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Lay Abstract: Insomnia, trouble falling asleep or staying asleep, is common in autistic children. In a previous report, we described the results of focus groups with parents of autistic children toward the development of the Pediatric Autism Insomnia Rating Scale. In this article, we report on the steps taken to complete the Pediatric Autism Insomnia Rating Scale. With help from the Simons Foundation registry, we collected information from parents on 1185 children with autism spectrum disorder to test the new measure. These results were evaluated using standard statistical methods such as factor analysis. To confirm the validity of the new measure, we enrolled a separate sample of 134 autistic children for a detailed assessment by video conference. This step showed that the Pediatric Autism Insomnia Rating Scale is clearly measuring symptoms of insomnia in children with autism spectrum disorder and not related problems such as hyperactivity, repetitive behavior, or anxiety. We also showed that the total score on the Pediatric Autism Insomnia Rating Scale is stable when repeated over a brief period of time. This is important because a measure that is not stable over a brief period of time would not be suitable as an outcome measure. In summary, the Pediatric Autism Insomnia Rating Scale is a brief and valid measure of insomnia in children with autism spectrum disorder that provides reliable scores., Competing Interests: Declaration of Conflicting InterestsDr. Scahill has received royalties from American Psychological Association, Guilford and Oxford University Press and licensing Fees Cogstate, Abbvie, Yamo. Dr. Lecavalier has received licensing Fees Cogstate, Abbvie, Yamo and royalties from Oxford University Press. Dr. Edwards is a partner in Vector Psychometrics. Dr. Cynthia Johnson has received royalties from American Psychological Association and Oxford University Press. All other authors declare no financial interests.