Project INTERprofessional Autism Collaborative Training (INTERACT) is an interprofessional education program designed to prepare graduate students in psychology, special education, and speech-language pathology to work with autistic children with moderate to severe intellectual disabilities. The rising prevalence of autism, coupled with increased appreciation for interprofessional approaches to service delivery, indicates the need for university training programs to prepare graduate students to work interprofessionally with this population; yet descriptions of such programs and their effectiveness are not reported in the literature. In this article, we explain the process through which an interprofessional faculty team developed Project INTERACT, describe the sequence of coursework and team-based clinical experiences that comprise the program, and present preliminary data regarding its effectiveness. Twenty-four graduate students in psychology, special education, and speech-language pathology participated in this quantitative study. We report results from three rating scales that participants completed at program entry, midpoint, and program exit. Participants endorsed positive attitudes toward interprofessional practice and demonstrated high levels of knowledge about autism. Self-rated knowledge and abilities in interprofessional practice increased significantly by program exit. Project INTERACT scholars developed knowledge and skills related to understanding, assessing, and treating autistic children with intellectual disabilities, through the lens of team-based interprofessional collaboration. We discuss implications for practice with Project INTERACT.