' team identity, a qualitative research method was deemed suitable for this study. The research was conducted using content analysis, which is recognized as one of the most effective methods in qualitative research (Braun & Clarke, 2006). The study's statistical population comprised the fans of the Esteghlal Tehran football team who followed the team's official Instagram page. The sampling method used was purposive, where a call for participation was made from April 4 to September 12, 1400, in the comments section of all posts on the official Instagram page of the Esteghlal team...