Postural stability is a fundamental aspect of motor ability that allows individuals to sustain and maintain the desired physical position of one's body. The present study examined postural stability in average-IQ adolescents and adults with Autism Spectrum Disorder (ASD). Twenty-six individuals with ASD and 26 age-and-IQ-matched individuals with typical development stood on one leg or two legs with eyes opened or closed on a Wii balance board. Results indicated significant group differences in postural stability during one-legged standing, but there were no significant group differences during two-legged standing. This suggests that static balance during more complex standing postures is impaired in average-IQ individuals with ASD. Further, current ASD symptoms were related to postural stability during two-legged standing in individuals with ASD. Future directions and clinical implications are discussed.