Social participation is one of the most important predictors of the children's physical and mental health. Although it is evidenced that children with autism spectrum disorder (ASD) have restricted social participation, it is unclear which factors play a significant role. This research aimed to uncover perceived barriers of social participation by involving 26 stakeholders including parents of children with ASD, youth with ASD, and clinicians working with individuals with ASD in focus groups and interviews. Using thematic analysis yielded three themes including (a) difficulty understanding social situations; (b) maladaptive behaviours; and (c) conflicting priorities and restricted nature of training. This project was the first study to involve key stakeholders to highlight barriers of social participation among individuals with ASD.