Families of autistic children from underserved populations participate in support services at lower rates than other families. To better understand possible reasons for this inequity, we reviewed qualitative studies examining parent-reported barriers and facilitators to accessing and participating in support services. A systematic search identified 18 articles that met inclusion criteria. Resulting thematic analysis located three themes: (a) support service accessibility, (b) diversity of support services, and (c) community. Parents reported that financial pressures, geographic location, and service flexibility influenced their ability to obtain support services. Implications for service delivery and areas for future research are discussed.