Autistic high school students overwhelmingly have a poor experience of school. Research into this stage of life is limited, and researchers have tended not to talk to autistic students directly, instead hearing from non-autistic observers such as teachers and parents. This study aimed to address this gap in our knowledge by interviewing autistic students in mainstream high schools about their experience of school and their ideas for how this could be improved. Ten autistic students (13 to 20 years old) in Australian high schools were interviewed. Students overwhelmingly reported a negative experience. Most said their ideal school would be one where teachers and peers had greater understanding about autism and teachers had training in autism. By including the student voice, this research makes a valuable contribution to our understanding of autistic students’ school experience, adding depth and detail, and including what they would like to see changed. Importantly, the interview data also challenged misconceptions about what autistic students prioritised. The voice of autistic teens can make an important contribution to policies and practices aimed at improving their experience of school.