Autistic students are a growing subgroup within post-secondary schooling; however, little is known about barriers to their success in that context. Research suggests autistic students face more challenges to completing post-secondary education than neurotypical students, but findings often rely on expert opinion and fail to incorporate first-hand perspectives. To address this gap, a qualitative inquiry into barriers to success for autistic post-secondary students was conducted. Thematic Analysis yielded 10 themes in three categories, while two separate cross-cutting themes emerged; themes interact with one another, intensifying concerns of autistic students. Findings can support post-secondary institutions to reflect on the extent to which these barriers are present for their autistic students and modify support services accordingly.