Children with autism spectrum disorder (ASD) are often not included in social interactions. This is mainly because non-autistic people frequently misunderstand them and because of this do not...Show moreChildren with autism spectrum disorder (ASD) are often not included in social interactions. This is mainly because non-autistic people frequently misunderstand them and because of this do not accept, or even reject and dismiss them (Cage et al., 2018). This can make social participation for children with ASD unpleasant and stressful, even though social participation is vital for their development (Eisenberg et al., 1998; Kawachi & Berkman, 2001). To date, only a few studies have examined the impact of limited access to school participation on the psychosocial development of school-aged children with ASD. Furthermore, one may wonder whether certain factors, e.g., individual, family, or school factors, could influence the relation between social participation and psychosocial functioning in children with ASD. To address this gap of knowledge, this study examined the relation between social participation and psychosocial functioning of Dutch children with ASD aged between 4 and 16 years. Furthermore, this study explored whether and to what extent children’s individual characteristics such as IQ, their family characteristics such as parent self-efficacy, and the school characteristics, such as the social environment of the school, could moderate this relation. Two hundred parents of children with ASD from different areas of the Netherlands filled in questionnaires to report about their children’s socioemotional development through the online platform NAR (Dutch Autism Register). The results showed that the more children with ASD participated in social interactions, the fewer psychosocial problems they had. Higher parent self-efficacy predicted fewer psychosocial problems in children with ASD. However, no moderating effects were found. The current study highlights the importance of promoting social participation at school for children with ASD. It also highlights the importance of providing support to the parents of children with ASD and increasing these parents’ self-confidence in supporting their child with ASD.Show less