This study examined worry and the parameters of worry that may be associated with clinical anxiety in a sample of 119 children and adolescents referred to a childhood anxiety disorders specialty clinic. Using an interviewing procedure, results indicated that the types of worries reported by the children were similar to those reported in previous studies of nonreferred community children. Also similar to previous community studies were findings showing moderate but significant correlations between different indices of worry (i.e., number, intensity, and frequency of the worries) and children's scores on self-rating scales of anxiety. Results further indicated that worry contributed additional variance beyond that of anxiety in predicting fear. In addition, intensity differentiated clinic children's worries from nonreferred children's. Intensity and number of worries differentiated subsamples of children within the clinic-referred sample (i.e., children with overanxious disorder or generalized anxiety disorder and children with simple phobia). The importance of examining children's worries to further understand anxiety and its disorders in youth is discussed.