Background: Social support has been described as a vital resource for families with children with disability. Although the benefits of social support have been described, little is known about the utilisation patterns in families of young children with autism spectrum disorder (ASD). Method: In a community sample of 78 American families with children (2-6 years) with ASD, this study examined the utilisation and usefulness of social support. Child, family, and service variables related to social support were explored. Results: Mothers of children with ASD reported using a combination of formal and informal supports, and these were perceived to be helpful. Sociodemographic variables, child behaviour problems, satisfaction with the autism diagnostic process, and access to information about ASD predicted social support utilisation. Conclusion: Social support utilisation varies as a function of different child, family, and service variables. Understanding these variables may help professionals guide families in access to and use of social support.