Recent research has highlighted leaders as a source of inspiration for followers in sport, providing leaders embed, embody, and represent the group’s values (i.e., the leader demonstrates identity leadership and creates a shared identity). Consequently, two studies (one cross-sectional and one longitudinal) aimed to examine the relationship between identity leadership and follower inspiration via the mediating roles of group identification and trust in the leader. In Study 1, 233 participants completed measures of identity leadership, group identification, trust in their leader, and follower inspiration in a cross-sectional design. In Study 2, 121 participants completed the same measures at two time points (towards the start and end of the season). Cross sectional findings (Study 1) indicated that group identification and trust serially mediated the positive association between identity leadership principles and follower inspiration. Whereas, in Study 2, identity advancement and identity impresarioship at the start of the season predicted follower inspiration at the end of the season through trust in the leader but not through group identification. Taken together, the findings add weight to the importance of identity leadership by not only suggesting that followers of leaders who engage in identity leadership are more inspired but, also, by highlighting important mechanisms (group identification and particularly trust) that may explain these processes.