Anxiety is common in children on the autism spectrum, however its impacts are not fully understood. Participation is an important outcome, linked to the health and wellbeing of children. This study examined the relationship between anxiety and participation using parent reports for 131 children on the autism spectrum, aged 6-13 years. Hierarchical multiple regressions explored child and family factors in relation to participation in Home and Community settings. Anxiety was a unique, significant predictor of the frequency of children's participation (but not involvement in activities) in both settings, when controlling for autism characteristics, communication skills and family income. Anxiety symptomatology may contribute to the less frequent participation of children on the autism spectrum in home and community activities.