This study employed a newly developed measure, the Social Skills Q-Sort (SSQ), to assess paraprofessionals’ and teachers’ reports of social skills for children with and without ASD. Paraprofessionals and teachers showed good rater-agreement on the SSQ. ROC curve analyses yielded an excellent profile of sensitivity and specificity for discriminating between children with ASD and typically developing children. The paraprofessional SSQ converged with objective ratings of playground social behavior; however, there was little evidence of convergence between SSQ scores and parent and teacher ratings on questionnaire measures. The SSQ may be effective in screening for ASD and the severity of ASD-related social communication challenges.