Background: Academic challenges such as losing/not turning in assignments, misplacing materials, and inefficient studying are common in middle-school students with autism spectrum disorder (ASD) without intellectual disability. Deficits in organization, planning, prioritizing, memory/materials management, and studying skills [i.e. academic executive functioning (EF) deficits] contribute to these challenges. Aims: To assess the feasibility, satisfaction, and initial efficacy of the school-based version of the Achieving Independence and Mastery in School (AIMS) intervention in a proof-of-concept trial with 6 students with ASD. Methods: 6 middle-schoolers with ASD without ID participated in AIMS. Parents and teachers rated academic EFs and functioning. Results: Results suggest high feasibility, youth satisfaction, and improved EF skills and academic behaviors by parent and teacher report. Conclusions: These promising results support further intervention development and suggest that academic EF skills are malleable in students with ASD. [This is the online version of an article published in "International Journal of Developmental Disabilities."]