Background: Parenting self-efficacy, described as the beliefs parents hold about their ability to successfully parent their children, has been shown to support parent and child well-being. Parents of children with autism spectrum disorder face disproportionately high levels of demand both as caregivers, and as partners in multiple, complex, intervention programs. This study examines the relationship between parents' experiences with their child's interventions—specifically their sense of involvement in treatment and satisfaction with intervention-related training—and their confidence in parenting a child with autism spectrum disorder, defined as autism-specific parenting self-efficacy. Methods: Participants (N = 438, 93% mothers of children with autism spectrum disorder aged 2–17 years) completed our novel autism-specific parenting self-efficacy scale and rated their experience of involvement in their child's interventions and satisfaction with intervention-related training across a range of common autism spectrum disorder–related treatments. Respondents also completed a caregiver burden scale. Results: Findings indicate that parents who report greater involvement in their child's interventions, and note greater satisfaction with intervention-related training, also report greater autism-specific parenting self-efficacy. Parents who report greater financial and social burden report lower autism-specific parenting self-efficacy. Conclusions: We propose that these results are important in creating intervention experiences that foster parental self-efficacy through involvement, productive training experiences, and addressing parental burden.