Anxiety is commonly experienced by children on the autism spectrum, and can negatively impact their lives. Family accommodation has been linked to the impact of anxiety on the child’s life in non-autistic children. This study tested whether the same relationship holds for children on the autism spectrum. A community sample (n = 118) of parents of children on the spectrum completed questionnaires on their child’s autism characteristics and severity and impact of their child’s anxiety, their own anxiety and family accommodation behaviours. Family accommodation was associated with the impact of child anxiety, over and above anxiety severity of the child and parent. Findings support the involvement of parents in psychosocial support for children on the autism spectrum experiencing anxiety.