Researchers have proposed that autism spectrum disorder (ASD) is characterized, at least in part, by executive function (EF) difficulties associated with the integrity of the frontal lobe. Given the paucity of research regarding EFs in young adults with high functioning ASD (HF-ASD), this research involves an examination of various indices of EF related to inhibition, planning, and generativity. Results indicate that although young adults with HF-ASD as a group met normative expectations on all measures of EF, they also exhibited considerable individual variability relative to their age- and sex-matched typically developing peers. These findings have important research and clinical implications, including the need to carefully consider the impact of the research comparison group, and to recognize individual variability in executive functioning among young adults with HF-ASD.