A prototype is an ongoing, cognitive representation of common attributes and distinct characteristics that define an object or person. This mixed-method study applies the robust concept of prototype to examine perceptions of disability groups. Core, secondary, and tertiary prototype characteristics are described for six disabilities: schizophrenia, mental retardation, attention-deficit/hyperactivity disorder, spinal cord injury, visual impairment, and hearing impairment. Similarities and differences among disability group prototypes are identified. The potential relationship between prototypes, attitudes, and subsequent judgment biases is explored. Examining prototypes might be an effective method for indirectly measuring attitudes toward disability groups. Implications for rehabilitation counseling practice and education are discussed.