The study examined the subjective experiences of autistic youth regarding the role of peer interactions and relationships in feelings of belonging in integrated physical education classes. The term integrated is used to describe a setting in which all students, regardless of educational needs, are educated in the same physical space. Eight autistic youth (all male, aged 13–18 years) who had received most of their physical education in integrated classes acted as participants. Semi-structured interviews were used to generate qualitative data, which were analyzed using a reflexive thematic approach. Findings are presented in three themes: (a) bullying can lead to self-harm and self-isolation, (b) peer interactions and relationships in the locker room, and (c) peer relationships are based on shared interests and take time to develop. Even though autistic students were educated in the same spaces as their non-autistic peers, feelings of belonging were largely unavailable to them. Lay abstract Recent years have seen calls to amplify the voices of autistic people in research about their subjective experiences. Despite this, we know little about how autistic youth experience integrated physical education, particularly in the United States. The term integrated is used to describe a setting in which all students, regardless of educational needs, are educated in the same physical space. In this study, we sought to explore the perspectives of autistic youth toward their experiences in integrated physical education, and the roles of social interactions and relationships with peers in those experiences. Findings noted that several factors influenced the ways and extent to which our participants interacted with their peers during physical education. Unfortunately, most of our participants recalled experiencing bullying, and that physical education offered an environment where bullying was most frequent and comparatively unique compared to other contexts throughout the school day. The locker room, a space linked to physical education, was of particular concern because of a lack of teacher presence. Despite the negative views of and experiences in physical education, there was evidence of participants actively pursuing to connect with peers in this context. However, most instances where participants recalled pursuing friendship were not welcomed from others, which stunted their sense of belonging in this space. Given the role that belonging plays in what it means “to be included,” our research supports emerging ideas that even though autistic students were educated in the same physical spaces as their non-autistic peers, feelings of inclusion were largely absent.