The National Institutes of Health (NIH) is offering a funding opportunity for research on Autism Spectrum Disorders (ASD) through the R21 Clinical Trial Optional grant mechanism. This initiative aims to support exploratory and innovative research that elucidates the etiology, epidemiology, diagnosis, and optimal service delivery related to ASD, encouraging applications that do not require preliminary data. The program is crucial for advancing understanding and improving services for individuals with ASD, with grants available up to $275,000 for a two-year period, contingent on the quality of applications and available funds. Interested applicants must submit their proposals by November 16, 2024, and can reach out to the NIH OER Webmaster at FBOWebmaster@OD.NIH.GOV for further inquiries.