Investigated differences in comorbidity in children ages 8 to 13 (N = 199) with primary diagnoses of generalized anxiety disorder (GAD), separation anxiety disorder (SAD), or social phobia (SP). Children with primary SAD were found to have the highest number of comorbid diagnoses. Specific phobias were more common in children with primary SAD than in those with primary SP, whereas neither group differed from children with primary GAD. Mood disorders were more common in children with GAD or SP than in children with primary SAD. Comorbid externalizing disorders, although present in 17% of the sample, were not found to vary across diagnostic groups. Functional enuresis was most common in children with primary SAD. Results are discussed with respect to diagnostic and treatment issues.