Background: This systematic review aimed to explore how adults with autism participate in the community, the impact of community participation on quality of life and mental health, and factors that support and hinder participation. Method: A systematic review was conducted including studies published from inception to 17 January 2021. Results: Sixty-three reports were included, reporting on 58 studies. Solitary activities, organised group activities, community activities, religious groups and online social participation were identified. The relationship between community participation and quality of life was examined. Barriers and facilitators to increased community participation were identified. Most studies had a moderate to high risk of bias. Conclusion: Adults with autism participate in a range of independent and community activities. The impact of community participation on quality of life and mental health warrants further exploration. Future studies should find effective ways of supporting adults with autism to participate in the community.