Imposter Phenomenon (IP) is feelings of inadequacy and inauthenticity in settings where achievement is emphasized and valued. This exploratory study employs a survey to investigate the prevalence and underlying factors of IP among Master of Public Administration (MPA) students at seven US universities with varying institutional characteristics. The results show that over 1 in 10 MPA students report experiencing IP and feeling excluded by their peers and faculty. Our findings show that feelings of belongingness are negatively associated with experiences of IP. These findings contribute to the growing scholarship that emphasizes the role of oppressive systems in feelings of belonging and inadequacy. This article offers insight to better support MPA students in navigating their studies in the context of oppressive social systems. By understanding IP's dynamics and the role of belonging in the context of PA education, this study hopes to foster a more inclusive academic environment.