Autism spectrum disorder (ASD) is characterized by marked impairments in social and non-social cognitive ability that persist well into adulthood and contribute to significant functional disability. The treatment of ASD has focused almost exclusively on children, and few empirically supported interventions are available to address the core cognitive and functional challenges individuals with ASD face as they transition to adulthood. This study will investigate and contrast the effects of two psychological treatments for adults with autism spectrum disorder. Cognitive Enhancement Therapy (CET) is a cognitive remediation intervention that aims to help adults with problems in thinking, planning, and socialization. Enriched Supportive Therapy (EST) is an individual supportive therapy that aims to help adults learn about their condition, manage their emotions and stress, improve their social skills, and cope with everyday problems.