Although the link between self-esteem and psychopathology has been well established, studies on self-esteem in individuals with autism spectrum disorder are lacking. In this study, we aimed to (1) compare explicit and implicit self-esteem of youth with autism spectrum disorder to typically developing peers and to (2) explore relationships of implicit-, explicit-, and discrepant self-esteem measures with co-occurring internalizing and externalizing problems in youth with autism spectrum disorder. For this purpose, 25 individuals with autism spectrum disorder and 24 individuals as age and intelligence quotient--matched controls aged 8-16 years participated in this study. Results showed lower explicit self-esteem in autism spectrum disorder compared to typically developing youth and no differences in implicit self-esteem between groups. In youth with autism spectrum disorder, low explicit self-esteem was related to co-occurring depression symptoms, whereas lower implicit self-esteem was related to externalizing symptoms. These results show that youth with autism spectrum disorder are at risk for developing low explicit self-esteem, which appears to be related to often co-occurring internalizing symptoms. This emphasizes the need to focus more on self-esteem in assessment and treatment of youth with autism spectrum disorder.