This article outlines a stakeholder-created research agenda to guide future early intervention research for autistic children. We collaborated with 10 autism service providers, 10 parents of individuals with autism, and 10 autistic people across a total of 18 small group and 2 inter-group meetings occurring over 2 years. Together, we synthesized results from (1) these stakeholder workshops and (2) a survey completed by 237 autistic adults, autism providers, caregivers, and autism researchers in the United States. The finalized research agenda includes (1) Guiding Principles, (2) Research Priorities, and (3) Systems Implications. The full version of the early intervention autism research agenda is available in Supplemental Material. In this article, we summarize the main points of the research agenda and discuss unique themes highlighted by stakeholders in considering early autism intervention research. Finally, we highlight the need to include stakeholders in decision-making and consultant positions throughout the research process to align future work most directly and optimally with the goals and needs of the autism community. We have gathered guidance directly from our stakeholders and experiences with Project Stakeholders Engaging in Early Intervention Research (STEER) into a researcher workbook which we hope may facilitate these efforts. This workbook is available in Supplemental Material.