Genetic research can help advance our knowledge of autism and positively impact the progress of care for individuals with autism. Asian American and Pacific Islander (AAPI) and Black participants remain significantly underrepresented in genetic research in autism in the United States, including nationwide, multisite, genetic consortiums like Simons Foundation Powering Autism Research for Knowledge (SPARK). Few studies have explored the unique motivators and barriers that influence participation in genetics research across underrepresented groups with autism and strategies to increase participation. Therefore, the aim of this study was to understand the perspectives of AAPI and Black parents of individuals with autism about participating in genetic research, specifically motivators (e.g., desire to know more about the relationship between autism and genetics) and/or barriers (e.g., mistrust of research staff) that may impact their decision to participate in genetic research. Using a mixed-methods approach, we collected surveys (n = 134) across the United States and conducted three focus groups with parents of individuals with autism (n = 16) who identified as AAPI and Black from two large metropolitan cities. No significant differences were observed in the survey data but findings from the focus groups elucidate shared motivators for participation (e.g., to help advance the autism field for future generations) and nuanced differences in barriers that influence Black and AAPI parents decision to participate (e.g., different beliefs about the source of autism). Practical suggestions to improve outreach and study engagement in genetic research in autism were identified and discussed.