Parents of autistic children have historically reported hardships related to raising their children. However, the access to resources related to the childrearing of an autistic child is not equitable, therefore resulting in exacerbated difficulties for parents in low-resource settings. In these situations, peer support may be a protective factor for parental resilience in which they receive various supports from other parents of an autistic child with similar experiences. Despite its potential utility, little is known about such parent-to-parent support as evidenced by no synthesis of relevant literature. To address this gap, we present a scoping review of 25 studies that included parent-to-parent support among parents of autistic children. Across these studies, a total of 141 and 747 parents participated as parent mentors and mentees with some heterogeneity in their demographic characteristics. We also identified how parent mentors were trained to provide support to their peers and social validity data related to parent-to-parent support and provided implications for future intervention research.