Autism spectrum disorders affect as many as 1 out of 88 children and are related to significant impairment in social, adaptive, and school functioning. Co-occurring conditions, such as anxiety, are common and may cause substantial distress and impairment beyond that caused by the autism diagnosis. Accordingly, we are proposing a randomized controlled trial to examine the effectiveness of a form of cognitive-behavioral therapy relative to treatment as usual (TAU) in 50 youth ages 6-12 with autism spectrum disorders and comorbid anxiety.